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matlabsumsubmatrix
Daniel Luna
Daniel Luna

Reputation: 23

Adding two submatrices in Matlab?

I have a 5x5 matrix M = magic(5)and I must add two sub-matrices of it (using thesumcommand) and store it inG`, they are:

M(1:3,1:3) and M(3:5,3:5)

And I wrote this, but I', not sure if it's correct,

G=sum(M([1:3,1:3],[3:5,3:5]));

Upvotes: 1

Views: 109

Answers (1)

Rash
Rash

Reputation: 4336

As mentioned in comments, you could easily accomplish your goal with +.

 M = magic(5);
 A = M(1:3,1:3);
 B = M(3:5,3:5);
 G = A + B;

It could get a little complicated if you want to use sum,

C(:,:,1) = A;
C(:,:,2) = B;
G = sum(C,3);

Upvotes: 3

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