Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked
 
PerlMonks  

How do I sort into an index?

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


Description:

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"; }
or
print join( "\n", @stuff_list[@list_order] ), "\n";

Please (register and) log in if you wish to add an answer



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others musing on the Monastery: (7)
    As of 2014-09-19 06:06 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      How do you remember the number of days in each month?











      Results (131 votes), past polls