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From: | David Bateman |
Subject: | Re: resize |
Date: | Wed, 30 Jul 2008 18:13:38 +0200 |
User-agent: | Thunderbird 2.0.0.16 (X11/20080725) |
Francesco Potorti` wrote:
It seems to do what it says it does to me.. That is in your example it takes a 12x1 matrix and converts it to a 3x4 matrix keeping the overlapping parts of the matrix assuming that the [0,0] index is the same.What does the resize function do? Its help string makes one think that it does the same as reshape, only in place: -- Built-in Function: resize (X, M, N) Destructively resize X. *Values in X are not preserved as they are with `reshape'.* If only M is supplied and it is a scalar, the dimension of the result is M-by-M. If M is a vector, then the dimensions of the result are given by the elements of M. If both M and N are scalars, then the dimensions of the result are M-by-N. See also: reshape. However, it does not do that: octave> resize((1:3*4)',[3 4]) ans = 1 0 0 0 2 0 0 0 3 0 0 0 Is it a sort of truncation?
The original reason this function was created was that some user types might have additional attributes associated with them and so a zeros(m,n) couldn't be used in many functions, but a resize(resize (x, 0, 0), m, n) could and keep the attributes of x. An example is the primitive polynomial of a galois field user type.
Regards David -- David Bateman address@hiddenMotorola Labs - Paris +33 1 69 35 48 04 (Ph) Parc Les Algorithmes, Commune de St Aubin +33 6 72 01 06 33 (Mob) 91193 Gif-Sur-Yvette FRANCE +33 1 69 35 77 01 (Fax) The information contained in this communication has been classified as: [x] General Business Information [ ] Motorola Internal Use Only [ ] Motorola Confidential Proprietary
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