# How to get a matrix of all maximum values of elements of multiple matrices of the same size?

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Mike Mierlo van 2019 年 9 月 29 日
コメント済み: Akbar Najafi 2021 年 10 月 14 日
I want to get a matrix filled with elements that are the highest number of the element in other matrices on the same location in that matrix. The solution should work for large matrices, so manual labour is no option.
Simple example: I have matrix A, B and C of the same size. I want to form matrix D with in position 1,1 the max of A(1,1), B(1,1) and C(1,1). The same for position 1,2 etcetera. Matrix D is formed this way manually in the example below. I would like to have a code for this action, suitable for (very) large matrices.
if true
A= [1 2 3; 4 5 6];
B= [6 5 4; 3 2 1];
C= [4 4 4.5; 4.5 4 4];
end
if true
D = [6 5 4.5; 4.5 5 6]
end

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### 採用された回答

Jackson Burns 2019 年 9 月 29 日
Hi Mike!
Here's a function I wrote to do the task. It assumes that the three input arrays are the same dimensions.
function outarray = findmaxes(inarray1,inarray2,inarray3)
outarray = zeros(size(inarray1));
for i = 1:numel(inarray1)
outarray(i) = max([inarray1(i) inarray2(i) inarray3(i)]);
end
end
Call it like this:
maxarray = findmaxes(A,B,C)
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Akbar Najafi 2021 年 10 月 14 日
Hi Jackson
Can we find the origin position of values in the outarray? I mean, for example, outrray (i) was belonged to A and so on. In other words, I am looking for a matrix with an index; is it possible?
Thanks
Akbar

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