Class: GMP::Z
- Inherits:
-
Integer
- Object
- Integer
- GMP::Z
- Defined in:
- ext/gmpz.c,
ext/gmp.c,
ext/gmpz.c
Overview
GMP Multiple Precision Integer.
Instances of this class can store variables of the type mpz_t. This class also contains many methods that act as the functions for mpz_t variables, as well as a few methods that attempt to make this library more Ruby-ish.
Class Method Summary collapse
-
.2fac ⇒ Object
call-seq: GMP::Z.send(:“2fac”, n) GMP::Z.double_fac(n).
-
.abs ⇒ Object
call-seq: a.abs.
-
.add ⇒ Object
call-seq: GMP::Z.add(rop, op1, op2).
- .addmul ⇒ Object
- .cdiv_q_2exp ⇒ Object
- .cdiv_r_2exp ⇒ Object
-
.com ⇒ Object
call-seq: a.com.
- .congruent? ⇒ Boolean
-
.divexact ⇒ Object
Functional Mappings.
- .divisible? ⇒ Boolean
- .double_fac ⇒ Object
-
.fac ⇒ Object
call-seq: GMP::Z.fac(n).
- .fdiv_q_2exp ⇒ Object
- .fdiv_r_2exp ⇒ Object
-
.fib ⇒ Object
call-seq: GMP::Z.fib(n).
-
.GMP::Z.jacobi(a, b) ⇒ Object
Calculate the Jacobi symbol (a/b).
-
.lcm ⇒ Object
Functional Mappings.
- .lucnum ⇒ Object
-
.mfac ⇒ Object
call-seq: GMP::Z.mfac(n).
- .mul ⇒ Object
- .mul_2exp ⇒ Object
-
.neg ⇒ Object
call-seq: a.neg -a.
-
.new ⇒ Object
Initializing, Assigning Integers.
-
.nextprime ⇒ Object
call-seq: n.nextprime n.next_prime.
-
.pow ⇒ Object
call-seq: GMP::Z.pow(a, b).
-
.primorial ⇒ Object
call-seq: GMP::Z.primorial(n).
-
.sqrt ⇒ Object
call-seq: a.sqrt.
- .sub ⇒ Object
- .submul ⇒ Object
- .tdiv_q_2exp ⇒ Object
- .tdiv_r_2exp ⇒ Object
Instance Method Summary collapse
- #% ⇒ Object
-
#& ⇒ Object
call-seq: a & b.
-
#*(b) ⇒ Object
Multiplies a with b.
-
#** ⇒ Object
call-seq: a ** b.
-
#+(b) ⇒ Object
Adds a to b.
-
#-(b) ⇒ Object
Subtracts b from a.
- #-@ ⇒ Object
-
#/ ⇒ Object
Integer Division.
-
#< ⇒ Object
call-seq: a < b.
-
#<< ⇒ Object
call-seq: a << n.
-
#<= ⇒ Object
call-seq: a <= b.
-
#<=>(b) ⇒ Object
Returns negative if a is less than b.
- #== ⇒ Object
-
#> ⇒ Object
call-seq: a > b.
-
#>= ⇒ Object
call-seq: a >= b.
-
#>> ⇒ Object
unsorted.
-
#[](index) ⇒ Object
Gets the bit at index, returned as either true or false.
-
#[]=(index) ⇒ Object
Sets the bit at index to x.
-
#^ ⇒ Object
call-seq: a ^ b.
-
#abs ⇒ Object
call-seq: a.abs.
-
#abs! ⇒ Object
call-seq: a.abs!.
-
#add!(_b_) ⇒ Object
Adds a to b in-place, setting a to the sum.
-
#addmul!(b, c) ⇒ Object
Sets a to a plus b times c.
-
#cdiv ⇒ Object
call-seq: n.cdiv(d).
-
#cmod ⇒ Object
call-seq: n.cmod(d).
- #cmpabs ⇒ Object
- #coerce(arg) ⇒ Object
-
#com ⇒ Object
call-seq: a.com.
-
#com! ⇒ Object
call-seq: a.com!.
-
#divisible?(b) ⇒ Boolean
Returns true if a is divisible by b.
-
#eql?(b) ⇒ Boolean
Returns true if a is equal to b.
-
#even? ⇒ Boolean
call-seq: a.even?.
-
#fdiv ⇒ Object
call-seq: n.fdiv(d).
-
#fmod ⇒ Object
call-seq: n.fmod(d).
- #gcd ⇒ Object
-
#gcdext(b) ⇒ Object
Returns the greatest common divisor of a and b, in addition to s and t, the coefficients satisfying a*s + b*t = g.
-
#gcdext2(b) ⇒ Object
Returns the greatest common divisor of a and b, in addition to s, the coefficient satisfying a*s + b*t = g.
-
#hamdist(b) ⇒ Object
If a and b are both >= 0 or both < 0, calculate the hamming distance between a and b.
-
#hash ⇒ Object
Returns the computed hash value of a.
- #initialize(*args) ⇒ Object constructor
- #initialize_copy(orig) ⇒ Object
-
#invert(b) ⇒ Object
Returns the inverse of a modulo b.
-
#jacobi(b) ⇒ Object
Calculate the Jacobi symbol (a/b).
- #lastbits_pos ⇒ Object
- #lastbits_sgn ⇒ Object
-
#lcm(b) ⇒ Object
Returns the least common multiple of a and b.
-
#legendre(p) ⇒ Object
Calculate the Legendre symbol (a/p).
-
#neg ⇒ Object
call-seq: a.neg -a.
-
#neg! ⇒ Object
call-seq: a.neg!.
-
#nextprime ⇒ Object
(also: #next_prime)
call-seq: n.nextprime n.next_prime.
-
#nextprime! ⇒ Object
(also: #next_prime!)
call-seq: n.nextprime! n.next_prime!.
-
#odd? ⇒ Boolean
call-seq: a.odd?.
-
#popcount ⇒ Object
call-seq: a.popcount.
-
#power? ⇒ Boolean
call-seq: p.power?.
-
#powmod(b, c) ⇒ Object
Returns a raised to b modulo c.
-
#probab_prime? ⇒ Boolean
Number Theoretic Functions.
-
#remove(f) ⇒ Object
Remove all occurrences of the factor f from n, returning the result as r.
-
#root ⇒ Object
call-seq: a.root(b).
-
#scan0(starting_bit) ⇒ Object
Scan a, starting from bit starting_bit, towards more significant bits, until the first 0 bit is found.
-
#scan1(starting_bit) ⇒ Object
Scan a, starting from bit starting_bit, towards more significant bits, until the first 1 bit is found.
-
#sgn ⇒ Object
Returns +1 if a > 0, 0 if a == 0, and -1 if a < 0.
-
#size ⇒ Object
Return the size of a measured in number of limbs.
-
#size_in_bin ⇒ Object
Return the size of a measured in number of digits in binary.
