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

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Ines
Ines le 3 Mai 2012
Modifié(e) : Souarv De le 23 Mai 2023
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

Réponse acceptée

James Tursa
James Tursa le 3 Mai 2012
sum(X(row_number,:)~=0)

Plus de réponses (2)

Thomas
Thomas le 3 Mai 2012
Try:
a=[3 0 0;0 2 0; 1 0 4] %input matrix
sum(a~=0,2) % no. of nozero elements in each row

Muhammad Ilias Amin
Muhammad Ilias Amin le 12 Mai 2014
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 ) );
  1 commentaire
Souarv De
Souarv De le 23 Mai 2023
Modifié(e) : Souarv De le 23 Mai 2023
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.

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