## [Maxima-bugs] [ maxima-Bugs-3315476 ] definite integration

 [Maxima-bugs] [ maxima-Bugs-3315476 ] definite integration From: SourceForge.net - 2011-06-14 20:19:00 ```Bugs item #3315476, was opened at 2011-06-12 12:21 Message generated for change (Comment added) made by dgildea You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3315476&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: Closed >Resolution: Fixed Priority: 5 Private: No Submitted By: d-stanislav (ssllvv) Assigned to: Nobody/Anonymous (nobody) Summary: definite integration Initial Comment: maxima24.0 (%i1) integrate(2^(-x),x,0,1) (%o1) integrate(2^(-x),x,0,1) i.e. integral is not calculate ---------------------------------------------------------------------- >Comment By: Dan Gildea (dgildea) Date: 2011-06-14 16:18 Message: Fixed in solve.lisp - extend solve to handle 2^x = 0 => no solution ---------------------------------------------------------------------- Comment By: Aleksas (aleksasd) Date: 2011-06-14 08:17 Message: 1 method: (%i1) integrate(2^(-x),x,0,1); (%o1) integrate(1/2^x,x,0,1) (%i2) changevar(%, log(y)/log(2)=x, y, x); (%o2) integrate(1/y^2,y,1,2)/log(2) (%i3) ev(%, nouns); (%o3) 1/(2*log(2)) 2 method: (%i4) risch(1/2^x, x); (%o4) -%e^(-log(2)*x)/log(2) (%i5) ev(%,x=1)-ev(%,x=0); (%o5) 1/(2*log(2)) (%i6) float(%); (%o6) 0.72134752044448 3 method: (%i7) quad_qags(1/2^x, x, 0, 1); (%o7) [0.72134752044448,8.008566259537295*10^-15,21,0] ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3315476&group_id=4933 ```

 [Maxima-bugs] [ maxima-Bugs-3315476 ] definite integration From: SourceForge.net - 2011-06-12 16:21:01 ```Bugs item #3315476, was opened at 2011-06-12 19:21 Message generated for change (Tracker Item Submitted) made by ssllvv You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3315476&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: None Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: d-stanislav (ssllvv) Assigned to: Nobody/Anonymous (nobody) Summary: definite integration Initial Comment: maxima24.0 (%i1) integrate(2^(-x),x,0,1) (%o1) integrate(2^(-x),x,0,1) i.e. integral is not calculate ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3315476&group_id=4933 ```
 [Maxima-bugs] [ maxima-Bugs-3315476 ] definite integration From: SourceForge.net - 2011-06-14 12:17:04 ```Bugs item #3315476, was opened at 2011-06-12 19:21 Message generated for change (Comment added) made by aleksasd You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3315476&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: None Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: d-stanislav (ssllvv) Assigned to: Nobody/Anonymous (nobody) Summary: definite integration Initial Comment: maxima24.0 (%i1) integrate(2^(-x),x,0,1) (%o1) integrate(2^(-x),x,0,1) i.e. integral is not calculate ---------------------------------------------------------------------- Comment By: Aleksas (aleksasd) Date: 2011-06-14 15:17 Message: 1 method: (%i1) integrate(2^(-x),x,0,1); (%o1) integrate(1/2^x,x,0,1) (%i2) changevar(%, log(y)/log(2)=x, y, x); (%o2) integrate(1/y^2,y,1,2)/log(2) (%i3) ev(%, nouns); (%o3) 1/(2*log(2)) 2 method: (%i4) risch(1/2^x, x); (%o4) -%e^(-log(2)*x)/log(2) (%i5) ev(%,x=1)-ev(%,x=0); (%o5) 1/(2*log(2)) (%i6) float(%); (%o6) 0.72134752044448 3 method: (%i7) quad_qags(1/2^x, x, 0, 1); (%o7) [0.72134752044448,8.008566259537295*10^-15,21,0] ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3315476&group_id=4933 ```
 [Maxima-bugs] [ maxima-Bugs-3315476 ] definite integration From: SourceForge.net - 2011-06-14 20:19:00 ```Bugs item #3315476, was opened at 2011-06-12 12:21 Message generated for change (Comment added) made by dgildea You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3315476&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: Closed >Resolution: Fixed Priority: 5 Private: No Submitted By: d-stanislav (ssllvv) Assigned to: Nobody/Anonymous (nobody) Summary: definite integration Initial Comment: maxima24.0 (%i1) integrate(2^(-x),x,0,1) (%o1) integrate(2^(-x),x,0,1) i.e. integral is not calculate ---------------------------------------------------------------------- >Comment By: Dan Gildea (dgildea) Date: 2011-06-14 16:18 Message: Fixed in solve.lisp - extend solve to handle 2^x = 0 => no solution ---------------------------------------------------------------------- Comment By: Aleksas (aleksasd) Date: 2011-06-14 08:17 Message: 1 method: (%i1) integrate(2^(-x),x,0,1); (%o1) integrate(1/2^x,x,0,1) (%i2) changevar(%, log(y)/log(2)=x, y, x); (%o2) integrate(1/y^2,y,1,2)/log(2) (%i3) ev(%, nouns); (%o3) 1/(2*log(2)) 2 method: (%i4) risch(1/2^x, x); (%o4) -%e^(-log(2)*x)/log(2) (%i5) ev(%,x=1)-ev(%,x=0); (%o5) 1/(2*log(2)) (%i6) float(%); (%o6) 0.72134752044448 3 method: (%i7) quad_qags(1/2^x, x, 0, 1); (%o7) [0.72134752044448,8.008566259537295*10^-15,21,0] ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3315476&group_id=4933 ```