Class: GMP::Q
- Inherits:
-
Numeric
- Object
- Numeric
- GMP::Q
- Defined in:
- ext/gmpq.c,
ext/gmp.c,
ext/gmpq.c
Overview
GMP Multiple Precision Rational Number.
Instances of this class can store variables of the type mpq_t. This class also contains many methods that act as the functions for mpq_t variables, as well as a few methods that attempt to make this library more Ruby-ish.
The following list is just a simple checklist for me, really. A better reference should be found in the rdocs.
Ruby method C Extension function GMP function
to_d r_gmpq_to_d mpq_get_d
to_s r_gmpq_to_s ?
add r_gmpq_add mpq_add
sub r_gmpq_sub mpq_sub
mul r_gmpq_mul mpq_mul
div r_gmpq_div mpq_div
-@ r_gmpq_neg mpq_neg
neg r_gmpq_neg mpq_neg
neg! r_gmpq_neg_self mpq_neg
abs r_gmpq_abs mpq_abs
abs! r_gmpq_abs_self mpq_abs
Class Method Summary collapse
-
.GMP::Q.new(arg) ⇒ Object
Creates a new GMP::Q rational, with arg as its value, converting where necessary.
Instance Method Summary collapse
-
#*(rat2) ⇒ Object
Multiplies
rat1
withrat2
. -
#+(rat2) ⇒ Object
Adds
rat1
torat2
. -
#-(rat2) ⇒ Object
Subtracts
rat2
fromrat1
. - #-@ ⇒ Object
-
#/(rat2) ⇒ Object
Divides
rat1
byrat2
. - #< ⇒ Object
- #<= ⇒ Object
-
#<=>(arg) ⇒ Object
Comparing Rationals.
- #==(arg) ⇒ Object
- #> ⇒ Object
- #>= ⇒ Object
-
#abs ⇒ Object
call-seq: rational.abs.
-
#abs! ⇒ Object
call-seq: rational.abs!.
- #ceil ⇒ Object
- #cmpabs ⇒ Object
- #coerce(arg) ⇒ Object
- #den ⇒ Object
-
#floor ⇒ Object
unsorted.
- #initialize(*args) ⇒ Object constructor
- #inv ⇒ Object
- #inv! ⇒ Object
-
#neg! ⇒ Object
call-seq: rational.neg!.
- #num ⇒ Object
-
#sgn ⇒ Object
From the GMP Manual:.
-
#rat2 ⇒ Object
Efficiently swaps the contents of
rat1
withrat2
. -
#to_d ⇒ Object
(also: #to_f)
Returns
rational
as an Float ifrational
fits in a Float. -
#to_s ⇒ Object
call-seq: rational.to_s.
- #trunc ⇒ Object
Constructor Details
#initialize(*args) ⇒ Object
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# File 'ext/gmp.c', line 43
static VALUE r_gmpq_initialize(int argc, VALUE *argv, VALUE self)
{
MP_RAT *self_val, *arg_val;
if (argc != 0) {
mpq_get_struct(self, self_val);
if (argc == 1 && GMPQ_P(argv[0])) {
mpq_get_struct(argv[0], arg_val);
mpq_set (self_val, arg_val);
} else if (argc == 1 && STRING_P(argv[0])) {
mpq_str_set (self_val, StringValuePtr(argv[0]));
} else {
mpz_set_value (mpq_numref(self_val), argv[0]);
if (argc == 2) {
mpz_set_value (mpq_denref(self_val), argv[1]);
mpq_canonicalize(self_val);
}
}
}
return Qnil;
}
|
Class Method Details
.GMP::Q.new(arg) ⇒ Object
Creates a new GMP::Q rational, with arg as its value, converting where necessary.
