[Maxima-bugs] [ maxima-Bugs-2723549 ] diff display error for non-int. order and derivabbrev: true

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Bugs item #2723549, was opened at 2009-03-31 18:15
Message generated for change (Comment added) made by crategus
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Category: None
Group: None
>Status: Pending
>Resolution: Works For Me
Priority: 5
Private: No
Submitted By: Martin (m-h-s)
Assigned to: Nobody/Anonymous (nobody)
Summary: diff display error for non-int. order and derivabbrev: true

Initial Comment:
for non-integer order of the derivative, diff can't display anything when derivabbrev: true, see example below.

(%i1) derivabbrev: false;
(%o1) false
(%i2) this:diff(f(x), x, n);
(%o2) 'diff(f(x),x,n)
(%i3) derivabbrev: true;
(%o3) true
(%i4) this;
Maxima encountered a Lisp error:
 Error in > [or a callee]: $N is not of type (OR RATIONAL LISP:FLOAT).
Automatically continuing.
To reenable the Lisp debugger set *debugger-hook* to nil.

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>Comment By: Dieter Kaiser (crategus)
Date: 2010-06-05 01:16

Message:
With the current CVS version of Maxima I can not reproduce the reported
problem:

Maxima version: 5.20post
Maxima build date: 21:58 6/4/2010
Host type: i686-pc-linux-gnu
Lisp implementation type: SBCL
Lisp implementation version: 1.0.29.11.debian

(%i1) derivabbrev:false$
(%i2) this:diff(f(x),x,n);
(%o2) 'diff(f(x),x,n)
(%i3) derivabbrev:true$
(%i4) this;
(%o4) 'diff(f(x),x,n)

Perhaps, it is a problem with an earlier version of Maxima. We have no
build_info for this bug report.
Setting the status to pending and the resolution to "works for me".
Dieter Kaiser

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