nnz¶

number of non zero entries in a matrix

Calling Sequence¶

n=nnz(X)

:X real or complex sparse (or full) matrix : :n 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)