[Maxima-bugs] [ maxima-Bugs-3062883 ] diff does not recognize indirect dependencies in expressions

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Bugs item #3062883, was opened at 2010-09-09 21:29
Message generated for change (Comment added) made by crategus
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Thomas Toulorge (toulorge)
Assigned to: Nobody/Anonymous (nobody)
Summary: diff does not recognize indirect dependencies in expressions

Initial Comment:
(%i1) depends([a,b],x);
(%o1)                            [a(x), b(x)]
(%i2) depends(x,t);
(%o2)                               [x(t)]
(%i3) diff(a,t); diff(b,t);
                                     da dx
(%o3)                                -- --
                                     dx dt
                                     db dx
(%o4)                                -- --
                                     dx dt
(%i5) diff(-a,t); diff(-b,t);
(%o5)                                  0
(%o6)                                  0
(%i7) diff(a*b,t); diff(a/b,t);
(%o7)                                  0
(%o8)                                  0

So the indirect dependency is recognized with only "a" or only "b", but not with expressions containing "a" or "b".  I did not have this problem in Maxima 5.21.1.

By the way, thank you for this great software, I find it very useful for my academic research!

Thomas. 

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Maxima version: 5.22.1
Maxima build date: 11:44 8/12/2010
Host type: x86_64-unknown-linux-gnu
Lisp implementation type: SBCL
Lisp implementation version: 1.0.29.11.debian

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>Comment By: Dieter Kaiser (crategus)
Date: 2010-09-09 22:53

Message:
Thank you very much for the bug report.
You are right. The bug has been introduced by me. I corrected one bug and
introduced a new.

I have already a more general implementation of the routine depends which
causes the problem. I will commit the correction soon.

Dieter Kaiser

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You can respond by visiting: 
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