Your own math function : Math extensions « Development « Ruby

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3. Math extensions

Your own math function

module Math
  RAD2DEG = 360.0/(2.0*PI)  # Radians to degrees
  RAD2GRAD = 400.0/(2.0*PI) # Radians to grads
end

def sin_d(theta)
  Math.sin(theta/Math::RAD2DEG)
end

def sin_g(theta)
  Math.sin(theta/Math::RAD2GRAD)
end

def atan2_d(y,x)
  Math.atan2(y,x)/Math::RAD2DEG
end

def atan2_g(y,x)
  Math.atan2(y,x)/Math::RAD2GRAD
end

def arcsin(x)
Math.atan2(x,Math.sqrt(1.0-x*x))
end

def arccos(x)
Math.atan2(Math.sqrt(1.0-x*x),x)
end

def arctan(x)
Math.atan2(x,1.0)
end

def sinh(x)
  (Math.exp(x)-Math.exp(-x))/2.0
end

def cosh(x)
  (Math.exp(x)+Math.exp(-x))/2.0
end

def tanh(x)
  sinh(x)/cosh(x)
end

def asinh(x)
  Math.log(x + Math.sqrt(1.0+x**2))
end

def acosh(x)
  2.0 *Math.log(Math.sqrt((x+1.0)/2.0)+Math.sqrt((x-1)/2.0))
end

def atanh(x)
  (Math.log(1.0+x) - Math.log(1.0-x))/2.0
end

 

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