nnz
===

number of non zero entries in a matrix



Calling Sequence
~~~~~~~~~~~~~~~~


::

    n=nnz(X)




Arguments
~~~~~~~~~

:X real or complex sparse (or full) matrix
: :n integer, the number of non zero elements in X
:



Description
~~~~~~~~~~~

`nnz` counts the number of non zero entries in a sparse or full matrix



Examples
~~~~~~~~


::

    sp=`sparse`_([1,2;4,5;3,10],[1,2,3]);
    nnz(sp)
    a=[1 0 0 0 2];
    nnz(a)




See Also
~~~~~~~~


+ `spget`_ retrieves entries of sparse matrix


.. _spget: spget.html