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# File 'ext/gmpq.c', line 68
VALUE r_gmpqsg_new(int argc, VALUE *argv, VALUE klass)
{
MP_RAT *res_val;
VALUE res;
(void)klass;
if (argc > 2)
rb_raise(rb_eArgError, "wrong # of arguments(%d for 0, 1 or 2)", argc);
mpq_make_struct (res, res_val);
mpq_init (res_val);
rb_obj_call_init(res, argc, argv);
return res;
}
|
Instance Method Details
#*(rat2) ⇒ Object
Multiplies rat1
with rat2
. rat2
can be
-
GMP::Z
-
Fixnum
-
GMP::Q
-
GMP::F
-
Bignum
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# File 'ext/gmpq.c', line 311
VALUE r_gmpq_mul(VALUE self, VALUE arg)
{
MP_RAT *self_val, *arg_val_q, *res_val;
MP_INT *arg_val_z, *tmp_z;
VALUE res;
#if GMP >= 4
unsigned long tmp_ui;
#endif
mpq_get_struct(self, self_val);
mpq_make_struct_init(res, res_val);
if (GMPQ_P(arg)) {
mpq_get_struct(arg,arg_val_q);
mpq_mul(res_val, self_val, arg_val_q);
} else if (GMPZ_P(arg)) {
mpz_get_struct(arg,arg_val_z);
mpz_temp_init(tmp_z);
mpz_gcd(tmp_z, mpq_denref(self_val), arg_val_z);
mpz_divexact(mpq_denref(res_val), mpq_denref(self_val), tmp_z);
mpz_divexact(mpq_numref(res_val), arg_val_z, tmp_z);
mpz_mul(mpq_numref(res_val), mpq_numref(res_val), mpq_numref(self_val));
mpz_temp_free(tmp_z);
} else if (FIXNUM_P(arg)) {
#if GMP >= 4
if (FIX2NUM(arg) > 0) {
tmp_ui = mpz_gcd_ui(0, mpq_denref(self_val), FIX2NUM(arg));
} else if (FIX2NUM(arg) < 0) {
tmp_ui = mpz_gcd_ui(0, mpq_denref(self_val), -FIX2NUM(arg));
} else {
mpz_set_ui(mpq_numref(res_val), 0);
mpz_set_ui(mpq_denref(res_val), 1);
return res;
}
mpz_divexact_ui(mpq_denref(res_val), mpq_denref(self_val), tmp_ui);
mpz_mul_ui(mpq_numref(res_val), mpq_numref(self_val), FIX2NUM(arg)/tmp_ui);
#else
mpz_set(mpq_denref(res_val), mpq_denref(self_val));
mpz_mul_si(mpq_numref(res_val), mpq_numref(self_val), FIX2NUM(arg));
mpq_canonicalize(res_val);
#endif
} 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_temp_alloc(tmp_z);
mpz_set_bignum(tmp_z, arg);
mpz_gcd(mpq_denref(res_val), mpq_denref(self_val), tmp_z);
mpz_divexact(mpq_numref(res_val), tmp_z, mpq_denref(res_val));
mpz_divexact(mpq_denref(res_val), mpq_denref(self_val), mpq_denref(res_val));
mpz_mul(mpq_numref(res_val), mpq_numref(res_val), mpq_numref(self_val));
mpz_temp_free(tmp_z);
} else {
typeerror(ZQFXB);
}
return res;
}
|
#+(rat2) ⇒ Object
Adds rat1
to rat2
. rat2
can be
-
GMP::Z
-
Fixnum
-
GMP::Q
-
GMP::F
-
Bignum
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# File 'ext/gmpq.c', line 204
VALUE r_gmpq_add(VALUE self, VALUE arg)
{
MP_RAT *self_val, *arg_val_q, *res_val;
MP_INT *arg_val_z, *res_val_num;
VALUE res;
mpq_get_struct(self, self_val);
mpq_make_struct_init(res, res_val);
if (GMPQ_P(arg)) {
mpq_get_struct(arg,arg_val_q);
mpq_add(res_val, self_val, arg_val_q);
} else if (GMPZ_P(arg)) {
res_val_num = mpq_numref(res_val);
mpz_set(mpq_denref(res_val), mpq_denref(self_val));
mpz_get_struct(arg, arg_val_z);
mpz_mul(res_val_num, mpq_denref(self_val), arg_val_z);