- #sizeinbase ⇒ Object (also: #size_in_base)
-
#sqrt ⇒ Object
call-seq: a.sqrt.
-
#sqrt! ⇒ Object
call-seq: a.sqrt!.
- #sqrtrem ⇒ Object
-
#square? ⇒ Boolean
call-seq: p.square?.
-
#sub!(b) ⇒ Object
Subtracts b from a in-place, setting a to the difference.
-
#submul!(b, c) ⇒ Object
Sets a to a minus b times c.
-
#swap(b) ⇒ Object
Efficiently swaps the contents of a with b.
-
#tdiv ⇒ Object
call-seq: n.tdiv(d).
-
#tmod ⇒ Object
call-seq: n.tmod(d).
-
#to_d ⇒ Object
Returns a as a Float if a fits in a Float.
-
#to_i ⇒ Object
Returns a as an Fixnum if a fits into a Fixnum.
-
#to_s(*args) ⇒ Object
call-seq: a.to_s(base = 10) a.to_s(:bin) a.to_s(:oct) a.to_s(:dec) a.to_s(:hex).
-
#tshr ⇒ Object
call-seq: n.tshr(d).
-
#| ⇒ Object
call-seq: a | b.
Constructor Details
#initialize(*args) ⇒ Object
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# File 'ext/gmpz.c', line 656
VALUE r_gmpz_initialize(int argc, VALUE *argv, VALUE self)
{
MP_INT *self_val;
int base = 0;
// Set up the base if 2 arguments are passed
if (argc == 2) { // only ok if String, Fixnum
if (STRING_P(argv[0])) { // first arg must be a String
if (FIXNUM_P(argv[1])) { // second arg must be a Fixnum
base = FIX2INT(argv[1]);
if ( base != 0 && ( base < 2 || base > 62) )
rb_raise (rb_eRangeError, "base must be either 0 or between 2 and 62");
} else {
rb_raise (rb_eTypeError, "base must be a Fixnum between 2 and 62, not a %s.", rb_class2name (rb_class_of (argv[1])));
}
} else {
rb_raise(
rb_eTypeError,
"GMP::Z.new() must be passed a String as the 1st argument (not a %s), if a base is passed as the 2nd argument.",
rb_class2name (rb_class_of (argv[0]))
);
}
}
if (argc != 0) {
mpz_get_struct (self,self_val);
mpz_set_value (self_val, argv[0], base);
}
return Qnil;
}
|
Class Method Details
.2fac ⇒ Object
call-seq:
GMP::Z.send(:"2fac", n)
GMP::Z.double_fac(n)
Returns n!!, the double factorial of n.
Examples:
-
GMP::Z.double_fac( 0) #=> 1
-
GMP::Z.double_fac( 1) #=> 1
-
GMP::Z.double_fac( 2) #=> 2
-
GMP::Z.double_fac( 3) #=> 3
-
GMP::Z.double_fac( 4) #=> 8
-
GMP::Z.double_fac( 5) #=> 15
-
GMP::Z.double_fac( 6) #=> 48
-
GMP::Z.double_fac( 7) #=> 105
-
GMP::Z.double_fac( 8) #=> 384
-
GMP::Z.double_fac( 9) #=> 945
-
GMP::Z.double_fac( 10) #=> 3840
-
GMP::Z.double_fac(100)
#=> 34243224702511976248246432895208185975118675053719198827915654463488000000000000
.abs ⇒ Object
call-seq:
a.abs
Returns the absolute value of a.
.addmul ⇒ Object
.cdiv_q_2exp ⇒ Object
.cdiv_r_2exp ⇒ Object
.com ⇒ Object
call-seq:
a.com
Returns the one’s complement of a.
.congruent? ⇒ Boolean
.divexact ⇒ Object
Functional Mappings
.divisible? ⇒ Boolean
.double_fac ⇒ Object
.fac ⇒ Object
.fdiv_q_2exp ⇒ Object
.fdiv_r_2exp ⇒ Object
.fib ⇒ Object
.GMP::Z.jacobi(a, b) ⇒ Object
Calculate the Jacobi symbol (a/b). This is defined only for b odd and positive.
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# File 'ext/gmpz.c', line 2008
VALUE r_gmpzsg_jacobi(VALUE klass, VALUE a, VALUE b)
{
MP_INT *a_val, *b_val;
int res_val;
int free_a_val = 0;
int free_b_val = 0;
(void)klass;
if (GMPZ_P(a)) {
mpz_get_struct(a, a_val);
} else if (FIXNUM_P(a)) {
mpz_temp_alloc(a_val);
mpz_init_set_ui(a_val, FIX2NUM(a));
free_a_val = 1;
} else if (BIGNUM_P(a)) {
mpz_temp_from_bignum(a_val, a);
free_a_val = 1;
} else {
typeerror_as(ZXB, "a");
}
if (GMPZ_P(b)) {
mpz_get_struct(b, b_val);
if (mpz_sgn(b_val) != 1)
rb_raise(rb_eRangeError, "Cannot take Jacobi symbol (a/b) where b is non-positive.");
if (mpz_even_p(b_val))
rb_raise(rb_eRangeError, "Cannot take Jacobi symbol (a/b) where b is even.");
} else if (FIXNUM_P(b)) {
if (FIX2NUM(b) <= 0)
rb_raise(rb_eRangeError, "Cannot take Jacobi symbol (a/b) where b is non-positive.");
if (FIX2NUM(b) % 2 == 0)
rb_raise(rb_eRangeError, "Cannot take Jacobi symbol (a/b) where b is even.");
mpz_temp_alloc(b_val);
mpz_init_set_ui(b_val, FIX2NUM(b));
free_b_val = 1;
} else if (BIGNUM_P(b)) {
mpz_temp_from_bignum(b_val, b);
if (mpz_sgn(b_val) != 1) {
mpz_temp_free(b_val);
rb_raise(rb_eRangeError, "Cannot take Jacobi symbol (a/b) where b is non-positive.");
}
if (mpz_even_p(b_val)) {
mpz_temp_free(b_val);
rb_raise(rb_eRangeError, "Cannot take Jacobi symbol (a/b) where b is even.");
}
free_b_val = 1;
} else {
typeerror_as(ZXB, "b");
}
res_val = mpz_jacobi(a_val, b_val);
if (free_a_val) { mpz_temp_free(a_val); }
if (free_b_val) { mpz_temp_free(b_val); }
return INT2FIX(res_val);
}
|
.lcm ⇒ Object
Functional Mappings
.lucnum ⇒ Object
.mfac ⇒ Object
call-seq:
GMP::Z.mfac(n)
Returns n!^(m), the m-multi-factorial of n.
