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Re^2: Some Basic Help.

by invaderzard (Acolyte)
on Sep 25, 2012 at 07:14 UTC ( #995500=note: print w/ replies, xml ) Need Help??


in reply to Re: Some Basic Help.
in thread Some Basic Help.

What can you tell me about hashes? Thanks.


Comment on Re^2: Some Basic Help.
Re^3: Some Basic Help.
by Jenda (Abbot) on Sep 25, 2012 at 08:06 UTC

    Here's a quick intro.

    In your case you would not have any values in the hash, just keys. You'd read the smaller file and add the lines to a hash as keys (the values are irrelevant, use 1 for example). Then as you would read the other file you'd just check whether exists $hash{$line} and you'd know right away whether such line was in the first file or not.

    Jenda
    Enoch was right!
    Enjoy the last years of Rome.

      How do I then, get the data i want into the array?
      use Modern::Perl open trained , 'D://ARP//libsvm-3.12//families//antioxidant//independe +nt.scale'; open predict , 'D://ARP//libsvm-3.12//families//antioxidant//testing.s +cale'; my $counter = 0; my $lol = 0; select trained; my @train = $_; while (<predict>) { #print $_; my $predict = $_; if (exists $train{$predict} { print $predict; $counter = $counter + 1 } } print $counter;

      like this?

        First by reading some docs. Random typing will not work!

        What's the $lol variable for? Why do you select() a filehandle opened for reading? What do you think will be in $_ on line 7? You declare array @train, but later on attempt to use hash %train!

        Jenda
        Enoch was right!
        Enjoy the last years of Rome.

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