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[Maxima-bugs] [ maxima-Bugs-904543 ] ratcoeff incompatible with taylor [x,y]

 [Maxima-bugs] [ maxima-Bugs-904543 ] ratcoeff incompatible with taylor [x,y] From: SourceForge.net - 2004-02-25 21:08:53 ```Bugs item #904543, was opened at 2004-02-25 15:57 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=904543&group_id=4933 Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: ratcoeff incompatible with taylor [x,y] Initial Comment: t: taylor(sin(x+y),[x,y],0,5) => y+x-.... ratcoeff(t,x,1) => 0+... but ratcoeff(ratdisrep(t),x,1) => (y^4-12*y^2+24)/24 The ratdisrep case should be taken as the definition. If we don't want to do that, it should at least give an error, saying that it doesn't handle multivariate series. It would be nicer, though, if ratcoeff took multiple arguments, e.g. ratcoeff(t,x,1,y,0) == ratcoeff(ratcoeff(t,x,1),y,0) => x+y ratcoeff(t,[x,y],1) => x+y ratcoeff(t,[x,y],2) => 0 ratcoeff(t,[x,y],3) => -(y^3+3*x*y^2+3*x^2*y+x^3)/6 but that's another matter.... ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=904543&group_id=4933 ```

 [Maxima-bugs] [ maxima-Bugs-904543 ] ratcoeff incompatible with taylor [x,y] From: SourceForge.net - 2004-02-25 21:08:53 ```Bugs item #904543, was opened at 2004-02-25 15:57 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=904543&group_id=4933 Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: ratcoeff incompatible with taylor [x,y] Initial Comment: t: taylor(sin(x+y),[x,y],0,5) => y+x-.... ratcoeff(t,x,1) => 0+... but ratcoeff(ratdisrep(t),x,1) => (y^4-12*y^2+24)/24 The ratdisrep case should be taken as the definition. If we don't want to do that, it should at least give an error, saying that it doesn't handle multivariate series. It would be nicer, though, if ratcoeff took multiple arguments, e.g. ratcoeff(t,x,1,y,0) == ratcoeff(ratcoeff(t,x,1),y,0) => x+y ratcoeff(t,[x,y],1) => x+y ratcoeff(t,[x,y],2) => 0 ratcoeff(t,[x,y],3) => -(y^3+3*x*y^2+3*x^2*y+x^3)/6 but that's another matter.... ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=904543&group_id=4933 ```
 [Maxima-bugs] [ maxima-Bugs-904543 ] ratcoeff incompatible with taylor [x,y] From: SourceForge.net - 2006-04-09 20:43:46 ```Bugs item #904543, was opened at 2004-02-25 13:57 Message generated for change (Settings changed) made by robert_dodier You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=904543&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 - Taylor Group: None Status: Open Resolution: None Priority: 5 Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: ratcoeff incompatible with taylor [x,y] Initial Comment: t: taylor(sin(x+y),[x,y],0,5) => y+x-.... ratcoeff(t,x,1) => 0+... but ratcoeff(ratdisrep(t),x,1) => (y^4-12*y^2+24)/24 The ratdisrep case should be taken as the definition. If we don't want to do that, it should at least give an error, saying that it doesn't handle multivariate series. It would be nicer, though, if ratcoeff took multiple arguments, e.g. ratcoeff(t,x,1,y,0) == ratcoeff(ratcoeff(t,x,1),y,0) => x+y ratcoeff(t,[x,y],1) => x+y ratcoeff(t,[x,y],2) => 0 ratcoeff(t,[x,y],3) => -(y^3+3*x*y^2+3*x^2*y+x^3)/6 but that's another matter.... ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=904543&group_id=4933 ```