number of non zero entries in a matrix
n=nnz(X)
real or complex sparse (or full) matrix
integer, the number of non zero elements in X
nnz
counts the number of non zero entries in a sparse or full matrix
sp=sparse([1,2;4,5;3,10],[1,2,3]); nnz(sp) a=[1 0 0 0 2]; nnz(a) | ![]() | ![]() |