RE: How to Integrate[Abs[x]]?
- To: mathgroup at smc.vnet.net
- Subject: [mg91626] RE: [mg91624] How to Integrate[Abs[x]]?
- From: "Jaccard Florian" <Florian.Jaccard at he-arc.ch>
- Date: Sat, 30 Aug 2008 01:49:53 -0400 (EDT)
- References: <200808290825.EAA24127@smc.vnet.net>
Hello,
It's because Mathematica considers x as a Complex number.
So you can do it like this :
In[35]:= Assuming[Element[x, Reals], Integrate[Abs[x], x]]
Out[35]= Piecewise[{{-(x^2/2), x <= 0}}, x^2/2]
Or like this :
In[36]:= Integrate[Sqrt[x^2], x]
Out[36]= (x*Sqrt[x^2])/2
Regards,
F.Jaccard
-----Message d'origine-----
De : Thomas Dybdahl Ahle [mailto:lobais at gmail.com]
Envoy=E9 : vendredi, 29. ao=FBt 2008 10:26
=C0 : mathgroup at smc.vnet.net
Objet : [mg91624] How to Integrate[Abs[x]]?
On my Ti calculater |x| is easily integrated to |x|*x/2, but when I type =
Integrate[Abs[x],x] in mathematica, it seams like it can't find the =
solution.
Is there anything I'll have to do, to make mathematica find the =
solution?
- References:
- How to Integrate[Abs[x]]?
- From: Thomas Dybdahl Ahle <lobais@gmail.com>
- How to Integrate[Abs[x]]?