I want to add a 20 by 20 matrix to a 50 by 50 matrix ? the resuting matrix should be of 50 by 50 .

2015 2 26
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更新时间：2015 2 26
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For Example : A=5*ones(50) & B=2*ones(20) , how should A+B be evaluated ?

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Guillaume
Guillaume 2015-2-26
You tell us how it should be evaluated since it makes no sense mathematically.
Possibly you want to pad the smaller matrix with 0, only you knows.
Amir
Amir 2015-2-26
Mr. Raghavendra did right what i wanted ! But ur question was also in my mind to pad zeros with the smaller matrix. How would u do it
Guillaume
Guillaume 2015-2-26
Exactly, the way Raghavendra did it, or using padarray if you have the imaging toolbox.

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Jos (10584)
Jos (10584) 2015-2-26

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For arbitrary sized 2D matrices A and B:
% example data
A = ones(3,5)
B = 2*ones(4,2)
% engine
szA = size(A)
szB = size(B)
C = zeros(max([szA ; szB]))
C(1:szA(1),1:szA(2)) = A
C(1:szB(1),1:szB(2)) = C(1:szB(1),1:szB(2)) + B

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