[Numpy-discussion] What is the logical value of nan?
Charles R Harris
charlesr.harris@gmail....
Tue Mar 10 16:49:15 CDT 2009
On Tue, Mar 10, 2009 at 3:16 PM, Stéfan van der Walt <stefan@sun.ac.za>wrote:
> 2009/3/10 Pauli Virtanen <pav@iki.fi>:
> > Nonzero Python object, hence True. Moreover, it's also True in Python:
>
> Also in C:
>
> #include <math.h>
> #include <stdio.h>
>
> int main() {
> double nan = sqrt(-1);
> printf("%f\n", nan);
> printf("%i\n", bool(nan));
> return 0;
> }
>
> $ ./nan
> nan
> 1
>
So resolved, it is True.
Chuck
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