Math

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

module 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).

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

Copyright © 2001 by Addison Wesley Longman, Inc. This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/).

Distribution of substantively modified versions of this document is prohibited without the explicit permission of the copyright holder.

Distribution of the work or derivative of the work in any standard (paper) book form is prohibited unless prior permission is obtained from the copyright holder.

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

Programming Ruby

The Pragmatic Programmer's Guide

module Math

constants

module methods