Date: Jun 13, 2013 6:04 PM
Author: Waldek Hebisch
Subject: Re: The Charlwood Fifty
clicliclic@freenet.de wrote:

>

> "Nasser M. Abbasi" schrieb:

> >

> > On 6/10/2013 5:23 AM, clicliclic@freenet.de wrote:

> >

> > >

> > > I strongly suspect that "Sage" always means "Maxima" (not e.g. "Sympy"):

> > > see the Runtime Error Message for problem #8.

> > >

> >

> > You are right. But I just updated the page with maxima 5.28.0-2

> > and in all of them, the results were the same as Sage's, except for

> > #3. Sage did not evaluate it. Not sure why. Will be nice to know

> > which version of Maxima it is using. I use the notebook web

> > interface at http://www.sagenb.org

> >

>

> It should be possible to switch the Sage integrator from "Maxima" to

> "Sympy"; perhaps somebody could explain how? This would be preferable to

> listing the Maxima results twice.

>

> Martin.

I tried sympy-0.7.2 on the ten. I got anwers for #2 and #10:

>>> integrate((x*asin(x))/sqrt(1 - x**2), x)

__________

/ 2

x - \/ - x + 1 *asin(x)

>>> integrate((x**3*exp(asin(x)))/sqrt(1 - x**2), x)

__________ __________

3 asin(x) 2 / 2 asin(x) asin(x) / 2 as

x *e 3*x *\/ - x + 1 *e 3*x*e 3*\/ - x + 1 *e

----------- - --------------------------- + ------------ - -------------------

10 10 10 10

in(x)

-----

#4 did not finish after 35 min. The other return unevaluated.

#9 took about 15 min to return unevaluated result, on most

other there was visible delay before answer.

Trying other examples which in principle sympy should do with

no trouble I had to wait few minutes in one case and in

another case sympy run out of memory after few hours.

--

Waldek Hebisch

hebisch@math.uni.wroc.pl