Examples:
-
GMP::Z.mfac(0, 3) #=> 1
-
GMP::Z.mfac(1, 3) #=> 1
-
GMP::Z.mfac(2, 3) #=> 2
-
GMP::Z.mfac(3, 3) #=> 3
-
GMP::Z.mfac(4, 3) #=> 4
-
GMP::Z.mfac(5, 3) #=> 10
-
GMP::Z.mfac(6, 3) #=> 18
-
GMP::Z.mfac(7, 3) #=> 28
-
GMP::Z.mfac(8, 3) #=> 80
-
GMP::Z.mfac(9, 3) #=> 162
-
GMP::Z.mfac(10, 3) #=> 280
-
GMP::Z.mfac(11, 3) #=> 880
-
GMP::Z.mfac(12, 3) #=> 1944
.mul ⇒ Object
.mul_2exp ⇒ Object
.neg ⇒ Object
call-seq:
a.neg
-a
Returns -a.
.new ⇒ Object
Initializing, Assigning Integers
.nextprime ⇒ Object
call-seq:
n.nextprime
n.next_prime
Returns the next prime greater than n.
This function uses a probabilistic algorithm to identify primes. For practical purposes it’s adequate, the chance of a composite passing will be extremely small.
.primorial ⇒ Object
.sqrt ⇒ Object
call-seq:
a.sqrt
Returns the truncated integer part of the square root of a.
.sub ⇒ Object
.submul ⇒ Object
.tdiv_q_2exp ⇒ Object
.tdiv_r_2exp ⇒ Object
Instance Method Details
#% ⇒ Object
#& ⇒ Object
call-seq:
a & b
Returns a bitwise-and b. b must be an instance of one of the following:
-
GMP::Z
-
Fixnum
-
Bignum
#*(b) ⇒ Object
Multiplies a with b. a must be an instance of one of
-
GMP::Z
-
Fixnum
-
GMP::Q
-
GMP::F
-
Bignum
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# File 'ext/gmpz.c', line 1080
VALUE r_gmpz_mul(VALUE self, VALUE arg)
{
MP_INT *self_val, *arg_val, *res_val;
VALUE res;
mpz_get_struct(self,self_val);
if (GMPZ_P(arg)) {
mpz_make_struct_init(res, res_val);
mpz_get_struct(arg,arg_val);
mpz_mul(res_val, self_val, arg_val);
} else if (FIXNUM_P(arg)) {
mpz_make_struct_init(res, res_val);
mpz_mul_si(res_val, self_val, FIX2NUM(arg));
} else if (GMPQ_P(arg)) {
return r_gmpq_mul(arg, self);
} else if (GMPF_P(arg)) {
#ifndef MPFR
return r_gmpf_mul(arg, self);
#else
return rb_funcall(arg, rb_intern("*"), 1, self);
#endif
} else if (BIGNUM_P(arg)) {
mpz_make_struct_init(res, res_val);
mpz_set_bignum(res_val, arg);
mpz_mul(res_val, res_val, self_val);
} else {
typeerror(ZQFXB);
}
return res;
}
|
#** ⇒ Object
call-seq:
a ** b
Returns a raised to b. The case 0^0 yields 1.
#+(b) ⇒ Object
Adds a to b. b must be an instance of one of:
-
GMP::Z
-
Fixnum
-
GMP::Q
-
GMP::F
-
Bignum
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# File 'ext/gmpz.c', line 910
VALUE r_gmpz_add(VALUE self, VALUE arg)
{
MP_INT *self_val, *arg_val, *res_val;
VALUE res;
mpz_get_struct(self,self_val);
if (GMPZ_P(arg)) {
mpz_get_struct(arg,arg_val);
mpz_make_struct_init(res, res_val);
mpz_add(res_val, self_val, arg_val);
} else if (FIXNUM_P(arg)) {
mpz_make_struct_init(res, res_val);
if (FIX2NUM(arg) > 0)
mpz_add_ui(res_val, self_val, FIX2NUM(arg));
else
mpz_sub_ui(res_val, self_val, -FIX2NUM(arg));
} else if (GMPQ_P(arg)) {
return r_gmpq_add(arg, self);
} else if (GMPF_P(arg)) {
#ifndef MPFR
return r_gmpf_add(arg, self);
#else
return rb_funcall(arg, rb_intern("+"), 1, self);
#endif
} else if (BIGNUM_P(arg)) {
mpz_make_struct_init(res, res_val);
mpz_init(res_val);
mpz_set_bignum(res_val, arg);
mpz_add(res_val, res_val, self_val);
} else {
typeerror(ZQFXB);
}
return res;
}
|
#-(b) ⇒ Object
Subtracts b from a. b must be an instance of one of:
-
GMP::Z
-
Fixnum
-
GMP::Q
-
GMP::F
-
Bignum
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# File 'ext/gmpz.c', line 992
VALUE r_gmpz_sub(VALUE self, VALUE arg)
{
MP_RAT *res_val_q, *arg_val_q;
MP_INT *self_val, *arg_val, *res_val;
MP_FLOAT *arg_val_f, *res_val_f;
VALUE res;
unsigned long prec;
mpz_get_struct(self,self_val);
if (GMPZ_P(arg)) {
mpz_make_struct_init(res, res_val);
mpz_get_struct(arg,arg_val);
mpz_sub (res_val, self_val, arg_val);
} else if (FIXNUM_P(arg)) {
mpz_make_struct_init(res, res_val);
if (FIX2NUM(arg) > 0)
mpz_sub_ui (res_val, self_val, FIX2NUM(arg));
else
mpz_add_ui (res_val, self_val, -FIX2NUM(arg));
} else if (GMPQ_P(arg)) {
mpq_make_struct_init(res, res_val_q);
mpq_get_struct(arg,arg_val_q);
mpz_set (mpq_denref(res_val_q), mpq_denref(arg_val_q));
mpz_mul (mpq_numref(res_val_q), mpq_denref(arg_val_q), self_val);
mpz_sub (mpq_numref(res_val_q), mpq_numref(res_val_q), mpq_numref(arg_val_q));
} else if (GMPF_P(arg)) {
mpf_get_struct_prec (arg, arg_val_f, prec);
mpf_make_struct_init(res, res_val_f, prec);
mpf_set_z (res_val_f, self_val);
mpf_sub (res_val_f, res_val_f, arg_val_f);
} else if (BIGNUM_P(arg)) {
mpz_make_struct_init(res, res_val);
mpz_set_bignum (res_val, arg);
mpz_sub (res_val, self_val, res_val);
} else {
typeerror (ZQFXB);
}
return res;
}
|
#-@ ⇒ Object
#/ ⇒ Object
Integer Division
#< ⇒ Object
call-seq:
a < b
Returns whether a is strictly less than b.
#<< ⇒ Object
call-seq:
a << n
Returns a times 2 raised to n. This operation can also be defined as a left shift by n bits.
#<= ⇒ Object
call-seq:
a <= b
Returns whether a is less than or equal to b.
#<=>(b) ⇒ Object
Returns negative if a is less than b.
Returns 0 if a is equal to b.
Returns positive if a is greater than b.
