Fernando Contreras
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 Dec 2 awarded Scholar Dec 2 accepted Integrate message: can't prove Integration limits are real Dec 2 awarded Supporter Dec 2 comment Integrate message: can't prove Integration limits are real Ok, I analyzed the results I got in paper vs the code vs step by step in mathematica. Your answer is correct, as it makes the code work, however it still gives me a different result from the one that I'm getting on paper (and my book agrees with). Seems like the problem has to do with the Integration itself, not the piecewise. I suppose it has to do with assumptions I'm making that mathematica isn't, but I don't know why. It'd boil down to an integrate of: C Integrate[Sin[D t],{t,L/3,2L3] With C, and D being constants related to the weight distributed over a stick of length L. Dec 2 awarded Commentator Dec 2 comment Integrate message: can't prove Integration limits are real Ok, I'll take a look at the Piecewise doc, however the result seems odd. Since I couldn't let really stop working I solved it by hand and I get a completely different result. I'll get back at you when I figure out the problem. Dec 2 comment Integrate message: can't prove Integration limits are real I don't know if I'm interpreting that correctly: The output says that for any L>0, the result would be the one on the top left, times 2/L, right? Dec 2 comment Integrate message: can't prove Integration limits are real The problem is that it works for functions that have numeric limits such as: bn[-\[Pi], 2 \[Pi], \[Piecewise] { {-\[Pi], -\[Pi] < t < 0}, {\[Pi], 0 < t < \[Pi]} }] It does give me the expected result, I get stuck when I try to use variable periods T. Dec 2 comment Integrate message: can't prove Integration limits are real I changed the format as you suggested. I think... Is it good now? Dec 2 revised Integrate message: can't prove Integration limits are real Fixed code format Dec 2 asked Integrate message: can't prove Integration limits are real Mar 22 awarded Student Mar 22 revised How to revolve a surface about a line other than the $x,y,z$ axes? added 148 characters in body, added more information Mar 22 awarded Editor Mar 22 comment How to revolve a surface about a line other than the $x,y,z$ axes? I'm working on it :P. Now I just need to figure out how to revolve implicit functions. Mar 22 comment How to revolve a surface about a line other than the $x,y,z$ axes? So the only way to do it is modifying the function? Either way, it worked. Thanks a bunch! Mar 22 revised How to revolve a surface about a line other than the $x,y,z$ axes? added 148 characters in body Mar 21 asked How to revolve a surface about a line other than the $x,y,z$ axes?