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Math::Symbolic::AuxFunUsernContributed Perl DocMath::Symbolic::AuxFunctions(3)

NAME
       Math::Symbolic::AuxFunctions - Auxiliary functions for Math::Symbolic
       hierarchy

SYNOPSIS
	 use Math::Symbolic::AuxFunctions;

	 Math::Symbolic::AuxFunctions::acos($x);
	 # etc

DESCRIPTION
       This module contains implementations of some auxiliary functions that
       are used within the Math::Symbolic hierarchy of modules. In particular,
       this module holds all trigonometric functions used for numeric
       evaluation of trees by Math::Symbolic::Operator.

   EXPORT
       None. On purpose. If I wished this module would pollute others'
       namespaces, I'd have put the functions right where they're used.

TRIGONOMETRIC FUNCTIONS
   tan
       Computes the tangent sin(x) / cos(x).

   cot
       Computes the cotangent cos(x) / sin(x).

   asin
       Computes the arc sine asin(z) = -i log(iz + sqrt(1-z*z)).  Above
       formula is for complex numbers.

   acos
       Computes the arc cosine acos(z) = -i log(z + sqrt(z*z-1)).  Above
       formula is for complex numbers.

   atan
       Computes the arc tangent atan(z) = i/2 log((i+z) / (i-z)).  Above
       formula is for complex numbers.

   acot
       Computes the arc cotangent ( atan( 1 / x ) ).

   asinh
       Computes the arc hyperbolic sine asinh(z) = log(z + sqrt(z*z+1))

   acosh
       Computes the arc hyperbolic cosine acosh(z) = log(z + sqrt(z*z-1)).

OTHER FUNCTIONS
   binomial_coeff
       Calculates the binomial coefficient n over k of its first two arguments
       (n, k).

       Code taken from Orwant et al, "Mastering Algorithms with Perl"

   bell_number
       The Bell numbers are defined as follows:

	 B_0   = 1
	 B_n+1 = sum_k=0_to_n( B_k * binomial_coeff(n, k) )

       This function uses memoization.

AUTHOR
       Please send feedback, bug reports, and support requests to the
       Math::Symbolic support mailing list: math-symbolic-support at lists dot
       sourceforge dot net. Please consider letting us know how you use
       Math::Symbolic. Thank you.

       If you're interested in helping with the development or extending the
       module's functionality, please contact the developers' mailing list:
       math-symbolic-develop at lists dot sourceforge dot net.

       List of contributors:

	 Steffen MA~Xller, symbolic-module at steffen-mueller dot net
	 Stray Toaster, mwk at users dot sourceforge dot net
	 Oliver EbenhA~Xh

SEE ALSO
       New versions of this module can be found on http://steffen-mueller.net
       or CPAN. The module development takes place on Sourceforge at
       http://sourceforge.net/projects/math-symbolic/

       Math::Symbolic

perl v5.14.1			  2011-07-26   Math::Symbolic::AuxFunctions(3)

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