Programming Ruby

The Pragmatic Programmer's Guide

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 module Math

Index:

atan2 cos exp frexp ldexp log log10 sin sqrt tan

The `Math` module contains module functions for basic trigonometric and transcendental functions.

 constants

 `E` 2.718281828 Value of e (base of natural logarithms) `PI` 3.141592654 Value of PI

 class methods atan2 Math.atan2( y, x ) -> aFloat Computes the arc tangent given y and x. Returns -PI..PI. cos Math.cos( aNumeric ) -> aFloat Computes the cosine of aNumeric (expressed in radians). Returns -1..1. exp Math.exp( aNumeric ) -> aFloat Returns e raised to the power of aNumeric. frexp Math.frexp( aNumeric ) -> anArray Returns a two-element array ([aFloat, aFixnum]) containing the normalized fraction and exponent of aNumeric. ldexp Math.ldexp( aFloat, anInteger ) -> aFloat Returns the value of aFloat *2 anInteger . log Math.log( aNumeric ) -> aFloat Returns the natural logarithm of aNumeric. log10 Math.log10( aNumeric ) -> aFloat Returns the base 10 logarithm of aNumeric. sin Math.sin( aNumeric ) -> aFloat Computes the sine of aNumeric (expressed in radians). Returns -1..1. sqrt Math.sqrt( aNumeric ) -> aFloat Returns the non-negative square root of aNumeric. Raises `ArgError` if aNumeric is less than zero. tan Math.tan( aNumeric ) -> aFloat Returns the tangent of aNumeric (expressed in radians).

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Extracted from the book "Programming Ruby - The Pragmatic Programmer's Guide"
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