NaN comparisons - Call For Anecdotes

[Anders J. Munch]

Den 14-07-08 19:23, Skip Montanaro skrev:
>
> In addition to what others have written, I will add one thing. There
> are certainly situations where raising an exception is bad. Consider
> all the people in the scientific computing community doing fancy
> linear algebra sorts of things, often with missing data. They
> generally want NaN propagated and not have some long running
> calculation crash in the middle.

NaN!=NaN doesn't cause NaN's to propagate any more or any less. It simply causes 
a different branch of code to run, quite often the wrong one.

regards, Anders