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Re: cat does not convert sparse matrices?


From: dbateman
Subject: Re: cat does not convert sparse matrices?
Date: Sun, 14 Sep 2008 15:17:54 +0200
User-agent: Mutt/1.5.13 (2006-08-11)

On Sat, Sep 13, 2008 at 03:24:54PM +0200, Francesco Potorti` wrote:
> Should they really be?  This is the first step of a loop where I build a
> 3d matrix by catenating 2d matrices on the 3rd dim, like this:
> 
> a=zeros(3,3,0);
> for z=1:Z
>     b=rand(3,3);
>     a=cat(3,a,b);
> endfor
> 
> if cat() dropped the trailing singleton dimension, would this loop keep
> working?


They are automatically added again if needed, as if they weren't 
something like

cat (3, rand(2,2), rand(2,2))

would not work either

D.


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