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Re: adding vectors and matrices

From: Ted Harding
Subject: Re: adding vectors and matrices
Date: Fri, 22 Aug 1997 10:22:20 +0100 (GMT+0100)

( Re Message From: Andreas Heitmann )
> I'm using octave for some time now, but I'm still wondering if there
> is a simple way to add a fixed column vector to a number of other
> column vectors stored in a matrix. Currently i'm using a loop like the
> following:
>       v=[1;2;3];
>       for i=1:columns(x)
>               y(:,i)=x(:,i)+v;
>       endfor
> Is it possible to compute y without a loop statement?


      y = x + v*ones(1,columns(x));

will do it. I understand John Eaton plans to incorporate a syntax like

      y = x .+ v

for a future release which will do the same thing (and the corresponding
thing if v is a row vector with as many elements as x has columns, i.e.
add v to each row of x).

Best wishes,
Ted.                                    (address@hidden)

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