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Re: confused with summing certain elements from an array

by erroneousBollock (Curate)
on Nov 20, 2007 at 12:45 UTC ( #651913=note: print w/ replies, xml ) Need Help??


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; }
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;

-David


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Re^2: confused with summing certain elements from an array
by GrandFather (Cardinal) 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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