Re: OT: Re: Xcas

Also i would like to clarify some doubts about the CAS, mainly in the
part of simbolic calculus, as a result of some made comparisons of
speed with one TI... more specifically with time of evaluation of the
integral of this one function:

x 2007 ^ x LN *


A friend commented to me that TI uses a system of tables of integrals
that make the evaluation much more fast, and in fact it is it, because
in my 50g gave a time of 268s and TI made it in 4 or 5 seconds...


the reason for slowness on the 50g is that
dense polynomials are used (i.e. a list of size
2008 to represent x^2007). You can use IBP
X^Y*LN(X)
X^(Y+1)
IBP
INTVX
+
'Y=2007'
SUBST
Fortunately, I have improved this on Xcas (int(x^2007*ln(x),x))
.

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