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# File 'ext/gmpz.c', line 2327
VALUE r_gmpz_cmp(VALUE self, VALUE arg)
{
MP_INT *self_val;
int res;
mpz_get_struct(self,self_val);
res = mpz_cmp_value(self_val, arg);
if (res > 0)
return INT2FIX(1);
else if (res == 0)
return INT2FIX(0);
else
return INT2FIX(-1);
}
|
#== ⇒ Object
#> ⇒ Object
call-seq:
a > b
Returns whether a is strictly greater than b.
#>= ⇒ Object
call-seq:
a >= b
Returns whether a is greater than or equal to b.
#>> ⇒ Object
unsorted
#[](index) ⇒ Object
Gets the bit at index, returned as either true or false.
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# File 'ext/gmpz.c', line 2664
VALUE r_gmpz_getbit(VALUE self, VALUE bitnr)
{
MP_INT *self_val;
unsigned long bitnr_val;
mpz_get_struct(self, self_val);
if (FIXNUM_P(bitnr)) {
bitnr_val = FIX2NUM (bitnr);
} else {
typeerror_as(X, "index");
}
return mpz_tstbit(self_val, bitnr_val)?Qtrue:Qfalse;
}
|
#[]=(index) ⇒ Object
Sets the bit at index to x.
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# File 'ext/gmpz.c', line 2635
VALUE r_gmpz_setbit(VALUE self, VALUE bitnr, VALUE set_to)
{
MP_INT *self_val;
unsigned long bitnr_val;
mpz_get_struct (self, self_val);
if (FIXNUM_P (bitnr)) {
if (FIX2NUM (bitnr) < 0) {
rb_raise(rb_eRangeError, "index must be nonnegative");
}
bitnr_val = FIX2NUM (bitnr);
} else {
typeerror_as (X, "index");
}
if (RTEST (set_to)) {
mpz_setbit (self_val, bitnr_val);
} else {
mpz_clrbit (self_val, bitnr_val);
}
return Qnil;
}
|
#^ ⇒ Object
call-seq:
a ^ b
Returns a bitwise exclusive-or b. b must be an instance of one of the following:
-
GMP::Z
-
Fixnum
-
Bignum
#abs ⇒ Object
call-seq:
a.abs
Returns the absolute value of a.
#abs! ⇒ Object
call-seq:
a.abs!
Sets a to its absolute value.
#add!(_b_) ⇒ Object
Adds a to b in-place, setting a to the sum. b must be an instance of one of:
-
GMP::Z
-
Fixnum
-
GMP::Q
-
GMP::F
-
Bignum
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# File 'ext/gmpz.c', line 957
VALUE r_gmpz_add_self(VALUE self, VALUE arg)
{
MP_INT *self_val, *arg_val;
mpz_get_struct(self,self_val);
if (GMPZ_P(arg)) {
mpz_get_struct(arg,arg_val);
mpz_add(self_val, self_val, arg_val);
} else if (FIXNUM_P(arg)) {
if (FIX2NUM(arg) > 0)
mpz_add_ui(self_val, self_val, FIX2NUM(arg));
else
mpz_sub_ui(self_val, self_val, -FIX2NUM(arg));
} else if (BIGNUM_P(arg)) {
mpz_temp_from_bignum(arg_val, arg);
mpz_add(self_val, self_val, arg_val);
mpz_temp_free(arg_val);
} else {
typeerror(ZXB);
}
return Qnil;
}
|
#addmul!(b, c) ⇒ Object
Sets a to a plus b times c. b and c must each be an instance of one of
-
GMP::Z
-
Fixnum
-
Bignum
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# File 'ext/gmpz.c', line 1123
static VALUE r_gmpz_addmul_self(VALUE self, VALUE b, VALUE c)
{
MP_INT *self_val, *b_val, *c_val;
int free_b_val = 0;
if (GMPZ_P(b)) {
mpz_get_struct(b, b_val);
} else if (FIXNUM_P(b)) {
mpz_temp_alloc(b_val);
mpz_init_set_si(b_val, FIX2NUM(b));
free_b_val = 1;
} else if (BIGNUM_P(b)) {
mpz_temp_from_bignum(b_val, b);
free_b_val = 1;
} else {
typeerror_as(ZXB, "addend");
}
mpz_get_struct(self, self_val);
if (GMPZ_P(c)) {
mpz_get_struct(c, c_val);
mpz_addmul(self_val, b_val, c_val);
} else if (FIXNUM_P(c)) {
if (FIX2NUM(c) < 0)
{
if (free_b_val) { mpz_temp_free(b_val); }
rb_raise(rb_eRangeError, "multiplicand (Fixnum) must be nonnegative");
}
mpz_addmul_ui(self_val, b_val, FIX2NUM(c));
} else if (BIGNUM_P(c)) {
mpz_temp_from_bignum(c_val, c);
mpz_addmul(self_val, b_val, c_val);
mpz_temp_free(c_val);
} else {
if (free_b_val)
mpz_temp_free(b_val);
typeerror_as(ZXB, "multiplicand");
}
if (free_b_val)
mpz_temp_free(b_val);
return self;
}
|
#cdiv ⇒ Object
call-seq:
n.cdiv(d)
Divide n by d, forming a quotient q. cdiv rounds q up towards _+infinity_. The c stands for “ceil”.
q will satisfy n=q*d+r.
This function calculates only the quotient.
#cmod ⇒ Object
call-seq:
n.cmod(d)
Divides n by d, forming a remainder r. r will have the opposite sign of d. The c stands for “ceil”.
r will satisfy n=q*d+r, and r will satisfy 0 <= abs( r ) < abs( d ).
This function calculates only the remainder.
#cmpabs ⇒ Object
#coerce(arg) ⇒ Object
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# File 'ext/gmp.c', line 23
static VALUE r_gmpz_coerce(VALUE self, VALUE arg)
{
return rb_assoc_new(r_gmpzsg_new(1, &arg, cGMP_Z), self);
}
|
#com ⇒ Object
call-seq:
a.com
Returns the one’s complement of a.
#com! ⇒ Object
call-seq:
a.com!
Sets a to its one’s complement.
#divisible?(b) ⇒ Boolean
Returns true if a is divisible by b. b can be an instance any of the following:
-
GMP::Z
-
Fixnum
-
Bignum
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# File 'ext/gmpz.c', line 1499
static VALUE r_gmpz_divisible(VALUE self, VALUE arg)
{
MP_INT *self_val, *arg_val;
int res;
mpz_get_struct (self, self_val);
if (FIXNUM_P (arg) && FIX2NUM (arg) > 0) {
mpz_temp_alloc(arg_val);
mpz_init_set_ui(arg_val, FIX2NUM(arg));
res = mpz_divisible_ui_p (self_val, FIX2NUM (arg));
mpz_temp_free(arg_val);
} else if (FIXNUM_P (arg)) {
mpz_temp_alloc(arg_val);
mpz_make_struct_init (arg, arg_val);
mpz_init_set_si(arg_val, FIX2NUM(arg));
res = mpz_divisible_p (self_val, arg_val);
mpz_temp_free(arg_val);
} else if (BIGNUM_P (arg)) {
mpz_temp_from_bignum(arg_val, arg);
res = mpz_divisible_p (self_val, arg_val);
mpz_temp_free(arg_val);
} else if (GMPZ_P (arg)) {
mpz_get_struct(arg, arg_val);
res = mpz_divisible_p (self_val, arg_val);
} else {
typeerror_as (ZXB, "argument");
}
return (res != 0) ? Qtrue : Qfalse;
}
|
#eql?(b) ⇒ Boolean
Returns true if a is equal to b. a and b must then be equal in cardinality, and both be instances of GMP::Z. Otherwise, returns false. a.eql?(b) if and only if b.class == GMP::Z, and a.hash == b.hash.
