Intel® Fortran Compiler
Build applications that can scale for the future with optimized code designed for Intel® Xeon® and compatible processors.
Announcements
FPGA community forums and blogs on community.intel.com are migrating to the new Altera Community and are read-only. For urgent support needs during this transition, please visit the FPGA Design Resources page or contact an Altera Authorized Distributor.
29281 Discussions

How to check NaN

ekeom
Novice
‎03-02-2009 06:02 AM
1,238 Views
Dear all,

How can I check if a variable contain NaN (Not a number). I would like to write something like :

if(a.eq.NaN) then

Do something special

endif

Best regards,

Didace
0 Kudos

Link Copied

1 Reply
TimP
Honored Contributor III
‎03-02-2009 06:06 AM
1,238 Views
This has been discussed at more length previously on these forums. Current ifort supports both the legacy (non-standard) ISNAN() function and the standard ieee_is_nan().
0 Kudos
Copy link
Reply

Community support is provided Monday to Friday. Other contact methods are available here.

Intel does not verify all solutions, including but not limited to any file transfers that may appear in this community. Accordingly, Intel disclaims all express and implied warranties, including without limitation, the implied warranties of merchantability, fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of dealing, or usage in trade.

For more complete information about compiler optimizations, see our Optimization Notice.