MATLAB: Which row has the minimum non zero element

minimumrow with nonzeros

Hello i have a matrix and i want to find which is the row with minimum nonzeros elements.I dont want the number of non zeros,but i want to know which is the row.

Best Answer

I’m not certain what you mean by ‘minimum nonzeros elements’. This takes the row sum of the rows with nonzero elements and finds the row with the smallest row sum:

M = randi(51, 20, 5)-1;
[r0,~] = find(M == 0);
Mnz = M(setdiff([1:size(M,1)],r0),:);
[Mu, ix] = sort(sum(M,2));
Row_min_nz = is(x);                     % Row With Minimum Row Sum

Related Solutions

MATLAB: Finding the position of the minimum element in the matrix

You really should use find() rather than min() since find() will find them all and min() only finds the first occurrence, which is important since the min could occur at multiple locations:

M = [1 5 7; 2 4 5; 4, 1, 5]
minValue = min(M(:));
% Find all (row, column) pairs where M = the min value.
[rows, columns] = find(M == minValue)
% Print them out:
for k = 1 : length(rows)
	fprintf('M equals the min value of %f at row = %d, column = %d.\n', ...
		minValue, rows(k), columns(k));
end

You'll see

M =

1 5 7

2 4 5

4 1 5

rows =

columns =

M equals the min value of 1.000000 at row = 1, column = 1.

M equals the min value of 1.000000 at row = 3, column = 2.

MATLAB: Sum across columns for each row

Assuming yor question as

" (row 1 col 1) - max1)^2

(row 1 col 2 - max2)^2

(row 1 col 3) - max3)^2

(row 1 col 4) - max4)^2

(row 1 col 5) - max5)^2

(row 1 col 6 - max6)^2 "

Correct me if i am wrong

max_vals = max(impactScore);     % maximum values of each colum(1 to 6)
D = zeros(size(impactScore,1), 1);    % initialize 
for ii =1: size(impactScore, 1)
    D(ii, :) =  sqrt(sum([impactScore(ii,:)-max_val].^2));
end
D % column matrix after calculation

Best Answer

Related Solutions

MATLAB: Finding the position of the minimum element in the matrix

MATLAB: Sum across columns for each row

Related Question