Matrix Manipulation
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Hi,
From the following matrix:
A = [1; 1; 3; 1; 2; 1; 1; 1; 3; 1; 1; 1; 1; 2; 1; 1; 1; 1; 1; 3; 1; 1; 1; 2; 1; 1; 1; 1; 1; 2; 2; 1; 1; 1; 2; 1; 1; 2; 1; 1; 1; 1; 1; 1; 3; 1; 1; 3; 2; 1; 1; 1; 1; 1; 1; 1; 2; 2; 4; 1; 1; 2; 1; 1; 1; 1; 2; 2; 1; 1; 1; 3]
I want a matrix of (row numbers minus one) where A is greater than 1. Also, if the element in A is 2 for example then B for that element in A will record the (row numbers minus one) once, if it was a 3 then just twice, and so on; therfore B will look like:-
B = [2, 2, 4, 8, 8, 13, 19, 19,....., 71, 71]
Thanks, any help will be great!
0 commentaires
Réponse acceptée
Paulo Silva
le 8 Sep 2011
A = [1; 1; 3; 1; 2; 1; 1; 1; 3; 1; 1; 1; 1; 2; 1; 1; 1; 1; 1; 3; 1; 1; 1; 2; 1; 1; 1; 1; 1; 2; 2; 1; 1; 1; 2; 1; 1; 2; 1; 1; 1; 1; 1; 1; 3; 1; 1; 3; 2; 1; 1; 1; 1; 1; 1; 1; 2; 2; 4; 1; 1; 2; 1; 1; 1; 1; 2; 2; 1; 1; 1; 3];
a1=find(A==2)-1; %find the index of the 2
a2=find(A==3)-1; %find the index of the 3
a2=repmat(a2,2,1) %duplicate the 3 indexes
B=sort([a1;a2])'; %join and sort the solution, also transpose
%I transposed B because of your B example
3 commentaires
Paulo Silva
le 8 Sep 2011
it was on purpose, that way you need to understand my code and add your code to it ;)
Plus de réponses (1)
Amandeep
le 8 Sep 2011
1 commentaire
Andrei Bobrov
le 8 Sep 2011
A1=A-1;
[i1,~,v]=find(A1)
B = cell2mat(arrayfun(@(x,y)x*ones(1,y),i1'-1,v','un',0))
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