[yt-users] derived quantities

[Stephen Skory]

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
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