The M51 fits data is distributed with the PDL distribution. (It is the
rare exceptional piece of data that is distributed with PDL.) I wrote
a small module to retrieve it, once upon a time. I've dusted it off:
---------------%<---------------
package PDL::M51;
use strict;
use warnings;
# Include this to make Perl search for us:
use PDL::Demos::General;
# Get the full path to the General.pm module just loaded
#my ($k, $v);
#print "$k => $v\n" while ($k, $v) = each %INC;
my $path = $INC{'PDL/Demos/General.pm'};
$path =~ s/General.pm/m51.fits/;
sub get {
return $path;
}
1;
--------------->%---------------
This will create the function PDL::M51::get, which will return the
path to the fits file. You can then load the fits file with rfits and
roll on from there.
However, Karl's flatfield file (and the modified M51 file) used in the
book are not distributed with PDL, so maybe we should still have links
for those. Or, Joel had a concept for a CPAN distribution that focused
on distributing PDL data (PDL::UserData?). These would be great
candidates for that module.
I've been meaning to propose this for inclusion with PDL for some time
but, you know, I've had other things on my mind. Would anybody like to
see this module added to PDL? Should I document and test it?
David
On Sun, Sep 9, 2012 at 1:26 PM, Luis Mochan <[email protected]> wrote:
> The PDL-Book has a very nice example of pdl's image manipulation
> capabilities using m51. It would be nice to include a link to the m51
> images so the reader can reproduce the exercises (it has the path to
> the images within the book directory, but it would be unable for
> those that only downloaded the pdf version instead of cloning the git
> repository)
>
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--
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." -- Brian Kernighan
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