find the minmum value in each column of a matrix

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kurdistan mohsin
kurdistan mohsin on 11 Apr 2022
Commented: Mathieu NOE on 12 Apr 2022
i have the below matrix(d) and i want to find the minumum value of each column but that value must not equal to zero
d=
0 10.1164 0 0 0
11.4474 0 0 0 0
0 14.8026 0 0 0
0 0 0 0 17.4658
0 0 5.3885 0 0
13.7349 0 0 0 0
0 0 0 14.9564 0
0 0 10.7354 0 0
0 0 0 0 18.0236
0 0 0 17.2189 0

Accepted Answer

Rik
Rik on 11 Apr 2022
If you set all values of 0 to NaN, you can do this simply with the min function.
A=[ 0 10.1164 0 0 0
11.4474 0 0 0 0
0 14.8026 0 0 0
0 0 0 0 17.4658
0 0 5.3885 0 0
13.7349 0 0 0 0
0 0 0 14.9564 0
0 0 10.7354 0 0
0 0 0 0 18.0236
0 0 0 17.2189 0];
A(A==0)=NaN;
min(A)
ans = 1×5
11.4474 10.1164 5.3885 14.9564 17.4658

More Answers (1)

Mathieu NOE
Mathieu NOE on 11 Apr 2022
hello
try this :
d=[ 0 10.1164 0 0 0;
11.4474 0 0 0 0;
0 14.8026 0 0 0;
0 0 0 0 17.4658
0 0 5.3885 0 0;
13.7349 0 0 0 0;
0 0 0 14.9564 0;
0 0 10.7354 0 0;
0 0 0 0 18.0236;
0 0 0 17.2189 0];
for ci = 1:size(d,2)
tmp = d(:,ci);
ind_non_zero = find(tmp>0);
[val(ci),ind] = min(tmp(ind_non_zero));
ind_final(ci) = ind_non_zero(ind);
end
val % min value (column direction)
ind_final % corresponding row position

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