Minimum value ineach column

Hi all

i want to extract the minimum positive value in each column, i have used this code

for j=1:length(columnA)
a(j)=min(A(A(:,j)>0));

end

but i am not able to solve the problem. A is a matrix

Thank for the help

Answer 1

[Matt J]

We don't know what columnA is in the code that you've shown. It would have to be a vector with the same number of columns as A for the code to work.

Regardless, the complete operation can easily be done without looping:

B=A: B(A<=0)=+inf;

a=min(B,[],1);

[EldaEbrithil]

length(columnA) is the number of column of the A matrix

[EldaEbrithil]

it gives me this error

Maximum variable size allowed by the program is exceeded.

[Matt J]

As I said, it doesn't matter. You don't need the loop. But if you were to use a loop, it would be

for j=1:size(A,2)
    
 a(j)=min( A( A(:,j)>0 ,  j) );

end

[EldaEbrithil]

Thank you very much, now it works!