[Maxima-bugs] [ maxima-Bugs-1641487 ] deftaylor

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Bugs item #1641487, was opened at 2007-01-22 04:51
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Category: Lisp Core - Taylor
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Barton Willis (willisbl)
Assigned to: Nobody/Anonymous (nobody)
Summary: deftaylor

Initial Comment:
deftaylor works OK for expansion at zero, but don't
try to expand anywhere else:

(%i1) deftaylor(f(x), sum(x^k,k,0,inf));
(%o1) [f]
(%i2) taylor(f(x),x,0,2);
(%o2) 1+x+x^2+...
(%i3) taylor(f(x),x,1,2);
`taylor' unable to expand at a point specified in:
sum(x^*index,*index,0,inf)
 -- an error.  Quitting.  To debug this try debugmode(true);

Notice the garabage in the error message. For
an expansion at a nonzero number, it would
be better if Maxima used the differentiate and
evaluate scheme instead of trying to use the 
deftaylor info. 

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https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1641487&group_id=4933