ISINF  ISINF Test for infinities


Usage
 
 Returns true for entries of an array that are infs (i.e.,
 infinities).  The usage is
 
    y = isinf(x)
 
 The result is a logical array of the same size as x,
 which is true if x is not-a-number, and false otherwise.
 Note that for complex or dcomplex data types that
 the result is true if either the real or imaginary parts
 are infinite.
 