From: rashworth <rashworth@...>
Date: 2001-05-02T11:15:58+09:00
Subject: [ruby-talk:14529] Re: Large Matrix

Thanks for your note. Dave also wrote and said:

my_array = (1..50).map { (1..50.map { '+' } }
my_array[2][2] = "a"
puts my_array.collect {|row| row.join }

This works fine.  Thanks again.

ERA

---------- Original Message ----------------------------------
From: Mark Slagell <ms@iastate.edu>
Reply-To: ruby-talk@ruby-lang.org
Date: Tue, 1 May 2001 12:56:28 +0900

>rashworth spake:
>> 
>> The map works fine, but I am not able to redefine
>> map[2][2] = "a"  ? and then print map
>
>Redefining an element should work.  Are you giving a name to the matrix?
>e.g.,
>
>  myMatrix = (1..50).map { (1..50).map { '+' } }
>
>Then myMatrix[2][2] = 'a' would redefine that element of the matrix. 
>See, umm, I think you don't want to be calling the matrix 'map'.  You
>could, but it sounds potentionally bad for your karma, confusing an
>action (map) with the result of that action (the matrix it gives you).
>
>As for printing, I'm not sure what you have in mind.
>
>  -- M
>
> 
>> ---------- Original Message ----------------------------------
>> From: Dave Thomas <Dave@PragmaticProgrammer.com>
>> Reply-To: ruby-talk@ruby-lang.org
>> Date: Tue, 1 May 2001 12:07:48 +0900
>> 
>> >"rashworth" <rashworth@mail.warpnet.net> writes:
>> >
>> >> What is the Ruby code to define a large matrix, 50 by 50
>> >> elements with each one equal to "+"?  Thank you.  ERA
>> >
>> >    (1..50).map { (1..50).map { '+' }  }
>