On Tuesday, April 8, 2014 1:55:49 PM UTC-7, Nils Bruin wrote:
>
> F=Qxz(f) #this conveniently lifts z to a
> transcendental in Q[x,z]
>
Oops, that only works because of the last-resort attempt of converting f to
a string and then feeding the string to Qxz. One probably shouldn't rely on
such code in production situations. You'd be better off using
F=Qxz({ (degx,degz) :cfz for degx,cfx in enumerate(f.list()) for degz,cfz
in enumerate(cfx.list())})
which won't win any prizes for legibility and only qualifies as a one-liner
in the technical sense, but it is much faster than the string-based
conversion.
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