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How do I sort into an index?

by Monolith-0 (Beadle)
on Feb 23, 2001 at 11:04 UTC ( #60442=categorized question: print w/replies, xml ) Need Help??
Contributed by Monolith-0 on Feb 23, 2001 at 11:04 UTC
Q&A  > sorting


I want to get the sorted order of a list of values, but not change the original list. I have an index array in which I wish keep track of the values' sorted order.

For example... start with:

@stuff_list = ( 'b','t','e','s','u','i' ); @list_order = ( 0 , 1 , 2 , 3 , 4 , 5 );
then sort and get:
@stuff_list = ( 'b','t','e','s','u','i' ); @list_order = ( 0 , 2 , 5 , 3 , 1 , 4 );
And then use @list_order to access the actual values.

Answer: How do I sort into an index?
contributed by Monolith-0

@list_order = sort { $stuff_list[$a] cmp $stuff_list[$b] } 0 .. $#stuf +f_list;
Then you can do stuff like the following to see the results:
for my $i ( 0 .. $#list_order ) { print "$stuff_list[$list_order[$i]]\n"; }
print join( "\n", @stuff_list[@list_order] ), "\n";

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