isnan:

Syntax: isnan ( A )

Description:

	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  

See Also: inf, isinf, finite, nan
