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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
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<A NAME="PetscIsInfOrNanReal"><H1>PetscIsInfOrNanReal</H1></A>
Returns an error code if the input double has an infinity for Not-a-number (Nan) value, otherwise 0.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#if defined(PETSC_USE_REAL___FLOAT128)
PetscErrorCode PetscIsInfOrNanReal(PetscReal a)
</PRE>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>a </B> -the floating point number
<br>
<P>
Notes: uses the C99 standard isinf() and isnan() on systems where they exist.
Otherwises uses ((a - a) != 0.0), note that some optimizing compiles compile
out this form, thus removing the check.
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/utils/mathinf.c.html#PetscIsInfOrNanReal">src/sys/utils/mathinf.c</A>
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