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# File 'ext/gmpz.c', line 2447
VALUE r_gmpz_eql(VALUE self, VALUE arg)
{
MP_INT *self_val, *arg_val;
mpz_get_struct(self,self_val);
if (GMPZ_P(arg)) {
mpz_get_struct(arg, arg_val);
return (mpz_cmp (self_val, arg_val) == 0) ? Qtrue : Qfalse;
}
else {
return Qfalse;
}
}
|
#even? ⇒ Boolean
call-seq:
a.even?
Determines whether a is even. Returns true or false.
#fdiv ⇒ Object
call-seq:
n.fdiv(d)
Divide n by d, forming a quotient q. fdiv rounds q down towards -infinity. The f stands for “floor”.
q will satisfy n=q*d+r.
This function calculates only the quotient.
#fmod ⇒ Object
call-seq:
n.fmod(d)
Divides n by d, forming a remainder r. r will have the same sign as d. The f stands for “floor”.
r will satisfy n=q*d+r, and r will satisfy 0 <= abs( r ) < abs( d ).
This function calculates only the remainder.
The remainder can be negative, so the return value is the absolute value of the remainder.
#gcd ⇒ Object
#gcdext(b) ⇒ Object
Returns the greatest common divisor of a and b, in addition to s and t, the coefficients satisfying a*s + b*t = g. g is always positive, even if one or both of a and b are negative. s and t are chosen such that abs(s) <= abs(b) and abs(t) <= abs(a).
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# File 'ext/gmpz.c', line 1825
VALUE r_gmpz_gcdext(VALUE self, VALUE arg)
{
MP_INT *self_val, *arg_val, *res_val, *s_val, *t_val;
VALUE res, s, t, ary;
int free_arg_val = 0;
mpz_get_struct (self,self_val);
if (GMPZ_P (arg)) {
mpz_make_struct_init (res, res_val);
mpz_make_struct_init (s, s_val);
mpz_make_struct_init (t, t_val);
mpz_get_struct (arg, arg_val);
mpz_gcdext (res_val, s_val, t_val, self_val, arg_val);
} else if (FIXNUM_P (arg)) {
mpz_make_struct_init (res, res_val);
mpz_make_struct_init (s, s_val);
mpz_make_struct_init (t, t_val);
mpz_temp_alloc (arg_val);
mpz_init_set_ui (arg_val, FIX2NUM(arg));
free_arg_val = 1;
mpz_gcdext (res_val, s_val, t_val, self_val, arg_val);
} else if (BIGNUM_P (arg)) {
mpz_make_struct_init (res, res_val);
mpz_make_struct_init (s, s_val);
mpz_make_struct_init (t, t_val);
mpz_set_bignum (res_val, arg);
mpz_gcdext (res_val, s_val, t_val, res_val, self_val);
} else {
typeerror (ZXB);
}
if (free_arg_val)
mpz_temp_free (arg_val);
ary = rb_ary_new3 (3, res, s, t);
return ary;
}
|
#gcdext2(b) ⇒ Object
Returns the greatest common divisor of a and b, in addition to s, the coefficient satisfying a*s + b*t = g. g is always positive, even if one or both of a and b are negative. s and t are chosen such that abs(s) <= abs(b) and abs(t) <= abs(a).
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# File 'ext/gmpz.c', line 1875
VALUE r_gmpz_gcdext2(VALUE self, VALUE arg)
{
MP_INT *self_val, *arg_val, *res_val, *s_val;
VALUE res, s, ary;
int free_arg_val = 0;
mpz_get_struct (self,self_val);
if (GMPZ_P (arg)) {
mpz_make_struct_init (res, res_val);
mpz_make_struct_init (s, s_val);
mpz_get_struct (arg, arg_val);
mpz_gcdext (res_val, s_val, NULL, self_val, arg_val);
} else if (FIXNUM_P (arg)) {
mpz_make_struct_init (res, res_val);
mpz_make_struct_init (s, s_val);
mpz_temp_alloc (arg_val);
mpz_init_set_ui (arg_val, FIX2NUM(arg));
free_arg_val = 1;
mpz_gcdext (res_val, s_val, NULL, self_val, arg_val);
} else if (BIGNUM_P (arg)) {
mpz_make_struct_init (res, res_val);
mpz_make_struct_init (s, s_val);
mpz_set_bignum (res_val, arg);
mpz_gcdext (res_val, s_val, NULL, res_val, self_val);
} else {
typeerror (ZXB);
}
if (free_arg_val)
mpz_temp_free (arg_val);
ary = rb_ary_new3 (2, res, s);
return ary;
}
|
#hamdist(b) ⇒ Object
If a and b are both >= 0 or both < 0, calculate the hamming distance between a and b. If one operand is >= 0 and the other is less than 0, then return “infinity” (the largest possible ‘mp_bitcnt_t`. positive.
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# File 'ext/gmpz.c', line 2562
VALUE r_gmpz_hamdist(VALUE self_val, VALUE b_val)
{
MP_INT *self, *b;
mpz_get_struct (self_val, self);
mpz_get_struct ( b_val, b);
if (! GMPZ_P (b_val)) {
typeerror_as (Z, "b");
}
return INT2FIX (mpz_hamdist(self, b));
}
|
#hash ⇒ Object
Returns the computed hash value of a. This method first converts a into a String (base 10), then calls String#hash on the result, returning the hash value. a.eql?(b) if and only if b.class == GMP::Z, and a.hash == b.hash.
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# File 'ext/gmpz.c', line 2471
VALUE r_gmpz_hash(VALUE self)
{
ID to_s_sym = rb_intern("to_s");
ID hash_sym = rb_intern("hash");
return rb_funcall(rb_funcall(self, to_s_sym, 0), hash_sym, 0);
}
|
#initialize_copy(orig) ⇒ Object
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# File 'ext/gmpz.c', line 687
static VALUE r_gmpz_initialize_copy(VALUE copy, VALUE orig) {
MP_INT *orig_z, *copy_z;
if (copy == orig) return copy;
if (TYPE(orig) != T_DATA) {
rb_raise(rb_eTypeError, "wrong argument type");
}
mpz_get_struct (orig, orig_z);
mpz_get_struct (copy, copy_z);
mpz_set (copy_z, orig_z);
return copy;
}
|
#invert(b) ⇒ Object
Returns the inverse of a modulo b. If the inverse exists, the return value is non-zero and the result will be non-negative and less than b. If an inverse doesn’t exist, the result is undefined.
