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: |
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Example of code trigerring the bug: | eval(D(f(x),x),f,y+->sum(g(i,y),i=a..y)) |
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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...
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Fri 04 Jun 2004 08:28:53 AM UTC, comment #1: |
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)) |
Martin Rubey <kratt6> |
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Follows 1 latest change.
Date | Changed by | Updated Field | Previous Value | => | Replaced by |
---|---|---|---|---|---|
2008-11-25 | axiom | 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) | ![]() |
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) |
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