From help-request at octave dot org Tue May 11 13:28:38 2004
Subject: Re: Help filling a matrix
From: "Mark P. Esplin" <mark at srl-sdl dot org>
To: "Ryan Peterson" <petersonryanace at hotmail dot com>, help@octave.org
Date: Tue, 11 May 2004 14:26:10 -0400

Thanks,

	I think reshape will give me what I want.  I did want to fill the the whole 
matrix and not just the diagonal.  Sorry my example was missleading.

                                         -Mark Esplin

On Tuesday 11 May 2004 10:52, you wrote:
> I think this should do it:
>
> z2d=reshape(z,n,n);
>
> But... in your example you're only filling the main diaganol so it's
> doubtful that reshape would be faster.  Is this what you want?
>
> regards,
> ryan peterson
>
>
>
> From: "Mark P. Esplin" <mark at srl-sdl dot org>
>
> >To: help at octave dot org
> >Subject: Help filling a matrix
> >Date: Tue, 11 May 2004 10:12:34 -0400
> >
> >	I have the data that will make a gray scale image in three separate 1-D
> >arrays, x, y, z.  The value of the i'th pixel is z(i) with the x and y
> >corrdinates in x(i), and y(i).   The following does what I want, but is
> >there
> >a way of doing it without a loop?
> >
> >n = length(x);
> >z2d = zeros(n,n);
> >for i=1:n
> >         z2d(x(i),y(i)) = z(i);
> >endfor
> >
> >                  -Mark Esplin
> >
> >
> >
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