  isnan
  Builtin Function



      SSyynnooppssiiss
        Test for NaN values.

      SSyynnttaaxx
        isnan ( _A )

      DDeessccrriippttiioonn
        isnan returns TRUE (1) if _A is a NaN (Not A Number). If _A is a
        vector or a matrix the test is performed element-by-element, and
        a matrix the same size as _A is returned.

        NaNs can be create by the 0/0 operation on most computers.

        Example:


          > a = [1, 2, 3; 4, 5, nan(); 7, 8, 9]
           a =
                  1          2          3
                  4          5  nan0x80000000
                  7          8          9
          > isnan (a)
                  0          0          0
                  0          0          1
                  0          0          0





     SSeeee AAllssoo
        inf, isinf, finite, nan





























