Find minimum and create a new matrix
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David du Preez
on 12 Apr 2017
Answered: Andrei Bobrov
on 12 Apr 2017
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.
2 Comments
KSSV
on 12 Apr 2017
You want to find minimum value for every 22 rows and them split the matrix, is it?
Accepted Answer
Andrei Bobrov
on 12 Apr 2017
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,:);
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