how to find non zero minimum

hi, i have a [8200,1] matrix with zero and positive values. i need to find non zero minimum. please guide me if you can

Answer 1

[maryam]

this is simple :) name the matrix A (for example) then : m=min(A(A>0)); m returns the non zero minumum

[Charanraj]

Ho to do this columnwise. For example, I have 200 columns and I need to find in each column the minimum non zero. Thanks

[Selina KOLOKYTHA]

Hi! Here you go:

% if A is your matrix 
C=200 % number of columns
for i=1:C % for each column i
    B=A(:,i); % assign each column of A to B
    m(i)=min(B(B>0)); % m returns the non zero minumum of each column i
end

Note that this only works if matrix A has zero to positive values - not if it has negative values.

Answer 2

[Zoltán Csáti]

Lets suppose your matrix is called A. Then you first select those elements that are non-zero (i.e. positive) and after that use the min function:

min(A(A > 0))

[maryam]

thank you so much

Answer 3

[Erick Medina]

Declare a temp_variable which is a copy of your target vector and delete all indexes equal to zero.

temp_vec = vec; temp_vec(temp_vec==0) = []; min(temp_vec)