[petsc-dev] NaN constant?

[Jed Brown]

Barry Smith <bsmith at mcs.anl.gov> writes:

>   There is no portable way that I am aware of in C89 to generate a NaN.

Fortunately, we've had C99 for 16 years.

#include <math.h>

  NAN


Is there any architecture where this isn't supported?
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