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re: simple (not for me) operation on matrix


From: Riccardo Bernardini
Subject: re: simple (not for me) operation on matrix
Date: Tue, 13 May 2003 17:35:13 +0200

> hi *
> 
> ive a big matrix (750 cols* 140 rows) for example:
> 
> 1 2 3 2 4 5 6
> 3 4 6 5 3 2 1
> 2 4 5 6 7 8 8
> 6 7 5 4 3 2 1
> 
> i need to obtain a new matrix where i sum line 1 and line 2, then line 3
> and line 4 and so on as:
> 
> (1+3) (2+4)
> (2+6) (4+7)
> 
> i'm coming crazy for such a simple thing, any idea ?

If M is your 750x140 matrix, just do

   result = M(1:2:size(M,1), :) + M(2:2:size(M,1), :) 

----------------------------------------------------------------------
Riccardo Bernardini
Dipartimento di Ing. Elettrica, Gest. e Mec.
via delle Scienze 208
33100 Udine (Italy)

e-mail: address@hidden

Tel. +39-0432-55-8271
Tel. +39-0432-55-8251



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