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Re: Excluding elements of a matrix (Joseph Wakeling)


From: Joseph Wakeling
Subject: Re: Excluding elements of a matrix (Joseph Wakeling)
Date: Mon, 25 Dec 2006 20:31:41 +0100
User-agent: Thunderbird 1.5.0.8 (X11/20061115)

Alexander Barth wrote:
> An alternative way, is to do
> 
> octave:2> A = magic(4)
> A =
> 
>    16    2    3   13
>     5   11   10    8
>     9    7    6   12
>     4   14   15    1
> 
> octave:3> A(1:end ~= 2,:)
> ans =
> 
>    16    2    3   13
>     9    7    6   12
>     4   14   15    1

That's a nice way.  Is there a comparable way of subtracting _several_
elements?  Your method works in 2.1.73 but trying e.g. A(1:end~=[2 3],:)
doesn't (for obvious reasons since you can't compare a number to a
vector for equality...).

Season's greetings to all. :-)


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