finding min matrix and where that is

Question

bachelor student 2016-8-10

评论： Star Strider 2016-8-10

Hi all I have a matrix, I want to find its minimum and where that minimum is, can anybody help me with that?

Answer 1

Star Strider 2016-8-10

This works to find the first minimum:

M = randi(9, 5);                            % Create Matrix
[Mmin,lidx] = min(M(:));
[r,c] = ind2sub(size(M),lidx);
Result = [Mmin r c]

If there are mor than one values of the minimum:

M = randi(9, 5);                            % Create Matrix
Mmin = min(M(:))
[r,c] = find(M == Mmin)

there is just one problem, i want to find the min, except for the zero values

Star Strider 2016-8-10

My pleasure.

To get the minimum value and locations for all values not equal to zero, this works:

M = randi([0 5], 5);                                % Create Matrix
Mmin = min(M(M(:) ~= 0))
[r,c] = find(M == Mmin)

(This also allows for negative values in the matrix if necessary, even though the test matrix values go from 0 to 5 here.)