Beefy Boxes and Bandwidth Generously Provided by pair Networks
Syntactic Confectionery Delight
 
PerlMonks  

How do I find the percentage of similarity between strings?

( #162038=categorized question: print w/ replies, xml ) Need Help??
Contributed by Superman on Apr 25, 2002 at 17:01 UTC
Q&A  > strings


Description:

I have 2 strings which should be identical:
$PDBline; $XMLline;
and I test for this normally:
if ($PDBline eq $XMLline){etc...}
However in the event that they dont match I want to do a percentage comparison where I match each word in $PDBline against the words in $XMLline.

So say I want a 75 % similarity between the 2 strings...

my $threshold = 0.75; my $counter = 0; foreach my $word ( split ' ', $PDBline ) { $counter++ if $XMLline =~ /$word/; }
Does this seem right or is there an easier way to do this??

Answer: How do I find the percentage of similarity between strings?
contributed by I0

use String::Approx 'adistr';

Answer: How do I find the percentage of similarity between strings?
contributed by The Mad Hatter

String::Approx is good as someone else said. So is Text::Levenshtein. With the values you can get from both modules, you should be able to do some math to get a percentage.

You might also want to read Levenshtein distance: calculating similarity of strings.

Answer: How do I find the percentage of similarity between strings?
contributed by chicks

I'm personally quite fond of Algorithm::Diff. It's line-oriented and you asked for word-oriented, so it might not work for what you're trying to do precisely.

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
  • 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 surveying the Monastery: (5)
    As of 2015-07-07 03:37 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 (86 votes), past polls