lib/Math/GSL/Interp/Test.pm

   1 package Math::GSL::Interp::Test;
   2 use Math::GSL::Test qw/:all/;
   3 use base q{Test::Class};
   4 use Test::More;
   5 use Math::GSL::Interp qw/:all/;
   6 use Math::GSL::Errno qw/:all/;
   7 use Math::GSL qw/:all/;
   8 use Data::Dumper;
   9 use strict;
  10
  11 sub make_fixture : Test(setup) {
  12 }
  13
  14 sub teardown : Test(teardown) {
  15 }
  16
  17 sub GSL_INTERP_ALLOC : Tests {
  18  my $I = gsl_interp_alloc($gsl_interp_linear, 2);
  19  isa_ok($I, 'Math::GSL::Interp');
  20 }
  21
  22 sub GSL_INTERP_INIT : Tests {
  23
  24 }
  25 sub GSL_INTERP_BSEARCH : Tests {
  26   my $x_array = [ 0.0, 1.0, 2.0, 3.0, 4.0 ];
  27
  28   # check an interior point
  29   my $index_result = gsl_interp_bsearch($x_array, 1.5, 0, 4);
  30   is($index_result, 1);
  31
  32   # check that we get the last interval if x == last value
  33   $index_result = gsl_interp_bsearch($x_array, 4.0, 0, 4);
  34   is($index_result, 3);
  35
  36   # check that we get the first interval if x == first value
  37   $index_result = gsl_interp_bsearch($x_array, 0.0, 0, 4);
  38   is($index_result, 0);
  39
  40   # check that we get correct interior boundary behaviour
  41   $index_result = gsl_interp_bsearch($x_array, 2.0, 0, 4);
  42   is($index_result, 2);
  43
  44   # check out of bounds above
  45   $index_result = gsl_interp_bsearch($x_array, 10.0, 0, 4);
  46   is($index_result, 3);
  47
  48   # check out of bounds below
  49   $index_result = gsl_interp_bsearch($x_array, -10.0, 0, 4);
  50   is($index_result, 0);
  51 }
  52
  53 sub MULTIPLE_TESTS : Tests {
  54   my $a = gsl_interp_accel_alloc ();
  55   my $interp = gsl_interp_alloc ($gsl_interp_polynomial, 4);
  56   my $data_x = [ 0.0, 1.0, 2.0, 3.0 ];
  57   my $data_y = [ 0.0, 1.0, 2.0, 3.0 ];
  58   my $test_x = [ 0.0, 0.5, 1.0, 1.5, 2.5, 3.0 ];
  59   my $test_y = [ 0.0, 0.5, 1.0, 1.5, 2.5, 3.0 ];
  60   my $test_dy = [ 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 ];
  61   my $test_iy = [ 0.0, 0.125, 0.5, 9.0/8.0, 25.0/8.0, 9.0/2.0 ];
  62
  63   gsl_interp_init ($interp, $data_x, $data_y, 4);
  64   for my $i (0.. 3) {
  65     my $x = $test_x->[$i];
  66     my ($s1, $y) = gsl_interp_eval_e ($interp, $data_x, $data_y, $x, $a);
  67     my ($s2, $deriv) = gsl_interp_eval_deriv_e ($interp, $data_x, $data_y, $x, $a);
  68     my ($s3, $integ) = gsl_interp_eval_integ_e ($interp, $data_x, $data_y, $test_x->[0], $x, $a);
  69
  70     ok_status($s1);
  71     ok_status($s2);
  72     ok_status($s3);
  73
  74      ok_similar([$y, $deriv, $integ], [$test_y->[$i], $test_dy->[$i], $test_iy->[$i]], "eval_e, derive_e and integ_e",1e-10);
  75
  76      my $diff_y = $y - $test_y->[$i];
  77      my $diff_deriv = $deriv - $test_dy->[$i];
  78      my $diff_integ = $integ - $test_iy->[$i];
  79      ok( abs($diff_y) < 1e-10, "diff_y");
  80      ok( abs($diff_deriv) < 1e-10, "diff_deriv");
  81      ok( abs($diff_integ) < 1e-10, "diff_integ");
  82     }
  83   gsl_interp_accel_free ($a);
  84   gsl_interp_free ($interp);
  85 }
  86 1;