Sorting Arrays

zdog has asked for the wisdom of the Perl Monks concerning the following question:

Let's say I have the following array of arrays:

@array = (
        [ "array1name", "array1info", "array1num" ],
        [ "array2name", "array2info", "array2num" ],
        [ "array3name", "array3info", "array3num" ],
      );
[download]

Now, how can I sort the arrays within the array according to the value of 'array#num' in descending order.

Thanks in advance.

-- Zenon Zabinski

Comment on Sorting Arrays Download Code

Replies are listed 'Best First'.
Re: Sorting Arrays by nardo (Friar) on Jun 26, 2000 at 09:27 UTC
`@sorted = sort {@{$b}[2] cmp @{$a}[2]} @array;` [download]	[reply] [d/l]
RE: Re: Sorting Arrays by merlyn (Sage) on Jun 26, 2000 at 20:20 UTC
Nope. You're using an array slice `@x[$y]` where you really want an element `$x[$y]`. And as pointed out elsewhere, you're using `cmp` where you want `<=>`. -- Randal L. Schwartz, Perl hacker	[reply] [d/l] [select]
(zdog) Re: (2) Sorting Arrays by zdog (Priest) on Jun 26, 2000 at 10:51 UTC
Thanks for the help. And now that I think about it, I probably should have got it on my own, but when I go into unchartered territory (functions that I have never used before), my brain freezes. Thanks again. -- zdog (Zenon Zabinski) Go Bells!! 'ż'	[reply]
RE: RE: Re: Sorting Arrays by dumrats (Initiate) on Jun 26, 2000 at 12:59 UTC
if array#num is really a number, <=> might be a better option ... `@array = sort { $$a[2] <=> $$b[2] } @array;` [download] -- Greg McCarroll http://www.mccarroll.uklinux.net	[reply] [d/l]
Re: Re: Sorting Arrays by PhosphoricX (Sexton) on Apr 05, 2004 at 07:44 UTC
Thanks for the tip. I used this to sort my `array[][][]`. I was able to sort my list by an object property as follows: `@memory_blocks = sort {hex(${$b}[0][0]->address) <=> hex(${$a}[0][0]-> +address)} @memory_blocks;` [download] Hope that might help someone else who gets stuck. Thanks again!	[reply] [d/l] [select]


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