[Maxima-bugs] [ maxima-Bugs-658850 ] Taylor "invalid call to var-expand"

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Bugs item #658850, was opened at 2002-12-26 19:47
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Category: None
Group: None
>Status: Open
>Resolution: Accepted
Priority: 5
Submitted By: Stavros Macrakis (macrakis)
Assigned to: Nobody/Anonymous (nobody)
>Summary: Taylor "invalid call to var-expand"

Initial Comment:
Maxima 5.5 on Windows GCL

C15) taylor(exp(-x)/x,x,0,5);
Invalid call to var-expand
 -- an error.

This is an internal error.  Though this expression does 
not have a Taylor/Laurent expansion, it should still give a 
user-oriented error, not an internal error.


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Comment By: Martin Rubey (kratt5)
Date: 2003-01-23 05:39

Message:
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user_id=651552

It should read   
   
taylor(exp(-1/x)/x,x,0,5); 
 
Invalid call to var-expand 
 -- an error.  Quitting.  To debug this try DEBUGMODE(TRUE); 

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Comment By: Stavros Macrakis (macrakis)
Date: 2003-01-22 08:48

Message:
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user_id=588346

Sorry, I must have miscopied the error case (or perhaps 
some flags were set?), and I can't reconstruct it.  The 
example I gave does work in 5.5, and does have a Laurent 
expansion.  I am deleting this bug report and marking it 
as "invalid".

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Comment By: Martin Rubey (kratt5)
Date: 2003-01-22 08:39

Message:
Logged In: YES 
user_id=651552

I do not quite understand. On my (slightly patched) maxima I get: 
 
 ------------------------------------------------------------- 
 
Maxima version: 5.9.0rc3 
Maxima build date: 21:0 11/26/2002 
host type: i686-pc-linux-gnu 
lisp-implementation-type: Kyoto Common Lisp 
lisp-implementation-version: GCL-2-5.0 
 
------------------------------------------------------------- 
The above information is also available from the Maxima function build_info(). 
 
(D1) 
(C2) taylor(exp(-x)/x,x,0,5); 
 
                                 2    3    4     5 
                    1       x   x    x    x     x 
(D2)/T/             - - 1 + - - -- + -- - --- + --- + . . . 
                    x       2   6    24   120   720 
(C3) 
 
which seems to be correct... 
 
Martin 

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