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# File 'ext/gmpz.c', line 1954
VALUE r_gmpz_invert(VALUE self, VALUE arg)
{
MP_INT *self_val, *arg_val, *res_val;
VALUE res;
mpz_get_struct (self,self_val);
if (GMPZ_P (arg)) {
mpz_make_struct_init (res, res_val);
mpz_get_struct (arg, arg_val);
mpz_invert (res_val, self_val, arg_val);
} else if (FIXNUM_P (arg)) {
mpz_temp_alloc(arg_val);
mpz_init_set_ui(arg_val, FIX2NUM(arg));
mpz_make_struct_init (res, res_val);
mpz_invert (res_val, self_val, arg_val);
} else if (BIGNUM_P (arg)) {
mpz_make_struct_init (res, res_val);
mpz_set_bignum (res_val, arg);
mpz_invert (res_val, res_val, self_val);
} else {
typeerror (ZXB);
}
return res;
}
|
#jacobi(b) ⇒ Object
Calculate the Jacobi symbol (a/b). This is defined only for b odd and positive.
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# File 'ext/gmpz.c', line 1987
VALUE r_gmpz_jacobi(VALUE self, VALUE b)
{
MP_INT *self_val, *b_val;
int res_val;
mpz_get_struct(self, self_val);
mpz_get_struct( b, b_val);
if (mpz_sgn(b_val) != 1)
rb_raise(rb_eRangeError, "Cannot take Jacobi symbol (a/b) where b is non-positive.");
if (mpz_even_p(b_val))
rb_raise(rb_eRangeError, "Cannot take Jacobi symbol (a/b) where b is even.");
res_val = mpz_jacobi(self_val, b_val);
return INT2FIX(res_val);
}
|
#lastbits_pos ⇒ Object
#lastbits_sgn ⇒ Object
#lcm(b) ⇒ Object
Returns the least common multiple of a and b. The result is always positive even if one or both of a or b are negative.
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# File 'ext/gmpz.c', line 1920
VALUE r_gmpz_lcm(VALUE self, VALUE arg)
{
MP_INT *self_val, *arg_val, *res_val;
VALUE res;
mpz_get_struct (self,self_val);
if (GMPZ_P (arg)) {
mpz_make_struct_init (res, res_val);
mpz_get_struct (arg, arg_val);
mpz_lcm (res_val, self_val, arg_val);
} else if (FIXNUM_P (arg)) {
mpz_make_struct_init (res, res_val);
mpz_lcm_ui (res_val, self_val, FIX2NUM(arg));
} else if (BIGNUM_P (arg)) {
mpz_make_struct_init (res, res_val);
mpz_set_bignum (res_val, arg);
mpz_lcm (res_val, res_val, self_val);
} else {
typeerror (ZXB);
}
return res;
}
|
#legendre(p) ⇒ Object
Calculate the Legendre symbol (a/p). This is defined only for p an odd positive prime, and for such p it’s identical to the Jacobi symbol.
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# File 'ext/gmpz.c', line 2071
VALUE r_gmpz_legendre(VALUE self, VALUE p)
{
MP_INT *self_val, *p_val;
int res_val;
mpz_get_struct(self, self_val);
mpz_get_struct( p, p_val);
if (mpz_sgn(p_val) != 1)
rb_raise(rb_eRangeError, "Cannot take Legendre symbol (a/p) where p is non-positive.");
if (mpz_even_p(p_val))
rb_raise(rb_eRangeError, "Cannot take Legendre symbol (a/p) where p is even.");
if (mpz_probab_prime_p(p_val, 5) == 0)
rb_raise(rb_eRangeError, "Cannot take Legendre symbol (a/p) where p is composite.");
res_val = mpz_legendre(self_val, p_val);
return INT2FIX(res_val);
}
|
#neg ⇒ Object
call-seq:
a.neg
-a
Returns -a.
#neg! ⇒ Object
call-seq:
a.neg!
Sets a to -a.
#nextprime ⇒ Object Also known as: next_prime
call-seq:
n.nextprime
n.next_prime
Returns the next prime greater than n.
This function uses a probabilistic algorithm to identify primes. For practical purposes it’s adequate, the chance of a composite passing will be extremely small.
#nextprime! ⇒ Object Also known as: next_prime!
call-seq:
n.nextprime!
n.next_prime!
Sets n to the next prime greater than n.
This function uses a probabilistic algorithm to identify primes. For practical purposes it’s adequate, the chance of a composite passing will be extremely small.
#odd? ⇒ Boolean
call-seq:
a.odd?
Determines whether a is odd. Returns true or false.
#popcount ⇒ Object
call-seq:
a.popcount
If a >= 0, return the population count of a, which is the number of 1 bits in the binary representation. If a < 0, the number of 1s is infinite, and the return value is INT2FIX(ULONG_MAX), the largest possible unsigned long.
#power? ⇒ Boolean
call-seq:
p.power?
Returns true if p is a perfect power, i.e., if there exist integers a and b, with b > 1, such that p equals a raised to the power b.
Under this definition both 0 and 1 are considered to be perfect powers. Negative values of integers are accepted, but of course can only be odd perfect powers.
#powmod(b, c) ⇒ Object
Returns a raised to b modulo c.
Negative b is supported if an inverse a^-1 mod c exists. If an inverse doesn’t exist then a divide by zero is raised.
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# File 'ext/gmpz.c', line 1579
VALUE r_gmpz_powm(VALUE self, VALUE exp, VALUE mod)
{
MP_INT *self_val, *res_val, *mod_val, *exp_val;
VALUE res;
int free_mod_val = 0;
if (GMPZ_P(mod)) {
mpz_get_struct(mod, mod_val);
if (mpz_sgn(mod_val) <= 0) {
rb_raise(rb_eRangeError, "modulus must be positive");
}
} else if (FIXNUM_P(mod)) {
if (FIX2NUM(mod) <= 0) {
rb_raise(rb_eRangeError, "modulus must be positive");
}
mpz_temp_alloc(mod_val);
mpz_init_set_ui(mod_val, FIX2NUM(mod));
free_mod_val = 1;
} else if (BIGNUM_P(mod)) {
mpz_temp_from_bignum(mod_val, mod);
if (mpz_sgn(mod_val) <= 0) {
mpz_temp_free(mod_val);
rb_raise(rb_eRangeError, "modulus must be positive");
}
free_mod_val = 1;
} else {
typeerror_as(ZXB, "modulus");
}
mpz_make_struct_init(res, res_val);
mpz_get_struct(self, self_val);
if (GMPZ_P(exp)) {
mpz_get_struct(exp, exp_val);
if (mpz_sgn(mod_val) < 0) {
rb_raise(rb_eRangeError, "exponent must be nonnegative");
}
mpz_powm(res_val, self_val, exp_val, mod_val);
} else if (FIXNUM_P(exp)) {
if (FIX2NUM(exp) < 0)
{
if (free_mod_val)
mpz_temp_free(mod_val);
rb_raise(rb_eRangeError, "exponent must be nonnegative");
}
mpz_powm_ui(res_val, self_val, FIX2NUM(exp), mod_val);
} else if (BIGNUM_P(exp)) {
mpz_temp_from_bignum(exp_val, exp);
mpz_powm(res_val, self_val, exp_val, mod_val);
mpz_temp_free(exp_val);
} else {
if (free_mod_val)
mpz_temp_free(mod_val);
typeerror_as(ZXB, "exponent");
}
if (free_mod_val)
mpz_temp_free(mod_val);
return res;
}
|
#probab_prime? ⇒ Boolean
Number Theoretic Functions
#remove(f) ⇒ Object
Remove all occurrences of the factor f from n, returning the result as r. t, how many such occurrences were removed, is also returned.
