How do I check if a number is NaN? From: (Stephen Linam)

NaN is "Not a Number". It arises because the RISC System/6000 uses
IEEE floating point arithmetic.

To determine if a variable is a NaN you can make use of the property
that a NaN does not compare equal to anything, including itself.
Thus, for real variable X, use

IF (X .NE. X) THEN ! this will be true if X is NaN

Floating point operations which cause exceptions (such as an overflow)
cause status bits to be set in the Floating Point Status and Control
Register (FPSCR). There is a Fortran interface to query the FPSCR, and
it is described in the XLF Fortran manuals -- I don't have the manuals
right here, but look for FPGETS and FPSETS.

The IBM manual "Risc System/6000 Hardware Technical Reference - General
Information" (SA23-2643) describes what floating point exceptions can
occur and which bits are set in the FPSCR as a result of those exceptions.
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