Ruby Math Functions and Methods

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The Ruby Math module provides the Ruby programmer with an extensive range of methods to performing mathematical tasks. In addition the Math module includes two commonly used mathematical constants.

Ruby Math Constants

The Ruby Math module includes common math constants. A list of constants may be accessed using the constants method:

Math.constants
=> ["E", "PI"]

As we can see, as of tyhe current version of Ruby, only two constants are defined. We can access these using :: notation:

Math::PI
=> 3.14159265358979

Math::E
=> 2.71828182845905

Ruby Math Methods

As mentioned previously, Ruby provides an extensive range of meth related methods. These are liosted and described in the following table.

Method(s) Description
Math.acos, Math.acos! Arc cosine
Math.acosh, Math.acosh! Hyperbolic arc cosine
Math.asin, Math.asin! Arc sine
Math.asinh, Math.asinh Hyperbolic arc sine
Math.atan, Math.atan!, Math.atan2, Math.atan2! Arc tangent; atan takes an x argument; atan2 takes an x and a y argument
Math.atanh, Math.atanh! Hyperbolic arc tangent
Math.cos, Math.cos! Cosine
Math.cosh, Math.cosh Hyperbolic cosine
Math.sin, Math.sin! Sine
Math.erf Error function
Match.erfc Complementary error function
Math.exp, Math.exp! Base x of Euler
Math.frexp Normalized fraction and exponent
Math.hypot Hypotenuse
Math.ldexp Floating-point value corresponding to a given mantissa and exponent
Math.sinh, Math.sinh! Hyperbolic sine
Math.sqrt, Math.sqrt! Square root
Math.tan, Math.tan! Tangent
Math.tanh, Math.tanh! Hyperbolic tangent