Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

executable file 24 lines (20 sloc) 0.678 kb
#!/usr/bin/perl -w
use strict;
use Math::GSL::Deriv qw/:all/;
use Math::GSL::Errno qw/:all/;
# This is a numerical verification of the mathematical fact
# that the derivative of sin(x) is cos(x), i.e.
#
# d
# -( sin(x) ) = cos(x)
# dx
my ($x, $h) = (1.5, 0.01);
my ($status, $val,$err) = gsl_deriv_central ( sub { sin($_[0]) }, $x, $h);
my $res = abs($val - cos($x));
if ($status == $GSL_SUCCESS) {
printf "deriv(sin((%g)) = %.18g, max error=%.18g\n", $x, $val, $err;
printf " cos(%g)) = %.18g, residue= %.18g\n" , $x, cos($x), $res;
} else {
my $gsl_error = gsl_strerror($status);
print "Numerical Derivative FAILED, reason:\n $gsl_error\n\n";
}
Jump to Line
Something went wrong with that request. Please try again.