Find minimum and create a new matrix

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David du Preez 2017-4-12

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https://ww2.mathworks.cn/matlabcentral/answers/334959-find-minimum-and-create-a-new-matrix

回答： Andrei Bobrov 2017-4-12

matlab.mat

I have a 242x14 matrix. I want to look at the first 22 lines and find the minimum value in column 10. Then I want to create a new matrix including all the columns before the minimum value and a second new matrix containing the minimum value and all the values after it.

I also want to repeat this for the remaining part of the matrix. So in other words I will have two 121x14 matrices.

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KSSV 2017-4-12

You want to find minimum value for every 22 rows and them split the matrix, is it?

David du Preez 2017-4-12

Yes that is what I want to do

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Answer 1

Andrei Bobrov 2017-4-12

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https://ww2.mathworks.cn/matlabcentral/answers/334959-find-minimum-and-create-a-new-matrix#answer_262746

在 MATLAB Online 中打开

m = size(test_1,1);
i0 = (0:22:m-1)';
ii = ceil((1:m)'/22);
T = test_1(:,10);
T(T == 0) = inf;
idx_min = accumarray(ii,T,[],@(x)find(min(x) == x)) + i0;
ind = zeros(m,1);
ind([idx_min;i0+1]) = 1;
ind = cumsum(ind);
t = rem(ind,2) ~= 0;
Result{1} = test_1(t,:);
Result{2} = test_1(~t,:);