Am Donnerstag, 21. Juni 2012 17:24:39 UTC+2 schrieb Stefan Krastanov:
>
> At the moment doit() permits blacklisting, meaning that it will *not*
> operate on species mentioned in the hints. However I need doit() to
> operate on only one single species (i.e. I want a whitelist based
> doit). Is there a standard way to do this?
>
I don't think so. It is the same problem as with expand():
In [12]: ((x+cos(2*x))**2).expand(trig=1)
Out[12]:
2 2 4 2
x + 4*x*cos (x) - 2*x + 4*cos (x) - 4*cos (x) + 1
In [13]: ((x+cos(2*x))**2).expand(trig=1, multinomial=0)
Out[13]:
2
/ 2 \
\x + 2*cos (x) - 1/
Implementing it would be nice. (I honestly think that expand(trig=1) should
only do trigonometric expansion, nothing else.) For expand() it is quite
important that you don't expand everything possible, because it is very
expensive.
Vinzent
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