[Maxima-bugs] [ maxima-Bugs-1330685 ] "display: failed to break up a long expression

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Bugs item #1330685, was opened at 2005-10-18 22:44
Message generated for change (Comment added) made by robert_dodier
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Category: Lisp Core
Group: None
Status: Open
Resolution: Accepted
Priority: 2
Private: No
Submitted By: Robert Dodier (robert_dodier)
Assigned to: Nobody/Anonymous (nobody)
Summary: "display: failed to break up a long expression

Initial Comment:
I find that with the following batch file

--------- begin bug.mac ---------
linel:79;
linenum:87;
fpprec:131;
a:1/7.0B+0;
b:1234B-22;
ldisplay(a-b);
----------  end bug.mac ----------

then batch ("bug.mac"); => "Expression is too wide to
be displayed" repeatably.

If this stuff is typed at the command prompt it doesn't
happen
(output layout is slightly different so it doesn't
tickle the bug).

The error message originates in CHECKBREAK in
src/displa.lisp.

Maxima version: 5.9.2
Maxima build date: 0:2 10/11/2005
host type: i686-pc-linux-gnu
lisp-implementation-type: GNU Common Lisp (GCL)
lisp-implementation-version: GCL 2.6.7

(but also reported on the mailing list to exist in 5.9.1)

----------------------------------------------------------------------

Comment By: Robert Dodier (robert_dodier)
Date: 2011-07-05 18:03

Message:
I've reopened this item. It's possible to find other values which trigger
the bug. See the session pasted below.

$ maxima

Maxima 5.22.1 http://maxima.sourceforge.net
using Lisp GNU Common Lisp (GCL) GCL 2.6.7 (a.k.a. GCL)
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
The function bug_report() provides bug reporting information.
(%i1) linel:79;
(%o1)                                 79
(%i2) linenum:87;
(%o87)                                87
(%i88) fpprec:131;
(%o88)                                131
(%i89) a:1/7.0B+0;
(%o89)
1.428571428571428571428571428571428571428571428571428571428571428571428\
5714285714285714285714285714285714285714285714285714285714286b-1
(%i90) b:1234B-22;
(%o90)                             1.234b-19
(%i91) ldisplay(a-b);
(%t91)
1.428571428571428571428571428571428571428571428571428571428571428571428\
5714285714285714285714285714285714285714285714285714285714286b-1
 + (- 1.234b-19) =
1.428571428571428570194571428571428571428571428571428571428\
5714285714285714285714285714285714285714285714285714285714285714285714286b-1

(%o91)                              [%t91]
(%i92) linenum:100;
(%o100)                               100
(%i101) linel:99;
(%o101)                                         99
(%i102) fpprec:137;
(%o102)                                         137
(%i103) ldisplay(a-b);
(%t103)
1.4285714285714285714285714285714285714285714285714285714285714285714285714285714285714285\
714285714285714285714285714285714285714286b-1 + (-
1.233999999999999999999999999999999999999999999\
9999999999999999999999999999999999999999999999999999999999999999999999999999999999999992133b-19)
= 
display: failed to break up a long expression.
display: change 'linel' slightly and try again.


----------------------------------------------------------------------

Comment By: Dieter Kaiser (crategus)
Date: 2011-07-02 12:26

Message:
The reported bug seems to be no longer present in Maxima 5.24post. When
loading the batch file from above the result is

(%i1) load("bug.mac");
(%t87)
1.428571428571428571428571428571428571428571428571428571428571428571428\
5714285714285714285714285714285714285714285714285714285714286b-1
 + (- 1.234b-19) =
1.428571428571428570194571428571428571428571428571428571428\
5714285714285714285714285714285714285714285714285714285714285714285714286b-1

(%o87)                              bug.mac

Setting the resolution to "Works for me" and the status to "Pending".

Dieter Kaiser

----------------------------------------------------------------------

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