Count the number of non-zero elements of a column/row of a 2D-Matrix?

Hello everyone,

I have a 2D Matrix and I want to make Matlab count the number of non-zero Elements within one row, is there a straightforward way to do this? Many thanks

[Eldar Cohen]

sum(A'~=0)

Answer 1

[James Tursa]

sum(X(row_number,:)~=0)

[Daniel Roßfeld]

Alternatively, use

nnz(A(row, :))

Answer 2

[Thomas]

Try:

 a=[3 0 0;0 2 0; 1 0 4]   %input matrix
 sum(a~=0,2)              % no. of nozero elements in each row

Answer 3

[Muhammad Ilias Amin]

a = [3 0 0; 0 2 0; 1 0 0];

To get the no of non zero columns: sum( all( a == 0, 1 ) );

To get the no of non zero rows: sum( all( a == 0, 2 ) );

[Souarv De]

A small correction in the text part to the above two lines code is that it will give no of zero columns and rows, not non-zero columns and non-zero rows.