Module: NMath

Defined in:
lib/narray_ext.rb

Constant Summary collapse

PI = 
Math::PI
E = 
Math::E

Class Method Summary collapse

Class Method Details

.acot(x) ⇒ Object 



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# File 'lib/narray_ext.rb', line 326

def acot x
  atan(1/x.to_f)
end

.acoth(x) ⇒ Object 



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# File 'lib/narray_ext.rb', line 329

def acoth x
  atanh(1/x.to_f)
end

.acsc(x) ⇒ Object 



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# File 'lib/narray_ext.rb', line 300

def acsc x
  asin(1/x.to_f)
end

.acsch(x) ⇒ Object 



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# File 'lib/narray_ext.rb', line 303

def acsch x
  asinh(1/x.to_f)
end

.asec(x) ⇒ Object 



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# File 'lib/narray_ext.rb', line 313

def asec x
  acos(1/x.to_f)
end

.asech(x) ⇒ Object 



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# File 'lib/narray_ext.rb', line 316

def asech x
  acosh(1/x.to_f)
end

.atan2(y, x) ⇒ Object

method: atan2(y,x)



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# File 'ext/narray/na_func.c', line 743

static VALUE na_math_atan2(VALUE module, volatile VALUE y, volatile VALUE x)
{
  VALUE ans;
  struct NARRAY *ya, *xa, *aa;

  if (TYPE(y) == T_ARRAY) {
    y = na_ary_to_nary(y,cNArray);
  } else
  if (!IsNArray(y)) {
    y = na_make_scalar(y,na_object_type(y));
  }

  if (TYPE(x) == T_ARRAY) {
    x = na_ary_to_nary(x,cNArray);
  } else
  if (!IsNArray(x)) {
    x = na_make_scalar(x,na_object_type(x));
  }

  GetNArray(y,ya);
  GetNArray(x,xa);
  if (NA_IsINTEGER(ya) && NA_IsINTEGER(xa)) {
    y = na_upcast_type(y,NA_DFLOAT);
    x = na_upcast_type(x,NA_DFLOAT);
  }

  ans = na_bifunc( y, x, Qnil, atan2Funcs );
  GetNArray(ans,aa);

  if (CLASS_OF(y) == cNArrayScalar && CLASS_OF(x) == cNArrayScalar)
    SetFuncs[NA_ROBJ][aa->type](1,&ans,0,aa->ptr,0);

  return ans;
}

.cot(x) ⇒ Object 



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# File 'lib/narray_ext.rb', line 320

def cot x
  1/tan(x)
end

.coth(x) ⇒ Object 



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# File 'lib/narray_ext.rb', line 323

def coth x
  1/tanh(x)
end

.covariance(x, y, *ranks) ⇒ Object

Statistics



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# File 'lib/narray_ext.rb', line 334

def covariance(x,y,*ranks)
  x = NArray.to_na(x) unless x.kind_of?(NArray)
  x = x.to_type(NArray::DFLOAT) if x.integer?
  y = NArray.to_na(y) unless y.kind_of?(NArray)
  y = y.to_type(NArray::DFLOAT) if y.integer?
  n = x.rank_total(*ranks)
  xm = x.accum(*ranks).div!(n)
  ym = y.accum(*ranks).div!(n)
  ((x-xm)*(y-ym)).sum(*ranks) / (n-1)
end

.csc(x) ⇒ Object

Trigonometric function



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# File 'lib/narray_ext.rb', line 294

def csc x
  1/sin(x)
end

.csch(x) ⇒ Object 



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# File 'lib/narray_ext.rb', line 297

def csch x
  1/sinh(x)
end

.recip(x) ⇒ Object 



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# File 'lib/narray_ext.rb', line 289

def recip x
  1/x.to_f
end

.sec(x) ⇒ Object 



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# File 'lib/narray_ext.rb', line 307

def sec x
  1/cos(x)
end

.sech(x) ⇒ Object 



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# File 'lib/narray_ext.rb', line 310

def sech x
  1/cosh(x)
end