[yt-users] derived quantities

[Matthew Turk]

Hi Stephen,

You might try printing out what is fed into the combine function; I
think what you really want to do is return (data["creation_time"] >
0).sum() in _NumberOfStars.  Inside _combNumberOfStars try printing
both data and ct, as well, to see if it's an axis problem with the
combine function.

-Matt

On Fri, Dec 10, 2010 at 3:24 PM, Stephen Skory <stephenskory at yahoo.com> wrote:
> Matt,
>
>> Try: dd.quantities["NumberOfStars"]()
>
>
> Duh! That works, sort of: Now I'm getting '0' when I am expecting '1'. Any ideas why? If I put a print in _NumberOfStars() I see that one of the grids has one star, the others zero, but otherwise things are not as I expect.
>
>
>  Stephen Skory
> stephenskory at yahoo.com
> http://stephenskory.com/
> 510.621.3687 (google voice)
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