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From: | Robert T. Short |
Subject: | Re: Ignorance |
Date: | Tue, 06 Mar 2012 09:46:26 -0800 |
User-agent: | Mozilla/5.0 (X11; Linux i686; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2 |
On 03/05/2012 07:34 PM, John W. Eaton wrote:
Excellent. The kind of thing I was looking for was the indexing solution. Using kron, outer product, sums, broadcasting involve computation so I would rather not use them for something like this. Thanks for the tips.On 5-Mar-2012, Robert T. Short wrote: | I don't know the dimensions or the direction a-priori. The obvious | answer is 1:N followed by a repmat but there are so many cute little | octave tricks that I was hoping there was something really clever. Given x = 1:4; y = ones (3, 1); z = ones (3, 4); here are the ways I can think of: Repmat: repmat (x, [3,1]) Kron: kron (x, y) Indexing: x(y,:) Outer product: y * x Broadcasting: z .* x Are there any others? jwe
Bob
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