From: SourceForge.net <noreply@so...>  20040225 21:08:53

Bugs item #904543, was opened at 20040225 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^412*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 