- To: mathgroup at smc.vnet.net
- Subject: [mg78307] Integration variables
- From: mattew <m_manni_m at hotmail.com>
- Date: Thu, 28 Jun 2007 04:20:02 -0400 (EDT)
Hi everybody, Mathematica gives us the possibility to use spherical coordinates (r,Ttheta,Pphi): I'm trying to write an integral in the polar angle Ttheta of the form:
Integral in [-1,1] Ttheta dCos(Ttheta)
where Ttheta is the polar angle and the integration variable is the cosine of Ttheta in the interval [-1,1].
I got the following error:
ntegrate::ivar: "Cos[Ttheta] is not a valid variable."
Does anyone knows the reason for that?
p.s: It happens with any system of coordinates, actually.
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