MATLAB: What does this do

matrixprogramming

I can't figure out what this bit of code is doing:

    [m,n]=find(min(a))

I know that it is not returning the indices of the minimum entries in the array 'a', but what is it doing?

Best Answer

[m,n]=min(a)

m is the minimum, n is the index of n m in a

You can try an example

a=[4 7 3 6 2 7 8]
[m,n]=min(a)

Now if you write

r=find(min(a))

you will find the result

r=1

because in our example min(a)=2, it contains just one elment, so there is one index=1

Related Solutions

MATLAB: Finding the indices of all minimum elements in a matrix

You can do it in one line of code. You just first need to decide if you want to locate occurrences of the global min, or if you want to find local mins (using imregionalmin), AND if you want a vector of logical indexes or a vector of actual indexes. Since you didn't say, I'm giving all 4 possibilities:

% Create sample data:
vec = [1,1,2,2,1,2,1,3,0,-1,4,0,3,-1,5];
% Find local mins as a logical index.
localMinIndexes = imregionalmin(vec)
% Find global mins as a logical index.
globalMin = min(vec);
globaMinIndexes = vec == globalMin
% If you want/need actual indexes, use find:
% Find local mins as actual indexes.
localMinIndexes = find(imregionalmin(vec))
% Find global mins as actual indexes.
globaMinIndexes = find(vec == min(vec))

MATLAB: Minimum of a 3X3 matrix

Two possible approaches:

A = rand(3);                                    % Create Data
[Amin,idx] = min(A(:));                         % One Option
[r,c] = ind2sub(size(A), idx)
[r,c] = find(A == min(A(:)))                    % Another Option
Amin = A(r,c)

Best Answer

Related Solutions

MATLAB: Finding the indices of all minimum elements in a matrix

MATLAB: Minimum of a 3X3 matrix

Related Question