Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?
 
PerlMonks  

How do I create a matrix?

( #86482=categorized question: print w/ replies, xml ) Need Help??
Contributed by eyal_kle on Jun 07, 2001 at 11:49 UTC
Q&A  > arrays


Description:

How do I create a matrix? is it @@matrix?

Answer: How do I create a matrix?
contributed by jeffa

Heh, close. :)
The trick is to use an array of array references:

my @matrix = ( [qw(0 0 0 0)], [qw(0 0 1 0)], [qw(0 1 0 0)], [qw(1 0 0 0)], ); foreach my $row (@matrix) { print join(":",@$row), "\n"; } # qw(1 0 0 0) is better way of saying (1,0,0,0)
Answer: How do I create a matrix?
contributed by Beatnik

You can use PDL::Matrix

#!/usr/bin/perl -w use strict; use PDL::Matrix; my $m = pdl [ [1,2,3], [4,5,6], [7,8,9] ];
Which then also allows you to perform clean, fast math on them.
my $m = pdl [ [1,2,3], [4,5,6], [7,8,9] ]; my $n = pdl [ [1,0,0], [0,1,0], [0,0,1] ]; my $r = $m x $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
  • 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 drinking their drinks and smoking their pipes about the Monastery: (18)
    As of 2015-07-31 21:15 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 (282 votes), past polls