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README.pod  view on Meta::CPAN

 gplot( with => 'image',  sin(rvals(51,51)) );

Here the only given ndarray has dimensions (21,21). This is a 3D plot, so we are
exactly 2 ndarrays short. Thus, PDL::Graphics::Gnuplot generates an implicit
domain, corresponding to a 21-by-21 grid.

C<PDL::Graphics::Gnuplot> requires explicit separators between tuples
for different plots, so it is always clear from the arguments you pass
in just how many columns you are supplying. For example,
C<plot($a,$b)> will plot C<$b> vs. C<$a>.  If you actually want to
plot an overlay of both C<$a> and C<$b> against array index, you want
C<plot($a,{},$b)> instead.  The C<{}> is a hash ref containing a
collection of all the curve options that you are changing between
the two curves -- in this case, zero of them.

=head2 Images

PDL::Graphics::Gnuplot supports four styles of image plot, via the "with" curve option.

The "image" style accepts a single image plane and displays it using
the palette (pseudocolor map) that is specified in the plot options

lib/PDL/Demos/Gnuplot.pm  view on Meta::CPAN

  $w->plot( {tit=>'Default color map'},             with=>'image', $im );
  $w->plot( {tit=>'Grayscale',      clut=>'gray'},  with=>'image', $im );
  $w->plot( {tit=>'heat map',       clut=>'heat1'}, with=>'image', $im );
  $w->plot( {tit=>'3d perspective', trid=>1},       with=>'pm3d',  $im );
  $w->end_multi;

|],

[act => q|
  # You can indpendently specify color and position on surface plots,
  # and can overlay multiple types of plot -- even in 3D.
  #
  $rv = rvals(101,101)/5;             $im = cos($rv)/($rv+2.5);
  $grad = sumover $im->range([[-1,0],[1,0]],[$im->dims],'e') * pdl(-1,1);

  $im2 = $im->indexND(ndcoords(26,26)*4);  # subsample $im

  $w->reset;
  $w->options( trid=>1,   hidden=>'front',  colorbox=>0,  clut=>'heat1'  );

  $w->multiplot(layout=>[2,2]);

lib/PDL/Graphics/Gnuplot.pm  view on Meta::CPAN

 gplot( with => 'image',  sin(rvals(51,51)) );

Here the only given ndarray has dimensions (21,21). This is a 3D plot, so we are
exactly 2 ndarrays short. Thus, PDL::Graphics::Gnuplot generates an implicit
domain, corresponding to a 21-by-21 grid.

C<PDL::Graphics::Gnuplot> requires explicit separators between tuples
for different plots, so it is always clear from the arguments you pass
in just how many columns you are supplying. For example,
C<plot($a,$b)> will plot C<$b> vs. C<$a>.  If you actually want to
plot an overlay of both C<$a> and C<$b> against array index, you want
C<plot($a,{},$b)> instead.  The C<{}> is a hash ref containing a
collection of all the curve options that you are changing between
the two curves -- in this case, zero of them.

=head2 Images

PDL::Graphics::Gnuplot supports four styles of image plot, via the "with" curve option.

The "image" style accepts a single image plane and displays it using
the palette (pseudocolor map) that is specified in the plot options