in reply to Simple? problem accesssing elements in a hash

I don't see any obvious errors in your code. When %PCA is populated correctly, maybe @line doesn't contain what you think it does?

(You can also simplify your last line to read my @pos = @PCA{@lines};, see perldata for details).

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Re^2: Simple? problem accesssing elements in a hash
by 0AP0 (Initiate) on Aug 29, 2008 at 10:58 UTC

    I found the error. Being told that it didn't look like a code problem and more like an input problem helped.

    It was in the initialization of the PCA hash the keys, instead of being numbers, had quotation marks around them.

[reply]
      and the general answer for this is:
      debug.
      print out variables, if you're not sure what's in it.
      and even if you're sure. 
      use Data::Dumper;
$Data::Dumper::Useqq = 1; # print non-printable chars
warn Dumper $blackbox;

      [download]
[reply]
[d/l]
        I agree. Strings appearing with quotes around them are sneaky ones, though. In this case the answer was more obvious looking at the input files than the output statements.
[reply]

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