19 gsl_coerce_long_double
31 our %EXPORT_TAGS = ( all => \@EXPORT_OK );
32 our $GSL_NAN = gsl_nan();
33 our $GSL_POSINF = gsl_posinf();
34 our $GSL_NEGINF = gsl_neginf();
44 use Math::GSL::Sys qw /:all/;
48 Here is a list of all the functions in this module :
52 =item * C<gsl_log1p($x)> - This function computes the value of \log(1+$x) in a way that is accurate for small $x. It provides an alternative to the BSD math function log1p(x).
53 =item * C<gsl_expm1($x)> - This function computes the value of \exp($x)-1 in a way that is accurate for small $x. It provides an alternative to the BSD math function expm1(x).
55 =item * C<gsl_hypot($x, $y)> - This function computes the value of \sqrt{$x^2 + $y^2} in a way that avoids overflow. It provides an alternative to the BSD math function hypot($x,$y).
57 =item * C<gsl_hypot3($x, $y, $z)> - This function computes the value of \sqrt{$x^2 + $y^2 + $z^2} in a way that avoids overflow.
59 =item * C<gsl_acosh($x)> - This function computes the value of \arccosh($x). It provides an alternative to the standard math function acosh($x).
61 =item * C<gsl_asinh($x)> - This function computes the value of \arcsinh($x). It provides an alternative to the standard math function asinh($x).
63 =item * C<gsl_atanh($x)> - This function computes the value of \arctanh($x). It provides an alternative to the standard math function atanh($x).
65 =item * C<gsl_isnan($x)> - This function returns 1 if $x is not-a-number.
67 =item * C<gsl_isinf($x)> - This function returns +1 if $x is positive infinity, -1 if $x is negative infinity and 0 otherwise.
69 =item * C<gsl_finite($x)> - This function returns 1 if $x is a real number, and 0 if it is infinite or not-a-number.
71 =item * C<gsl_posinf >
73 =item * C<gsl_neginf >
77 =item * C<gsl_coerce_double >
79 =item * C<gsl_coerce_float >
81 =item * C<gsl_coerce_long_double >
83 =item * C<gsl_ldexp($x, $e)> - This function computes the value of $x * 2**$e. It provides an alternative to the standard math function ldexp($x,$e).
85 =item * C<gsl_frexp($x)> - This function splits the number $x into its normalized fraction f and exponent e, such that $x = f * 2^e and 0.5 <= f < 1. The function returns f and then the exponent in e. If $x is zero, both f and e are set to zero. This function provides an alternative to the standard math function frexp(x, e).
87 =item * C<gsl_fcmp($x, $y, $epsilon)> - This function determines whether $x and $y are approximately equal to a relative accuracy $epsilon. The relative accuracy is measured using an interval of size 2 \delta, where \delta = 2^k \epsilon and k is the maximum base-2 exponent of $x and $y as computed by the function frexp. If $x and $y lie within this interval, they are considered approximately equal and the function returns 0. Otherwise if $x < $y, the function returns -1, or if $x > $y, the function returns +1. Note that $x and $y are compared to relative accuracy, so this function is not suitable for testing whether a value is approximately zero. The implementation is based on the package fcmp by T.C. Belding.
91 For more informations on the functions, we refer you to the GSL offcial
92 documentation: L<http://www.gnu.org/software/gsl/manual/html_node/>
94 Tip : search on google: site:http://www.gnu.org/software/gsl/manual/html_node/ name_of_the_function_you_want
99 Jonathan Leto <jonathan@leto.net> and Thierry Moisan <thierry.moisan@gmail.com>
101 =head1 COPYRIGHT AND LICENSE
103 Copyright (C) 2008-2009 Jonathan Leto and Thierry Moisan
105 This program is free software; you can redistribute it and/or modify it
106 under the same terms as Perl itself.