From: SourceForge.net <no...@so...> - 2009-10-09 16:13:00
|
Bugs item #2875784, was opened at 2009-10-09 16:38 Message generated for change (Comment added) made by l_butler You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2875784&group_id=4933 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Lisp Core - Integration Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Leo Butler (l_butler) Assigned to: Nobody/Anonymous (nobody) Summary: fourier integral incorrect Initial Comment: The following is incorrect: (%i2) I : 'integrate(%e^(%i*x)*sin(x)/x,x,minf,inf); (%o2) 'integrate(%e^(%i*x)*sin(x)/x,x,minf,inf) (%i3) J : changevar(I,y+x,y,x); (%o3) 'integrate(%e^-(%i*y)*sin(y)/y,y,minf,inf) (%i4) ev(I,nouns); (%o4) %pi (%i5) ev(J,nouns); (%o5) 0 ---------------------------------------------------------------------- >Comment By: Leo Butler (l_butler) Date: 2009-10-09 17:13 Message: I should add that there are two problems above: first, I and J should be equal; second, the correct answer should be (%i19) integrate(cos(x)*sin(x)/x,x,minf,inf); (%o19) %pi/2 ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2875784&group_id=4933 |