[Numpy-discussion] What is the logical value of nan?

Timothy Hochberg tim.hochberg@ieee....
Tue Mar 10 17:19:03 CDT 2009


On Tue, Mar 10, 2009 at 2:49 PM, Charles R Harris <charlesr.harris@gmail.com
> wrote:

>
>
> 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.
>

I appear to be late to the party, but IMO it should raise an exception in
those cases where it's feasible to do so.


-- 
.  __
.   |-\
.
.  tim.hochberg@ieee.org
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