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# File 'ext/gmpz.c', line 2094
VALUE r_gmpz_remove(VALUE self, VALUE arg)
{
MP_INT *self_val, *arg_val, *res_val;
VALUE res;
#if __GNU_MP_VERSION>2
unsigned long removed_val;
#else
int removed_val;
#endif
int free_arg_val = 0;
mpz_get_struct(self, self_val);
if (GMPZ_P(arg)) {
mpz_get_struct(arg,arg_val);
if (mpz_sgn(arg_val) != 1)
rb_raise(rb_eRangeError, "argument must be positive");
} else if (FIXNUM_P(arg)) {
if (FIX2NUM(arg) <= 0)
rb_raise(rb_eRangeError, "argument must be positive");
mpz_temp_alloc(arg_val);
mpz_init_set_ui(arg_val, FIX2NUM(arg));
} else if (BIGNUM_P(arg)) {
mpz_temp_from_bignum(arg_val, arg);
if (mpz_sgn(arg_val) != 1) {
mpz_temp_free(arg_val);
rb_raise(rb_eRangeError, "argument must be positive");
}
} else {
typeerror(ZXB);
}
mpz_make_struct_init(res, res_val);
removed_val = mpz_remove(res_val, self_val, arg_val);
if (free_arg_val)
mpz_temp_free(arg_val);
return rb_assoc_new(res, INT2FIX(removed_val));
}
|
#root ⇒ Object
call-seq:
a.root(b)
Returns the truncated integer part of the bth root of a.
#scan0(starting_bit) ⇒ Object
Scan a, starting from bit starting_bit, towards more significant bits, until the first 0 bit is found. Return the index of the found bit.
If the bit at starting_bit is already what’s sought, then starting_bit is returned.
If there’s no bit found, then INT2FIX(ULONG_MAX) is returned. This will happen in scan0 past the end of a negative number.
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# File 'ext/gmpz.c', line 2587
VALUE r_gmpz_scan0(VALUE self, VALUE bitnr)
{
MP_INT *self_val;
int bitnr_val;
mpz_get_struct (self, self_val);
if (FIXNUM_P (bitnr)) {
bitnr_val = FIX2INT (bitnr);
} else {
typeerror_as (X, "index");
}
return INT2FIX (mpz_scan0 (self_val, bitnr_val));
}
|
#scan1(starting_bit) ⇒ Object
Scan a, starting from bit starting_bit, towards more significant bits, until the first 1 bit is found. Return the index of the found bit.
If the bit at starting_bit is already what’s sought, then starting_bit is returned.
If there’s no bit found, then INT2FIX(ULONG_MAX) is returned. This will happen in scan1 past the end of a nonnegative number.
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# File 'ext/gmpz.c', line 2613
VALUE r_gmpz_scan1(VALUE self, VALUE bitnr)
{
MP_INT *self_val;
int bitnr_val;
mpz_get_struct (self, self_val);
if (FIXNUM_P (bitnr)) {
bitnr_val = FIX2INT (bitnr);
} else {
typeerror_as (X, "index");
}
return INT2FIX (mpz_scan1 (self_val, bitnr_val));
}
|
#sgn ⇒ Object
Returns +1 if a > 0, 0 if a == 0, and -1 if a < 0.
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# File 'ext/gmpz.c', line 2430
VALUE r_gmpz_sgn(VALUE self)
{
MP_INT *self_val;
mpz_get_struct(self, self_val);
return INT2FIX(mpz_sgn(self_val));
}
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#size ⇒ Object
Return the size of a measured in number of limbs. If a is zero, the returned value will be zero.
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# File 'ext/gmpz.c', line 2752
VALUE r_gmpz_size(VALUE self)
{
MP_INT *self_val;
mpz_get_struct(self, self_val);
return INT2FIX(mpz_size(self_val));
}
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#size_in_bin ⇒ Object
Return the size of a measured in number of digits in binary. The sign of a is ignored, just the absolute value is used. If a is zero the return value is 1.
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# File 'ext/gmpz.c', line 2731
VALUE r_gmpz_size_in_bin(VALUE self)
{
MP_INT *self_val;
mpz_get_struct (self, self_val);
return INT2FIX (mpz_sizeinbase (self_val, 2));
}
|
#sizeinbase ⇒ Object Also known as: size_in_base
#sqrt ⇒ Object
call-seq:
a.sqrt
Returns the truncated integer part of the square root of a.
#sqrt! ⇒ Object
call-seq:
a.sqrt!
Sets a to the truncated integer part of its square root.
#sqrtrem ⇒ Object
#square? ⇒ Boolean
call-seq:
p.square?
Returns true if p is a perfect square, i.e., if the square root of p is an integer. Under this definition both 0 and 1 are considered to be perfect squares.
