Math Module
Revision as of 16:31, 3 December 2010 by 134.34.226.134 (talk)
The math module defines extension functions to perform mathematical operations, such as pi
, asin
and acos
. All functions are preceded by the math:
prefix. Some of the functions have also been specified in the
Functions and Operators Specification of the upcoming XQuery 1.1 Recommendation.
Contents
math:pi
Signatures |
|
Summary |
Returns the value of the mathematical constant π. |
Rules |
This function returns the xs:double value whose lexical representation is 3.141592653589793. |
Examples |
The expression 2*math:pi() returns 6.283185307179586e0 .The expression 60 * (math:pi() div 180) converts an angle of 60 degrees to radians. |
math:e
Signatures |
|
Summary |
Returns the value of the mathematical constant e. |
Rules |
This function returns the xs:double value whose lexical representation is 2.718281828459045. |
Examples |
The expression 5*math:e() returns 13.591409142295225 . |
math:sqrt
Signatures |
|
Summary |
Returns the square root of the argument. |
Rules |
If $arg is the empty sequence, the function returns the empty sequence.Otherwise the result is the xs:double value of the mathematical square root of $arg . |
math:sin
Signatures |
|
Summary |
Returns the sine of the argument, expressed in radians. |
Rules |
If $arg is the empty sequence, the function returns the empty sequence.Otherwise the result is the sine of $arg , treated as an angle in radians. |
math:cos
Signatures |
|
Summary |
Returns the cosine of the argument, expressed in radians. |
Rules |
If $arg is the empty sequence, the function returns the empty sequence.Otherwise the result is the cosine of $arg , treated as an angle in radians. |
math:tan
Signatures |
|
Summary |
Returns the tangent of the argument, expressed in radians. |
Rules |
If $arg is the empty sequence, the function returns the empty sequence.Otherwise the result is the tangent of $arg , treated as an angle in radians. |
math:asin
Signatures |
|
Summary |
Returns the arc sine of the argument. |
Rules |
If $arg is the empty sequence, the function returns the empty sequence.Otherwise the result is the arc sine of $arg , returned as an angle in radians in the range -π/2 to +π/2. |
math:acos
Signatures |
|
Summary |
Returns the arc cosine of the argument. |
Rules |
If $arg is the empty sequence, the function returns the empty sequence.Otherwise the result is the arc cosine of $arg , returned as an angle in radians in the range 0 to +π. |
math:atan
Signatures |
|
Summary |
Returns the arc tangent of the argument. |
Rules |
If $arg is the empty sequence, the function returns the empty sequence.Otherwise the result is the arc tangent of $arg , returned as an angle in radians in the range -π/2 to +π/2. |
math:atan2
Signatures |
|
Summary |
Returns the arc tangent of the first argument divided by the second argument, the result being in the range -π/2 to +π/2 radians. |
Rules |
If $arg1 is the empty sequence, the function returns the empty sequence.Otherwise the result is the arc tangent of $arg1 divided by $arg2 , returned as an angle in radians in the range -π to +π. |
math:pow
Signatures |
|
Summary |
Returns the first argument raised to the power of the second argument. |
Rules |
If $arg1 is the empty sequence, the function returns the empty sequence.Otherwise the result is the $arg1 raised to the power of $arg2 . |
Examples |
The expression math:pow(2, 3) returns 8 . |
math:exp
Signatures |
|
Summary |
Returns e raised to the power of the argument. |
Rules |
If $arg is the empty sequence, the function returns the empty sequence.Otherwise the result is the value of e raised to the power of $arg . |
Examples |
The expression math:exp(1) returns e. |
math:log
Signatures |
|
Summary |
Returns the natural logarithm of the argument. |
Rules |
If $arg is the empty sequence, the function returns the empty sequence.Otherwise the result is the natural logarithm (base e) of $arg . |
Examples |
The expression math:log(math:e()) returns 1 . |
math:log10
Signatures |
|
Summary |
Returns the base 10 logarithm of the argument. |
Rules |
If $arg is the empty sequence, the function returns the empty sequence.Otherwise the result is the base 10 logarithm of $arg . |
Examples |
The expression math:log(100) returns 2 . |
math:random
Signatures |
|
Summary |
Returns a random value. |
Rules |
This function returns a random xs:double value between 0.0 and 1.0 . |
math:sinh
Signatures |
|
Summary |
Returns the hyperbolic sine of the argument. |
Rules |
If $arg is the empty sequence, the function returns the empty sequence.Otherwise the result is the hyperbolic sine of $arg . |
Examples |
The expression math:sinh(0) returns 0 . |
math:cosh
Signatures |
|
Summary |
Returns the hyperbolic cosine of the argument. |
Rules |
If $arg is the empty sequence, the function returns the empty sequence.Otherwise the result is the hyperbolic cosine of $arg . |
Examples |
The expression math:cosh(0) returns 1 . |
math:tanh
Signatures |
|
Summary |
Returns the hyperbolic tangent of the argument. |
Rules |
If $arg is the empty sequence, the function returns the empty sequence.Otherwise the result is the hyperbolic tangent of $arg . |
Examples |
The expression math:tanh(100) returns 1 . |