Re: confused with summing certain elements from an array


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Re: confused with summing certain elements from an array

by erroneousBollock (Curate)

on Nov 20, 2007 at 12:45 UTC ( [id://651913]=note: print w/replies, xml )

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in reply to confused with summing certain elements from an array

I want to make a hash contains as keys the unique elements from the @out and as values the sums of the letters from the @out1. Also I want the hash to be sorted

You can do this:

  my %counts;
  while (my $key = shift @out) {
    $counts{$key} += shift @out1;
  }
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That looks silly to me though... why would the data be in parallel arrays to begin with?

Also I want the hash to be sorted

Hashes aren't sorted.

You can iterate the keys of the hash in order as follows:

  print "$_: \t$counts{$_}\n" for sort keys %counts;
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-David

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Re^2: confused with summing certain elements from an array
by GrandFather (Saint) on Nov 20, 2007 at 19:56 UTC

The data are in parallel arrays because that is how the designer of the homework specified the problem. ;)

Perl offers several ways of managing data in that fashion and I expect there may be discussion of the pros and cons of each following the submission of answers. I'd hope too that your point is made - that is not a Perlish way to manage data in most cases.

Perl is environmentally friendly - it saves trees

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