How to calculate max multiplication possibility of three adjacent numbers in 10*10 matrix?

Question

Asrorkhuja Ortikov 2020-8-17

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https://ww2.mathworks.cn/matlabcentral/answers/580527-how-to-calculate-max-multiplication-possibility-of-three-adjacent-numbers-in-10-10-matrix

评论： Asrorkhuja Ortikov 2020-8-17

I have a matrix of 10 to 10 size of random digits from 0 to 9. How to calculate possible max multiplication of three adjacent numbers in matrix? I would like to consider only vertical and horizontal adjacent numbers, not diagonal.

r = randi([0 9],10,10);

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Answer 1

Bruno Luong 2020-8-17

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https://ww2.mathworks.cn/matlabcentral/answers/580527-how-to-calculate-max-multiplication-possibility-of-three-adjacent-numbers-in-10-10-matrix#answer_480984

在 MATLAB Online 中打开

% Test matrix
A=randi([0 9],10,10)
B=cat(3,movprod(A,3,1),movprod(A,3,2));
[maxB,imax]=max(B,[],'all','linear');
[i,j,k]=ind2sub(size(B),imax);
if k==1
    i=max(i-1,1):min(i+1,size(A,1));
    j=j+zeros(size(i));
else
    j=max(j-1,1):min(j+1,size(A,2));
    i=i+zeros(size(j));
end
ilin = sub2ind(size(B),i,j);
% Display the adjadcent elements
fm1 = repmat('A(%d,%d)*', 1, length(i));
fm1(end) = [];
fm2 = repmat('%d*', 1, length(i));
fm2(end) = [];
fprintf(['%d = ' fm1 ' = ' fm2, '\n'], maxB, [i(:) j(:)]', A(ilin));