[Maxima-bugs] [ maxima-Bugs-2664752 ] xMaxima and wxMaxima: eivals causes multiple %o:s

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Bugs item #2664752, was opened at 2009-03-05 12:04
Message generated for change (Comment added) made by dmaj26
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Category: Xmaxima or other UI
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: David Ström (dmaj26)
Assigned to: Nobody/Anonymous (nobody)
Summary: xMaxima and wxMaxima: eivals causes multiple %o:s

Initial Comment:
----------------------------------------------------Maxima version: 5.17.0
Maxima build date: 19:8 12/4/2008
host type: i686-pc-mingw32
lisp-implementation-type: GNU Common Lisp (GCL)
lisp-implementation-version: GCL 2.6.8
----------------------------------------------------

a:matrix([1,3],[1,-1]);eigenvalues(a);

causes empty %o:s both in wxMaxima and xMaxima.
load(eigen) solves the problem. '? eivals' says:

     The package `eigen.mac' is loaded automatically when `eigenvalues'
     or `eigenvectors' is referenced.  If `eigen.mac' is not already
     loaded, `load ("eigen")' loads it.  After loading, all functions
     and variables in the package are available.

Shouldn't eigen.mac be autoloaded? Otherwise I would expect the output: 

%o eigenvalues(a)

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>Comment By: David Ström (dmaj26)
Date: 2009-03-08 09:56

Message:
Sorry, multiple %i:s it should be.
Another thing is that 'eivals(a)' causes just

%o eivals(a)

(no autoload, but not exactly the same bug as eigenvals)

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Comment By: Robert Dodier (robert_dodier)
Date: 2009-03-07 18:32

Message:
Fixed (I hope) by r1.53 src/mload.lisp.
Can someone with a Windows build environment please try it.


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Comment By: Robert Dodier (robert_dodier)
Date: 2009-03-07 16:39

Message:
Looks like the problem is due to combination of bugs, one in Maxima and one
in the Windows implementation of GCL.
(1) The eigenvalues function is automatically loaded the first time it is
referenced.
Maxima should suppress the prompt when loading the file.
(2) Windows GCL has a broken function READ-CHAR-NO-HANG: it always returns
NIL.
So Maxima thinks that it needs to print a prompt (to tell the user to
enter more input).

Probably the easiest thing is to tell Maxima to suppress the prompt while
loading the file.
Then the bug in READ-CHAR-NO-HANG might have no effect.

By the way, I see multiple %i input prompts. To the original poster: are
you seeing %o or %i prompts?


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