NNZ Number of Nonzeros

Section: Inspection Functions

Usage

Returns the number of nonzero elements in a matrix. The general format for its use is 
   y = nnz(x)

This function returns the number of nonzero elements in a matrix or array. This function works for both sparse and non-sparse arrays. For

Example

--> a = [1,0,0,5;0,3,2,0]

a = 
 1 0 0 5 
 0 3 2 0 

--> nnz(a)

ans = 
 4 

--> A = sparse(a)

A = 
 1 1 1
 2 2 3
 2 3 2
 1 4 5
--> nnz(A)

ans = 
 4