# PDL interface to GSL differentation routines
# Makefile.PL for a package defined by PP code.
use ExtUtils::MakeMaker;
PDL::Core::Dev->import();
my $msg = undef;
my $forcebuild=0;
my $skip = 0;
# this Makefile uses get_gsl_libs which is defined in
# the parent Makefile.PL
sub gsl_mroot_links_ok {
my($lib,$inc) = @_;
return defined($lib) && defined($inc) &&
trylink 'gsl multidimensional root finding libraries',
<< 'EOI',
#include <stdio.h>
#include <stdlib.h>
#include <gsl/gsl_math.h>
#include <gsl/gsl_errno.h>
#include <gsl/gsl_vector.h>
#include <gsl/gsl_multiroots.h>
struct rparams{
double a;
double b;
};
int rosenbrock_f (const gsl_vector * x, void *params,gsl_vector * f){
double a = ((struct rparams *) params)->a;
double b = ((struct rparams *) params)->b;
const double x0 = gsl_vector_get (x, 0);
const double x1 = gsl_vector_get (x, 1);
const double y0 = a * (1 - x0);
const double y1 = b * (x1 - x0 * x0);
gsl_vector_set (f, 0, y0);
gsl_vector_set (f, 1, y1);
return GSL_SUCCESS;
}
EOI
<< 'EOB', $lib, $inc;
const gsl_multiroot_fsolver_type *T;
gsl_multiroot_fsolver *s;
int status;
size_t i, iter = 0;
const size_t n = 2;
struct rparams p = {1.0, 10.0};
gsl_multiroot_function f = {&rosenbrock_f, n, &p};
double x_init[2] = {-10.0, -5.0};
gsl_vector *x = gsl_vector_alloc (n);
gsl_vector_set (x, 0, x_init[0]);
gsl_vector_set (x, 1, x_init[1]);
T = gsl_multiroot_fsolver_hybrids;
s = gsl_multiroot_fsolver_alloc (T, 2);
gsl_multiroot_fsolver_set (s, &f, x);
do
{
iter++;
status = gsl_multiroot_fsolver_iterate (s);
if (status)
break;
status =
gsl_multiroot_test_residual (s->f, 1e-7);
}
while (status == GSL_CONTINUE && iter < 1000);
gsl_multiroot_fsolver_free (s);
gsl_vector_free (x);
return 0;
EOB
}
if (defined $PDL::Config{WITH_GSL} && $PDL::Config{WITH_GSL}==0) {
$msg = "\n Will skip build of PDL::GSL::MROOT on this system \n";
$skip = 1;
} elsif (defined $PDL::Config{WITH_GSL} && $PDL::Config{WITH_GSL}==1) {
print "\n Will forcibly try and build PDL::GSL::MROOT on this system \n\n";
$forcebuild=1;
}
if (($skip && !$forcebuild) ||
!gsl_mroot_links_ok($GSL_libs, $GSL_includes)) {
warn "trying to force GSL build but link test failed\n".
"\t -- aborting GSL build\n" if $forcebuild;
$msg ||=
"\n GSL Libraries not found... Skipping build of PDL::GSL::MROOT.\n";
warn $msg . "\n";
$msg =~ s/\n//g;
write_dummy_make( $msg );
return;
} else {
print "\n Building PDL::GSL::MROOT.",
"Turn off WITH_GSL if there are any problems\n\n";
}
@pack = (["gsl_mroot.pd",MROOT,PDL::GSL::MROOT]);
%hash = pdlpp_stdargs_int(@::pack);
$hash{INC} .= " $GSL_includes";
push @{$hash{LIBS}},$GSL_libs;
WriteMakefile(%hash);
sub MY::postamble {
pdlpp_postamble_int(@::pack);
} # Add genpp rule