Beefy Boxes and Bandwidth Generously Provided by pair Networks
good chemistry is complicated,
and a little bit messy -LW
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

Is this sort of what you had in mind?

The Code

#!/usr/bin/env perl use 5.014; use warnings; my %kw; # $kw{kw}->{name} = Number of times kw appears in name.txt my %name; # Inverse of %kw; $name{name}->{keyword} read_words() for <*.txt>; # Now we can do all sorts of useful things with the two hashes: say "$_ has " . (keys $name{$_}) . " unique words" for sort keys %name +; say ''; # Keywords ordered by occurrence count for my $kw (sort { keys $kw{$b} <=> keys $kw{$a} } keys %kw) { my $count = keys $kw{$kw}; printf "%10s appears in %2d file%s: %s\n", $kw, $count, $count > 1 ? 's' : ' ', join(', ', sort keys %{$kw{$kw}}); } # Pull in the word lists. sub read_words { open my $fh, '<', $_ or die "Can't open $_: $!"; my $name = s/\.txt$//r; while (<$fh>) { chomp; $kw{$_}->{$name}++; $name{$name}->{$_}++; } close $fh; }

Input

Reads all *.txt files in the current directory. Each text file is expected to contain exactly one keyword per line. For example:

al.txt: abel abel baker camera delta edward fargo golfer jerky

Output

al has 8 unique words bob has 7 unique words carmen has 6 unique words don has 3 unique words ed has 3 unique words fargo appears in 5 files: al, bob, carmen, don, ed jerky appears in 4 files: al, carmen, don, ed icon appears in 3 files: carmen, don, ed golfer appears in 3 files: al, bob, carmen edward appears in 2 files: al, bob camera appears in 2 files: al, bob delta appears in 2 files: al, bob hilton appears in 2 files: bob, carmen baker appears in 2 files: al, bob kappa appears in 1 file : carmen abel appears in 1 file : al

Efficiency

Memory: O(2nc) where n is the number of unique keywords, and c is the keyword length.

Execution: Most operations become near-O(1) (constant time), including counting number of keywords. Obviously looping to display each keyword as I have done will incur n total lookups; this is the best possible order.


In reply to Re: compare a list against multiple lists by rjt
in thread compare a list against multiple lists by raiten

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • 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
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            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 rifling through the Monastery: (6)
    As of 2015-07-05 08:46 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (61 votes), past polls