mpz_add(res_val_num, res_val_num, mpq_numref(self_val));
} else if (FIXNUM_P(arg)) {
res_val_num = mpq_numref(res_val);
mpz_set(mpq_denref(res_val), mpq_denref(self_val));
mpz_mul_si(res_val_num, mpq_denref(self_val), FIX2NUM(arg));
mpz_add(res_val_num, res_val_num, mpq_numref(self_val));
} 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)) {
res_val_num = mpq_numref(res_val);
mpz_set(mpq_denref(res_val), mpq_denref(self_val));
mpz_set_bignum(res_val_num, arg);
mpz_mul(res_val_num, res_val_num, mpq_denref(self_val));
mpz_add(res_val_num, res_val_num, mpq_numref(self_val));
} else {
typeerror(ZQFXB);
}
return res;
}
|
#-(rat2) ⇒ Object
Subtracts rat2
from rat1
. rat2
can be
-
GMP::Z
-
Fixnum
-
GMP::Q
-
GMP::F
-
Bignum
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# File 'ext/gmpq.c', line 256
VALUE r_gmpq_sub(VALUE self, VALUE arg)
{
MP_RAT *self_val, *arg_val_q, *res_val;
MP_INT *arg_val_z, *res_val_num;
MP_FLOAT *arg_val_f, *res_val_f;
VALUE res;
mpfr_prec_t prec;
mpq_get_struct(self, self_val);
mpq_make_struct_init(res, res_val);
if (GMPQ_P(arg)) {
mpq_get_struct(arg,arg_val_q);
mpq_sub (res_val, self_val, arg_val_q);
} else if (GMPZ_P(arg)) {
res_val_num = mpq_numref(res_val);
mpz_set (mpq_denref(res_val), mpq_denref(self_val));
mpz_get_struct(arg, arg_val_z);
mpz_mul (res_val_num, mpq_denref(self_val), arg_val_z);
mpz_neg (res_val_num, res_val_num);
mpz_add (res_val_num, res_val_num, mpq_numref(self_val));
} else if (FIXNUM_P(arg)) {
res_val_num = mpq_numref(res_val);
mpz_set (mpq_denref(res_val), mpq_denref(self_val));
mpz_mul_si (res_val_num, mpq_denref(self_val), -FIX2NUM(arg));
mpz_add (res_val_num, res_val_num, mpq_numref(self_val));
} 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_q (res_val_f, self_val);
mpf_sub (res_val_f, res_val_f, arg_val_f);
} else if (BIGNUM_P(arg)) {
res_val_num = mpq_numref(res_val);
mpz_set (mpq_denref(res_val), mpq_denref(self_val));
mpz_set_bignum (res_val_num, arg);
mpz_mul (res_val_num, res_val_num, mpq_denref(self_val));
mpz_neg (res_val_num, res_val_num);
mpz_add (res_val_num, res_val_num, mpq_numref(self_val));
} else {
typeerror (ZQFXB);
}
return res;
}
|
#-@ ⇒ Object
#/(rat2) ⇒ Object
Divides rat1
by rat2
. rat2
can be
-
GMP::Z
-
Fixnum
-
GMP::Q
-
GMP::F
-
Bignum
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# File 'ext/gmpq.c', line 383
VALUE r_gmpq_div(VALUE self, VALUE arg)
{
MP_RAT *self_val, *arg_val_q, *res_val;
MP_INT *arg_val_z, *tmp_z;
MP_FLOAT *arg_val_f, *res_val_f;
VALUE res;
unsigned long tmp_ui, prec;
mpq_get_struct(self, self_val);
mpq_make_struct_init(res, res_val);
if (GMPQ_P(arg)) {
mpq_get_struct(arg,arg_val_q);
if (mpz_sgn(mpq_numref(arg_val_q)) == 0)
rb_raise(rb_eZeroDivError, "divided by 0");
mpq_div(res_val, self_val, arg_val_q);
} else if (GMPZ_P(arg)) {
mpz_get_struct(arg,arg_val_z);
mpz_temp_init(tmp_z);
mpz_gcd(tmp_z, mpq_numref(self_val), arg_val_z);
mpz_divexact(mpq_numref(res_val), mpq_numref(self_val), tmp_z);
mpz_divexact(mpq_denref(res_val), arg_val_z, tmp_z);
