[Maxima] RFC: extracting coefficients of a multivariate polynomial

[Stavros Macrakis]

On Fri, Apr 25, 2008 at 10:40 AM, Richard Fateman <fateman at cs.berkeley.edu>
wrote:

>  hmm, I didn't get the same timing results, maybe because I set
> ratvars:[x,y,z] first ....
>
> %o40)                                             [x, y, z]
> (%i41) ex:rat((x+y+z)^200)$
> Evaluation took 00.90 seconds (00.90 elapsed)
> (%i42) thru 10 do ratcoef(ex,x,100)$
> Evaluation took 7.34 seconds (7.34 elapsed)
> (%i43) thru 10 do ratcoef(ex,z,100)$
> Evaluation took 00.90 seconds (00.90 elapsed)
>

This seems to imply that ratcoef first converts to the current ratvars
before selecting the coeff.

That doesn't seem right.

              -s
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