How to slide a smaller matrix over larger matrix and employ element wise multiplication?

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maaham banu 2020-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/506329-how-to-slide-a-smaller-matrix-over-larger-matrix-and-employ-element-wise-multiplication

评论： maaham banu 2020-2-19

I have one matrix of THETA_F1 which is 512x509 and THETA_F2 256x321. I want to slide the smaller matrix over the larger one and multiply them and store the values in another matrix and then plot them.

The error I am facing is that matrix dimensions do not agree. Rows and Coloumns is basically the size of THETA_F1

for i=1:3:rows
    for j=1:3:coloumns
        corr = THETA_F1.*THETA_F2;
    end
end

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Walter Roberson 2020-2-19

You would be getting out (512-256+1) * (509-321+1) = 257*189 = 48573 different matrices of results, each 256 x 321. What kind of plotting presentation were you thinking of doing that could represent nearly 50000 different arrays that size? How large of a display do you have, exactly? When I looked up the largest known display in the world about a year ago, it was about 10000 times too small to plot all of that at the same time.

maaham banu 2020-2-19