mpz_mul(mpq_denref(res_val), mpq_denref(res_val), mpq_denref(self_val));
mpz_temp_free(tmp_z);
} else if (FIXNUM_P(arg)) {
if (FIX2NUM(arg) == 0)
rb_raise(rb_eZeroDivError, "divided by 0");
if (FIX2NUM(arg) > 0) {
tmp_ui = mpz_gcd_ui(0, mpq_numref(self_val), FIX2NUM(arg));
} else {
tmp_ui = mpz_gcd_ui(0, mpq_numref(self_val), -FIX2NUM(arg));
}
mpz_divexact_ui(mpq_numref(res_val), mpq_numref(self_val), tmp_ui);
mpz_mul_ui(mpq_denref(res_val), mpq_denref(self_val), FIX2NUM(arg)/tmp_ui);
} 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_q(res_val_f, self_val);
mpf_div(res_val_f, res_val_f, arg_val_f);
} else if (BIGNUM_P(arg)) {
mpz_temp_alloc(tmp_z);
mpz_set_bignum(tmp_z, arg);
mpz_gcd(mpq_numref(res_val), mpq_numref(self_val), tmp_z);
mpz_divexact(mpq_denref(res_val), tmp_z, mpq_numref(res_val));
mpz_divexact(mpq_numref(res_val), mpq_numref(self_val), mpq_numref(res_val));
mpz_mul(mpq_denref(res_val), mpq_denref(res_val), mpq_denref(self_val));
mpz_temp_free(tmp_z);
} else {
typeerror(ZQFXB);
}
return res;
}
|
#< ⇒ Object
#<= ⇒ Object
#<=>(arg) ⇒ Object
Comparing Rationals
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# File 'ext/gmpq.c', line 619
VALUE r_gmpq_cmp(VALUE self, VALUE arg)
{
MP_RAT *self_val;
int res;
mpq_get_struct (self,self_val);
res = mpq_cmp_value(self_val, arg);
if (res > 0)
return INT2FIX(1);
else if (res == 0)
return INT2FIX(0);
else
return INT2FIX(-1);
}
|
#==(arg) ⇒ Object
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# File 'ext/gmpq.c', line 585
VALUE r_gmpq_eq(VALUE self, VALUE arg)
{
MP_RAT *self_val, *arg_val_q;
MP_INT *arg_val_z;
mpq_get_struct(self,self_val);
if (GMPQ_P(arg)) {
mpq_get_struct(arg,arg_val_q);
return mpq_equal(self_val,arg_val_q)?Qtrue:Qfalse;
} else if (GMPZ_P(arg)) {
if (mpz_cmp_ui(mpq_denref(self_val), 1) != 0)
return Qfalse;
mpz_get_struct (arg, arg_val_z);
return (mpz_cmp(mpq_numref(self_val),arg_val_z)==0)?Qtrue:Qfalse;
} else if (FIXNUM_P(arg)) {
if (mpz_cmp_ui(mpq_denref(self_val), 1) != 0)
return Qfalse;
return (mpz_cmp_ui(mpq_numref(self_val),FIX2INT(arg))==0)?Qtrue:Qfalse;
} else if (BIGNUM_P(arg)) {
if (mpz_cmp_ui(mpq_denref(self_val), 1) != 0)
return Qfalse;
mpz_temp_from_bignum(arg_val_z, arg);
if (mpz_cmp (mpq_numref(self_val),arg_val_z) == 0) {
mpz_temp_free (arg_val_z);
return Qtrue;
} else {
mpz_temp_free (arg_val_z);
return Qfalse;
}
} else {
return Qfalse;
}
}
|
#> ⇒ Object
#>= ⇒ Object
#abs ⇒ Object
call-seq:
rational.abs
From the GMP Manual:
Returns the absolute value of rational
.
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# File 'ext/gmpq.c', line 489
VALUE r_gmpq_abs(VALUE self)
{
MP_RAT *self_val, *res_val;
VALUE res;
mpq_get_struct(self, self_val);
mpq_make_struct_init(res, res_val);
mpz_abs (mpq_numref(res_val), mpq_numref(self_val));
mpz_set (mpq_denref(res_val), mpq_denref(self_val));
return res;
}
|
#abs! ⇒ Object
call-seq:
rational.abs!
From the GMP Manual:
Sets rational
to its absolute value.
