Extract columns in a loop
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Francis Herman
le 19 Sep 2017
Réponse apportée : Walter Roberson
le 19 Sep 2017
Hello, I am trying to extract every 2000 rows in a 20000 row column and place each extracted matrix into a separate column to create a 2000x10 matrix. However, I am getting an error: In an assignment A(:) = B, the number of elements in A and B must be the same. Any ideas?
Test=zeros(2000,10);
for w=1:10
Test(w)=zt3((2000.*(w-1))+1:2000.*w,1:1)
end
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OCDER
le 19 Sep 2017
Modifié(e) : OCDER
le 19 Sep 2017
Is this what you want to do?
zt3 = [1:20000]'; %assuming zt3 is a 20000x1 matrix
Test = reshape(zt3, 2000, 10);
%Takes row 1:2000, 2001:4000, etc and stores each in a column in a new matrix.
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OCDER
le 19 Sep 2017
You're welcome! Oh, I should have explained why your code didn't work. You were doing Test(w) = zt3(1:2000), but Test(w) is 1 element while zt3(1:2000) is 2000 elements. The elements must match in input and output. To make the for loop work, you'd have to fix it as below:
Test = zeros(2000, 10);
for w = 1:10
Test(:, w) = zt3(2000*(w-1)+1:2000*w, 1);
%Fill all row " : " for column number w in Test
end
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Walter Roberson
le 19 Sep 2017
T = mat2cell(zt3, 2000*ones(1,size(zt3,1)/2000), size(zt3,2));
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