From: SourceForge.net <no...@so...> - 2011-11-21 19:47:04
|
Bugs item #3440834, was opened at 2011-11-21 11:47 Message generated for change (Tracker Item Submitted) made by macrakis You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3440834&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: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: many issues with defint of atan2 Initial Comment: integrate(atan2(x,0),x,-1,1) => expt: undefined: 0 to a negative exponent. integrate(atan2(x,x),x,-1,1) => %pi/2, but integrate(atan2(x,x),x,-1,0) => -3*%pi/4 integrate(atan2(x,x),x,0,1) => %pi/4 ... so presumably should be -%pi/2 integrate(atan2(0,x),x,-1,1) => noun form ... but can do -1..0 and 0..1 Presumably the problem is that defint doesn't do anything clever with piecewise-defined functions. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3440834&group_id=4933 |