Axiom Computer Algebra System - Bugs: bug #9218, problems with output of D

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bug #9218: problems with output of D

Submitter:	Martin Rubey <kratt6>
Submitted:	Fri 04 Jun 2004 08:26:31 AM UTC
Category:	None	Severity:	3 - Normal
Item Group:	code bug	Status:	None
Privacy:	Public	Assigned to:	None
Originator Name:	kratt6	Open/Closed:	Open
Release:	tla from may 2004	Reproducibility:	None
Fixed Release:
Error message:
Example of code trigerring the bug:	eval(D(f(x),x),f,y+->sum(g(i,y),i=a..y))
Internal cause:	I think, the real internal cause is that axiom assumes that everything can be nicely differentiated, thus not providing a possibility of returning an unevaluated differential operator... Also consider: (13) -> D(f(x,x),x)    (13)  f  (x,x) + f  (x,x)           ,2         ,1                                                      Type: Expression Integer (which is correct)

Fri 04 Jun 2004 08:28:53 AM UTC, comment #1:  I forgot to add the following: (17) -> eval(z,x,2)    (17)  %defsum  (g(%C),%C,i,a,2)                 ,5                                                      Type: Expression Integer is questionable (but may be interpreted correctly) Martin	Martin Rubey <kratt6>
Fri 04 Jun 2004 08:26:31 AM UTC, original submission:    eval(D(f(x),x),f,y+->sum(g(i),i=a..y))    (9)  %defsum  (g(%A),%A,i,a,x)                ,5 although this is correct, it looks rather strange... Worse: (12) -> eval(D(f(x),x),f,y+->sum(g(i,y),i=a..y))    (12)  %defsum  (g(%A,%%01),%A,i,a,x)                 ,5                                                      Type: Expression Integer	Martin Rubey <kratt6>

 

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