count of non zero elements of a row vector in a loop
5 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Georgios Kirkinezos
el 28 de Oct. de 2020
Comentada: Peter O
el 28 de Oct. de 2020
Hi everyone,
i want to count the nonzero elements of a row-vector in a loop, i have the initial (360,1000) matrix u_new
for i=1:360;
for j=1:1000;
if u_new(i,j)==0 %%% here i transformed zeros to Nan, to use the following command isnan
u_new(i,j)=NaN;
insample_u_new=isnan(u_new(i,:))==0; %%% in this row-vector the possible values are 0 or 1, i am interested in getting the number of ones
P = numel(insample_u_new(i,j)~= 0); %%%here is the problem
end
end
end
I want the output P to be the number of the nonzero elements (ones) from the row-vector u_new=u(:,1:1000) for the loop.
Thanks for your answers in advance.
0 comentarios
Respuesta aceptada
Peter O
el 28 de Oct. de 2020
It sounds like you're trying to count the number of nonzero elements in each row? Use arrayfun to apply this function to each row of the matrix (extracting the row index).
NZ = arrayfun(@(ix) nnz(u_new(ix,:)),1:size(u_new,1))
NZ will be a 1 x n_rows vector containing the nonzero element counts for each row.
2 comentarios
Más respuestas (1)
Ver también
Categorías
Más información sobre Denoising and Compression en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!