[Maxima-bugs] [ maxima-Bugs-1692729 ] coeff, ratcoef on Taylor series around inf

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Bugs item #1692729, was opened at 2007-04-02 01:46
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: coeff, ratcoef on Taylor series around inf

Initial Comment:
It seems that coeff() and ratcoef() have trouble
extracting coefficients from Taylor expansions
around infinity:

(%i119) taylor(1/x, x, inf, 1);
                                   1
(%o119)/T/                         - + . . .
                                   x
(%i120) ratcoef(taylor(1/x, x, inf, 1), x, -1);
(%o120)/R/                             0
(%i121) coeff(taylor(1/x, x, inf, 1), x, -1);
(%o121)/R/                             0

A work-around is to get rid of the Taylor property, e.g., by wrapping the expression in subst(0, 0, ...).


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