Hi, try this
r=var('r')
rho = 0.0058/((r/2.4)*(1+(r/2.4))^2)
integral(rho,r,0.000001,100000).n()
Robert Marik
On 20 Dub, 08:17, Florian Beutler <florian.beut...@gmx.de> wrote:
> hallo
> I just installed sage today and probably the problem I have at the
> moment is a typical beginner problem, but unfortunately the tutorial
> was not helpful concerning this points.
> I am very in favor for sage, especially because it is written in
> python but I think I need a somehow better (more details) tutorial.
> Can anybody link me to another one (I read the tutorial provided on
> the sage webpage)?
> I define a equation which I would like to integrate... I simplified
> the equation to reduce the possible errors
>
> if I use
> rho = 0.0058/((r/2.4)*(1+(r/2.4))^2)
> integral(rho,r,0,100000)
>
> this does not work because for r=0 rho is not defined. But anyway I
> want to integrate over the complete radius. What do I have to do?
> I can avoid the problem by using
>
> integral(rho,r,0.000001,100000)
> this gives:
> 0.01392*(10.6953303525 - (125003*log(500012) - 125003*log(100000) - 3)/
> 125003)
> how is it possible to force sage to give me one value and not this
> helpless term above?
> thanks
> regards
> florian
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