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## maxima-bugs

 [Maxima-bugs] [ maxima-Bugs-3322221 ] Lost solutions in to_poly_solve From: SourceForge.net - 2011-06-19 05:43:10 ```Bugs item #3322221, was opened at 2011-06-19 08:43 Message generated for change (Tracker Item Submitted) made by aleksasd You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3322221&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 - Solving equations Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Aleksas (aleksasd) Assigned to: Nobody/Anonymous (nobody) Summary: Lost solutions in to_poly_solve Initial Comment: Lost solutions in to_poly_solve (%i1) eq:sin(2*x)=cos(x); (%o1) sin(2*x)=cos(x) (%i2) eq1:trigexpand(eq); (%o2) 2*cos(x)*sin(x)=cos(x) Lost solutions: (%i3) to_poly_solve([eq], [x]); Loading maxima-grobner \$Revision: 1.6 \$ \$Date: 2009/06/02 07:49:49 \$ (%o3) %union([x=-(4*%pi*%z0+%pi)/2],[x=(4*%pi*%z1+%pi)/6]) Correct: (%i4) to_poly_solve([eq1], [x]); (%o4) %union([x=2*%pi*%z15-%pi/2],[x=2*%pi*%z17+%pi/2], [x=2*%pi*%z19+%pi/6],[x=2*%pi*%z21+(5*%pi)/6]) ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3322221&group_id=4933 ```
 [Maxima-bugs] [ maxima-Bugs-3322221 ] Lost solutions in to_poly_solve From: SourceForge.net - 2011-06-19 06:28:12 ```Bugs item #3322221, was opened at 2011-06-19 08:43 Message generated for change (Comment added) made by aleksasd You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3322221&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 - Solving equations Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Aleksas (aleksasd) Assigned to: Nobody/Anonymous (nobody) Summary: Lost solutions in to_poly_solve Initial Comment: Lost solutions in to_poly_solve (%i1) eq:sin(2*x)=cos(x); (%o1) sin(2*x)=cos(x) (%i2) eq1:trigexpand(eq); (%o2) 2*cos(x)*sin(x)=cos(x) Lost solutions: (%i3) to_poly_solve([eq], [x]); Loading maxima-grobner \$Revision: 1.6 \$ \$Date: 2009/06/02 07:49:49 \$ (%o3) %union([x=-(4*%pi*%z0+%pi)/2],[x=(4*%pi*%z1+%pi)/6]) Correct: (%i4) to_poly_solve([eq1], [x]); (%o4) %union([x=2*%pi*%z15-%pi/2],[x=2*%pi*%z17+%pi/2], [x=2*%pi*%z19+%pi/6],[x=2*%pi*%z21+(5*%pi)/6]) ---------------------------------------------------------------------- >Comment By: Aleksas (aleksasd) Date: 2011-06-19 09:28 Message: In to_poly_solve equation is not equivalent to lhs(equation)-rhs(equation)=0. For example: (%i1) eq:sin(2*x)=cos(x); (%o1) sin(2*x)=cos(x) (%i2) to_poly_solve([eq], [x]); Loading maxima-grobner \$Revision: 1.6 \$ \$Date: 2009/06/02 07:49:49 \$ (%o2) %union([x=-(4*%pi*%z0+%pi)/2],[x=(4*%pi*%z1+%pi)/6]) (%i3) to_poly_solve([lhs(eq)-rhs(eq)=0], [x]); (%o3) %union([x=2*%pi*%z15-%pi/2],[x=2*%pi*%z17+%pi/2],[x=2*%pi*%z19+%pi/6],[x=2*%pi*%z21+(5*%pi)/6]) ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3322221&group_id=4933 ```