#sub!(b) ⇒ Object
Subtracts b from a in-place, setting a to the difference. b must be an instance of one of:
-
GMP::Z
-
Fixnum
-
GMP::Q
-
GMP::F
-
Bignum
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# File 'ext/gmpz.c', line 1045
VALUE r_gmpz_sub_self(VALUE self, VALUE arg)
{
MP_INT *self_val, *arg_val;
mpz_get_struct(self,self_val);
if (GMPZ_P(arg)) {
mpz_get_struct(arg, arg_val);
mpz_sub (self_val, self_val, arg_val);
} else if (FIXNUM_P(arg)) {
if (FIX2NUM(arg) > 0)
mpz_sub_ui (self_val, self_val, FIX2NUM(arg));
else
mpz_add_ui (self_val, self_val, -FIX2NUM(arg));
} else if (BIGNUM_P(arg)) {
mpz_temp_from_bignum(arg_val, arg);
mpz_sub (self_val, self_val, arg_val);
mpz_temp_free (arg_val);
} else {
typeerror (ZXB);
}
return Qnil;
}
|
#submul!(b, c) ⇒ Object
Sets a to a minus b times c. b and c must each be an instance of one of
-
GMP::Z
-
Fixnum
-
Bignum
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# File 'ext/gmpz.c', line 1177
static VALUE r_gmpz_submul_self(VALUE self, VALUE b, VALUE c)
{
MP_INT *self_val, *b_val, *c_val;
int free_b_val = 0;
if (GMPZ_P(b)) {
mpz_get_struct(b, b_val);
} else if (FIXNUM_P(b)) {
mpz_temp_alloc(b_val);
mpz_init_set_si(b_val, FIX2NUM(b));
free_b_val = 1;
} else if (BIGNUM_P(b)) {
mpz_temp_from_bignum(b_val, b);
free_b_val = 1;
} else {
typeerror_as(ZXB, "addend");
}
mpz_get_struct(self, self_val);
if (GMPZ_P(c)) {
mpz_get_struct(c, c_val);
mpz_submul(self_val, b_val, c_val);
} else if (FIXNUM_P(c)) {
if (FIX2NUM(c) < 0)
{
if (free_b_val) { mpz_temp_free(b_val); }
rb_raise(rb_eRangeError, "multiplicand (Fixnum) must be nonnegative");
}
mpz_submul_ui(self_val, b_val, FIX2NUM(c));
} else if (BIGNUM_P(c)) {
mpz_temp_from_bignum(c_val, c);
mpz_submul(self_val, b_val, c_val);
mpz_temp_free(c_val);
} else {
if (free_b_val)
mpz_temp_free(b_val);
typeerror_as(ZXB, "multiplicand");
}
if (free_b_val)
mpz_temp_free(b_val);
return self;
}
|
#swap(b) ⇒ Object
Efficiently swaps the contents of a with b. b must be an instance of GMP::Z.
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# File 'ext/gmpz.c', line 753
VALUE r_gmpz_swap(VALUE self, VALUE arg)
{
MP_INT *self_val, *arg_val;
if (!GMPZ_P(arg)) {
rb_raise(rb_eTypeError, "Can't swap GMP::Z with object of other class");
}
mpz_get_struct(self, self_val);
mpz_get_struct(arg, arg_val);
mpz_swap(self_val,arg_val);
return Qnil;
}
|
#tdiv ⇒ Object
call-seq:
n.tdiv(d)
Divides n by d, forming a quotient q. tdiv rounds q towards zero. The t stands for “truncate”.
q will satisfy n=q*d+r, and r will satisfy 0 <= abs( r ) < abs( d ).
This function calculates only the quotient.
#tmod ⇒ Object
call-seq:
n.tmod(d)
Divides n by d, forming a remainder r. r will have the same sign as n. The t stands for “truncate”.
r will satisfy n=q*d+r, and r will satisfy 0 <= abs( r ) < abs( d ).
This function calculates only the remainder.
The remainder can be negative, so the return value is the absolute value of the remainder.
#to_d ⇒ Object
Implement mpz_fits_slong_p
Returns a as a Float if a fits in a Float.
Otherwise returns the least significant part of a, with the same sign as a.
If a is too big to fit in a Float, the returned result is probably not very useful. To find out if the value will fit, use the function mpz_fits_slong_p
(Unimplemented).
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# File 'ext/gmpz.c', line 813
VALUE r_gmpz_to_d(VALUE self)
{
MP_INT *self_val;
mpz_get_struct(self, self_val);
return rb_float_new(mpz_get_d(self_val));
}
|
#to_i ⇒ Object
Implement mpz_fits_slong_p
Returns a as an Fixnum if a fits into a Fixnum.
Otherwise returns the least significant part of a, with the same sign as a.
If a is too big to fit in a Fixnum, the returned result is probably not very useful. To find out if the value will fit, use the function mpz_fits_slong_p
(Unimplemented).
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# File 'ext/gmpz.c', line 784
VALUE r_gmpz_to_i(VALUE self)
{
MP_INT *self_val;
char *str;
VALUE res;
mpz_get_struct(self, self_val);
if (mpz_fits_slong_p(self_val))
return rb_int2inum(mpz_get_si(self_val));
str = mpz_get_str(NULL, 0, self_val);
res = rb_cstr2inum(str, 10);
free(str);
return res;
}
|
#to_s(*args) ⇒ Object
call-seq:
a.to_s(base = 10)
a.to_s(:bin)
a.to_s(:oct)
a.to_s(:dec)
a.to_s(:hex)
Returns a, as a String. If base is not provided, then the decimal representation will be returned.
From the GMP Manual:
Convert a to a string of digits in base base. The base argument may vary from 2 to 62 or from -2 to -36.
For base in the range 2..36, digits and lower-case letters are used; for -2..-36, digits and upper-case letters are used; for 37..62, digits, upper-case letters, and lower-case letters (in that significance order) are used.
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# File 'ext/gmpz.c', line 843
VALUE r_gmpz_to_s(int argc, VALUE *argv, VALUE self)
{
MP_INT *self_val;
char *str;
VALUE res;
VALUE base;
int base_val = 10;
ID base_id;
const char * bin_base = "bin"; /* binary */
const char * oct_base = "oct"; /* octal */
const char * dec_base = "dec"; /* decimal */
const char * hex_base = "hex"; /* hexadecimal */
ID bin_base_id = rb_intern(bin_base);
ID oct_base_id = rb_intern(oct_base);
ID dec_base_id = rb_intern(dec_base);
ID hex_base_id = rb_intern(hex_base);
rb_scan_args(argc, argv, "01", &base);
if (NIL_P(base)) { base = INT2FIX(10); } /* default value */
if (FIXNUM_P(base)) {
base_val = FIX2INT(base);
if ((base_val >= 2 && base_val <= 62) ||
(base_val >= -36 && base_val <= -2)) {
/* good base */
} else {
base_val = 10;
rb_raise(rb_eRangeError, "base must be within [2, 62] or [-36, -2].");
}
} else if (SYMBOL_P(base)) {
base_id = rb_to_id(base);
if (base_id == bin_base_id) {
base_val = 2;
} else if (base_id == oct_base_id) {
base_val = 8;
} else if (base_id == dec_base_id) {
base_val = 10;
} else if (base_id == hex_base_id) {
base_val = 16;
} else {
base_val = 10; /* should raise an exception here. */
}
}
Data_Get_Struct(self, MP_INT, self_val);
str = mpz_get_str(NULL, base_val, self_val);
res = rb_str_new2(str);
free (str);
return res;
}
|
#tshr ⇒ Object
call-seq:
n.tshr(d)
Divides n by 2^d, forming a quotient q. tshr rounds q towards zero. The t stands for “truncate”.
q will satisfy n=q*d+r, and r will satisfy 0 <= abs( r ) < abs( d ).
This function calculates only the quotient.
#| ⇒ Object
call-seq:
a | b
Returns a bitwise inclusive-or b. b must be an instance of one of the following:
-
GMP::Z
-
Fixnum
-
Bignum