[Maxima-bugs] [ maxima-Bugs-1812669 ] integration variable is global, should be local

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Bugs item #1812669, was opened at 2007-10-12 23:20
Message generated for change (Comment added) made by macrakis
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Category: Lisp Core - Integration
Group: None
>Status: Closed
>Resolution: Invalid
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: integration variable is global, should be local

Initial Comment:
jj...@sb...
--Maxima version: 5.13.0Maxima build date: 20:4 9/10/2007host type: i686-pc-mingw32lisp-implementation-type: GNU Common Lisp (GCL)lisp-implementation-version: GCL 

t:0;
integrate(t,t);
Attempt to integrate wrt a number: 0
 -- an error.  To debug this try debugmode(true);

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>Comment By: Stavros Macrakis (macrakis)
Date: 2007-10-17 16:02

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This is not a bug.  The arguments to integrate, as to most functions, are
evaluated.

Thus:

  var: x$
  expr: x^2$
  integrate(expr,var) => x^3/3

You can quote them if you don't want them evaluated, e.g.

  integrate('expr,'var) => expr*var

rtoy: I think he wants integrate('t,'t), actually...


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Comment By: Raymond Toy (rtoy)
Date: 2007-10-17 08:50

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I'm not really familiar with all of maxima's evaluation rules, but this
makes sense to me.

Perhaps you really want to use integrate(t,'t)?


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