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