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# File 'ext/gmpq.c', line 511
VALUE r_gmpq_abs_self(VALUE self)
{
MP_RAT *self_val;
mpq_get_struct(self, self_val);
mpz_abs (mpq_numref(self_val), mpq_numref(self_val));
return Qnil;
}
|
#ceil ⇒ Object
#cmpabs ⇒ Object
#coerce(arg) ⇒ Object
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# File 'ext/gmp.c', line 70
static VALUE r_gmpq_coerce(VALUE self, VALUE arg)
{
return rb_assoc_new(r_gmpqsg_new(1, &arg, cGMP_Q), self);
}
|
#den ⇒ Object
#floor ⇒ Object
unsorted
#inv ⇒ Object
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# File 'ext/gmpq.c', line 519
VALUE r_gmpq_inv(VALUE self)
{
MP_RAT *self_val, *res_val;
VALUE res;
mpq_get_struct(self, self_val);
if (mpq_sgn(self_val) == 0)
rb_raise (rb_eZeroDivError, "divided by 0");
mpq_make_struct_init(res, res_val);
mpq_inv (res_val, self_val);
return res;
}
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#inv! ⇒ Object
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# File 'ext/gmpq.c', line 533
VALUE r_gmpq_inv_self(VALUE self)
{
MP_RAT *self_val;
mpq_get_struct(self, self_val);
if (mpq_sgn(self_val) == 0)
rb_raise (rb_eZeroDivError, "divided by 0");
mpq_inv (self_val, self_val);
return Qnil;
}
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#neg! ⇒ Object
call-seq:
rational.neg!
From the GMP Manual:
Sets rational
to -rational
.
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# File 'ext/gmpq.c', line 471
VALUE r_gmpq_neg_self(VALUE self)
{
MP_RAT *self_val;
mpq_get_struct(self, self_val);
mpz_neg (mpq_numref(self_val), mpq_numref(self_val));
return Qnil;
}
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#num ⇒ Object
#sgn ⇒ Object
From the GMP Manual:
Returns +1 if rational
> 0, 0 if rational
== 0, and -1 if rational
< 0.
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# File 'ext/gmpq.c', line 713
VALUE r_gmpq_sgn(VALUE self)
{
MP_RAT *self_val;
mpq_get_struct(self, self_val);
return INT2FIX(mpq_sgn(self_val));
}
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#rat2 ⇒ Object
Efficiently swaps the contents of rat1
with rat2
.
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# File 'ext/gmpq.c', line 103
VALUE r_gmpq_swap(VALUE self, VALUE arg)
{
MP_RAT *self_val, *arg_val;
if (!GMPQ_P(arg)) {
rb_raise(rb_eTypeError, "Can't swap GMP::Q with object of other class");
}
mpq_get_struct(self, self_val);
mpq_get_struct(arg, arg_val);
mpq_swap(self_val,arg_val);
return Qnil;
}
|
#to_d ⇒ Object Also known as: to_f
Returns rational
as an Float if rational
fits in a Float.
Otherwise returns the least significant part of rational
, with the same sign as rational
.
If the exponent from the conversion is too big or too small to fit a double then the result is system dependent. For too big an infinity is returned when available. For too small 0.0 is normally returned. Hardware overflow, underflow and denorm traps may or may not occur.
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# File 'ext/gmpq.c', line 137
VALUE r_gmpq_to_d(VALUE self)
{
MP_RAT *self_val;
mpq_get_struct(self, self_val);
return rb_float_new(mpq_get_d(self_val));
}
|
#to_s ⇒ Object
call-seq:
rational.to_s
Returns the decimal representation of rational
, as a Ruby string.
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# File 'ext/gmpq.c', line 153
VALUE r_gmpq_to_s(VALUE self)
{
MP_RAT *self_val;
MP_INT *self_val_num, *self_val_den;
char *str;
VALUE res;
size_t sizeinbase;
size_t offset;
//Data_Get_Struct (self, MP_RAT, self_val);
mpq_get_struct(self, self_val)
if (mpz_cmp_ui (mpq_denref (self_val), 1) == 0) {
str = mpz_get_str (NULL, 10, mpq_numref (self_val));
res = rb_str_new2 (str);
free (str);
return res;
}
self_val_num = mpq_numref (self_val);
self_val_den = mpq_denref (self_val);
sizeinbase = mpz_sizeinbase (self_val_num, 10) + mpz_sizeinbase (self_val_den, 10) + 3;
str = malloc (sizeinbase);
mpz_get_str (str, 10, self_val_num);
offset = strlen (str);
str[offset] = '/';
mpz_get_str (str + offset + 1, 10, self_val_den);
res = rb_str_new2(str);
free (str);
return res;
}
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