Hi,
I was going thru the Newbook today, and came upon a few
typos, as I read with a fine tooth comb. :-)
First, is there somewhere to report spelling and typo errors?
I already found 3 in the first few lessons. Where and how should they be
reported?
Also, this is a nit-pick, but it is confusing.
I was going thru the code example on node3.html , under the
section Twinkle, twinkle, little star.
<quote>
Twinkle, twinkle, little star.
Let's look at something else, we'll zoom in on a small piece of the image:
$section = $gal(337:357,178:198);
imag $section; # It's the bright star
</quote>
When I try to put the above code, (which runs fine in perldl ),
into a conventional Perl script, it won't run, and stops with an error
" syntax error at ./z line 18, near "$gal("
Global symbol "$section" requires explicit package name at ./z line 19, <DATA>
line 387.
Execution of ./z aborted due to compilation errors."
The script to generate the error is:
#!/usr/bin/perl
use warnings;
use strict;
use PDL;
use PDL::Graphics::PGPLOT;
my $a = rfits "m51_raw.fits";
my $flat = rfits "m51_flatfield.fits";
imag $flat;
<>;
my $gal = $a / $flat;
my $section = $gal(337:357, 178:198 );
imag $section; # It's the bright star
<>;
__END__
It's obvious that
my $section = $gal(337:357, 178:198 );
is not proper Perl code, but the question becomes
how many other exceptions are there?
The tutorial starts out by saying that the same code
can be used in perldl as in a conventional Perl script.
So, how much leeway is there between Perl syntax, and perldl syntax?
Thanks,
zentara
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