[Maxima-bugs] [ maxima-Bugs-639880 ] ode2 internal error for invalid input

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Bugs item #639880, was opened at 2002-11-17 21:03
Message generated for change (Comment added) made by robert_dodier
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>Category: Lisp Core
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Stavros Macrakis (macrakis)
Assigned to: Nobody/Anonymous (nobody)
Summary: ode2 internal error for invalid input

Initial Comment:
ode2('diff(y,x,3)=0,y,x) =>

  $STATUS is invalid as a function

I realize that ode2 is only supposed to handle 1st and 
2nd order, but it should fail more gracefully.

Same error for 

similarly for ode2('diff(y,x)^2=1,y,x);

(Maxima 5.5)


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>Comment By: Robert Dodier (robert_dodier)
Date: 2006-06-30 22:21

Message:
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user_id=501686

Appears to have been fixed by r1.2 src/ode2.lisp. At present
the above examples provoke "Not a proper differential
equation" which I guess is OK although perhaps not maximally
informative. Closing this report as fixed.

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