From: tsuraan <tsuraan@...>
Date: 2005-03-23T02:50:32+09:00
Subject: Re: stepping through arrays simultaneously


On Mar 21, 2005, at 10:04 PM, Csaba Henk wrote:

> On 2005-03-22, James Edward Gray II <james@grayproductions.net> wrote:
>>> times = [ '1', '2', '3', '4', '5']
>>> events = [ 'eat', 'sleep', 'eat', 'play', 'sleep' ]
>>>
>>> times.size.times { |cnt|
>>>   puts times[cnt] + ": " + events[cnt]
>>> }
>> Sure is.  You want Array#zip().
>
> There is also Array#transpose:
>
> [times, events].transpose.each { |t,e|
>   puts t + ":" + e
> }
>
> Or maybe:
>
> [times, events].transpose.each { |te|
>   puts te.join(":")
> }

Starting to remind me of Matlab :)  Is transpose a terribly expensive 
operation, compared with zip?  Maybe rdoc should list big-O expense for 
operations or something.

--jay