Clean up Sys POD

pod/Sys.pod

@@ -37,36 +37,66 @@ __END__
 
 =head1 NAME
 
-Math::GSL::Sys -
+Math::GSL::Sys - Misc Math Functions
 
 =head1 SYNOPSIS
 
-use Math::GSL::Sys qw /:all/;
+    use Math::GSL::Sys qw/:all/;
 
 =head1 DESCRIPTION
 
-Here is a list of all the functions in this module :
+This module contains various useful math functions that are not usually
+provided by standard libraries.
 
 =over
 
-=item * C<gsl_log1p($x)> - This function computes the value of \log(1+$x) in a way that is accurate for small $x. It provides an alternative to the BSD math function log1p(x).
-=item * C<gsl_expm1($x)> - This function computes the value of \exp($x)-1 in a way that is accurate for small $x. It provides an alternative to the BSD math function expm1(x).
+=item * C<gsl_log1p($x)> 
 
-=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,$y).
+This function computes the value of \log(1+$x) in a way that is accurate for
+small $x. It provides an alternative to the BSD math function log1p(x).
 
-=item * C<gsl_hypot3($x, $y, $z)> - This function computes the value of \sqrt{$x^2 + $y^2 + $z^2} in a way that avoids overflow.
+=item * C<gsl_expm1($x)> 
 
-=item * C<gsl_acosh($x)> - This function computes the value of \arccosh($x). It provides an alternative to the standard math function acosh($x).
+This function computes the value of \exp($x)-1 in a way that is accurate for
+small $x. It provides an alternative to the BSD math function expm1(x).
 
-=item * C<gsl_asinh($x)> - This function computes the value of \arcsinh($x). It provides an alternative to the standard math function asinh($x).
+=item * C<gsl_hypot($x, $y)> 
 
-=item * C<gsl_atanh($x)> - This function computes the value of \arctanh($x). It provides an alternative to the standard math function atanh($x).
+This function computes the value of \sqrt{$x^2 + $y^2} in a way that avoids
+overflow. It provides an alternative to the BSD math function hypot($x,$y).
 
-=item * C<gsl_isnan($x)> - This function returns 1 if $x is not-a-number.
+=item * C<gsl_hypot3($x, $y, $z)> 
 
-=item * C<gsl_isinf($x)> - This function returns +1 if $x is positive infinity, -1 if $x is negative infinity and 0 otherwise.
+This function computes the value of \sqrt{$x^2 + $y^2 + $z^2} in a way that
+avoids overflow.
 
-=item * C<gsl_finite($x)> - This function returns 1 if $x is a real number, and 0 if it is infinite or not-a-number.
+=item * C<gsl_acosh($x)> 
+
+This function computes the value of \arccosh($x). It provides an alternative to
+the standard math function acosh($x).
+
+=item * C<gsl_asinh($x)> 
+
+This function computes the value of \arcsinh($x). It provides an alternative to
+the standard math function asinh($x).
+
+=item * C<gsl_atanh($x)> 
+
+This function computes the value of \arctanh($x). It provides an alternative to
+the standard math function atanh($x).
+
+=item * C<gsl_isnan($x)> 
+
+This function returns 1 if $x is not-a-number.
+
+=item * C<gsl_isinf($x)>  
+
+This function returns +1 if $x is positive infinity, -1 if $x is negative
+infinity and 0 otherwise.
+
+=item * C<gsl_finite($x)> 
+
+This function returns 1 if $x is a real number, and 0 if it is infinite or not-a-number.
 
 =item * C<gsl_posinf >
 
@@ -80,20 +110,35 @@ Here is a list of all the functions in this module :
 
 =item * C<gsl_coerce_long_double >
 
-=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).
+=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).
+
+=item * C<gsl_frexp($x)> 
 
-=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).
+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).
 
-=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 $y are compared to relative accuracy, so this function is not suitable for testing whether a value is approximately zero. The implementation is based on the package fcmp by T.C. Belding.
+=item * C<gsl_fcmp($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.
 
 =back
 
 For more informations on the functions, we refer you to the GSL offcial
 documentation: L<http://www.gnu.org/software/gsl/manual/html_node/>
 
- Tip : search on google: site:http://www.gnu.org/software/gsl/manual/html_node/ name_of_the_function_you_want
-
-
 =head1 AUTHORS
 
 Jonathan "Duke" Leto <jonathan@leto.net> and Thierry Moisan <thierry.moisan@gmail.com>
@@ -108,4 +153,3 @@ under the same terms as Perl itself.
 =cut
 
 %}
-