The canonical answer to IsNan is found here:
http://www.cpan.org/doc/FMTEYEWTK/is_numeric.html
To Quote:
The special IEEE notions of Infinity and NaN (not a number) will be pr
+operly honored:
$n = 'NaN';
print 2 * $n;
NaN
print 10 * $n
NaN
print 1 + NaN
NaN
$i = 'Infinity'
print 1 + $i
Infinity
print $i * $i
Infinity
print $i - $i
NaN
print 'Infinity' < 0
0
print 'Infinity' > 0
1
hsm
Edit by tye to change very wide BLOCKQUOTE+PRE to CODE
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