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## maxima-bugs

 [Maxima-bugs] [ maxima-Bugs-2828399 ] Failure of Taylor expansion From: SourceForge.net - 2009-07-28 14:01:21 ```Bugs item #2828399, was opened at 2009-07-28 14:01 Message generated for change (Tracker Item Submitted) made by nobody You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2828399&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 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Failure of Taylor expansion Initial Comment: When I apply the function 'taylor(function,z,..., ...)' to a function containing the d/dz operator, it works correctly. However if the differential is of another variable it fails. Thus: ================================= (%i1) G : diff(a(x,z),z,1); d (%o1) -- (a(x, z)) dz (%i2) H : taylor(G,z,0,1); ! ! 2 ! d ! d ! (%o2)/T/ -- (a(x, z))! + (--- (a(x, z))! ) z + . . . dz ! 2 ! !z = 0 dz ! !z = 0 ================================= works, but: ================================= (%i3) G : diff(a(x,z),x,1); d (%o3) -- (a(x, z)) dx (%i4) H : taylor(G,z,0,1); d (%o4)/T/ -- (a(x, z)) + . . . dx ================================= fails. Regards, David Webb. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2828399&group_id=4933 ```