Re^2: How to swap rows with columns?


Keep It Simple, Stupid
	PerlMonks

Re^2: How to swap rows with columns?

by snopal (Pilgrim)

on Oct 09, 2007 at 21:38 UTC ( [id://643806]=note: print w/replies, xml )

Need Help??

in reply to Re: How to swap rows with columns?
in thread How to swap rows with columns?

Isn't this so much easier to understand?

#!/usr/bin/perl
use warnings;
use strict;

my @in = ([1,2,3,4,'a','b','c'],
          ['z','y','x','w',9,8,7],
          ['e','f','g','h',5,4,6],
          );
my @out;

for my $y (0..(@in-1)) {
    for my $x (0..(@{$in[$y]}-1)) {
        $out[$x][$y] = $in[$y][$x];
    }
}
[download]

No need to be a Perl geek to do this right! And think of the ease of maintenance!

Comment on Re^2: How to swap rows with columns? Download Code

Replies are listed 'Best First'.
Re^3: How to swap rows with columns? by johngg (Canon) on Oct 09, 2007 at 22:11 UTC
`for my $y (0..(@in-1)) { for my $x (0..(@{$in[$y]}-1)) {` [download] I'm puzzled as to why you do the subtractions to find the upper bound of the arrays rather than use the `$#array` that Perl provides. `for my $y ( 0 .. $#in ) { for my $x ( 0 .. $#{$in[$y]} ) {` [download] Cheers, JohnGG	[reply] [d/l] [select]
Re^4: How to swap rows with columns? by snopal (Pilgrim) on Oct 10, 2007 at 02:14 UTC
My original did, but the second loop definition was looking like line noise and I was demonstrating the practice to a novice. So I opted for the more verbose, and less obtuse example.	[reply]

In Section Seekers of Perl Wisdom

Domain Nodelet^?

www.com | www.net | www.org

Node Status^?

node history
Node Type: note [id://643806]
help

Chatterbox^?

How do I use this? • Last hour • Other CB clients

Other Users^?

Others studying the Monastery: (4)

As of 2024-04-19 03:56 GMT

Sections^?

Information^?

Find Nodes^?

Leftovers^?

Today I Learned

Voting Booth^?

No recent polls found