Hi,
Or can someone finds similarities of the hosts 'mtal1' and 'scll1'
that may cause this bug :-/ ?
Yes, that is a good observation.
Both mtal1 and scl1 are running a Linux distro for which the distro's
standard repos provide maxima rev. 5.23
The majority of other LON-CAPA servers in the production cluster use
distros for which the maxima version is 5.20.
In the case of a syntax error, maxima 5.23 outputs "incorrect syntax"
instead of "Incorrect syntax" as it did in previous versions.
The result of this change in case is that LON-CAPA's lonmaxima daemon
rev. 1.40 included with LON-CAPA 2.10.1, and earlier, will not respond
with a "BAD_FORMULA" response (which causes display of: "Unable to
understand formula" as feedback to the student), but instead will
timeout with (a much less helpful) display of: "An internal error
occurred while processing your answer. Please try again later."
Anyway LON-CAPA servers with Linux distros with maxima 5.23 and later
(i.e., CentOS/Scientific Linux/RHEL 6, SLES 10/11, Fedora 14 and
later, SuSE 11.1 and later) should have someone with root access to
the server update /home/httpd/perl/lonmaxima to rev. 1.41 as follows:
wget -O /home/httpd/perl/lonmaxima
'http://source.loncapa.org/cgi-bin/cvsweb.cgi/~checkout~/loncom/lonmaxima?rev=1.41;content-type=text%2Fplain'
/etc/init.d/loncontrol restart
As restarting the LON-CAPA daemons impacts users, this action should
be scheduled for a time of limited user activity.
Note: lonmaxima rev. 1.42 (which also includes the fix for bug 6653 to
address occurrences of "code ran too long" a different origin -- this
time seen only sporadically, and also on Linux distros besides
CentOS/Scientific Linux/RHEL 6 -- which Justin had remarked on in an
earlier post in this thread is included in the forthcoming LON-CAPA
2.11.0.
Stuart Raeburn
LON-CAPA Academic Consortium
Quoting Peter Dencker <denc...@math.uni-luebeck.de>:
Hi,
you wrote
Right now my LON-CAPA server times out on them,
and asks them to try again later.
I've tested it: You seem to suffer by the same strange maxima-bug
on host 'mtal1', see the 'catching maxima errors'-threads on
http://mail.lon-capa.org/pipermail/lon-capa-users/2012-November
The problem is still unsolved.
Therefore you have to check *all* syntax errors.
This was the initial motivation for my library-project.
Maybe I can offer a preliminary workaround-library ...
Or can someone finds similarities of the hosts 'mtal1' and 'scll1'
that may cause this bug :-/ ?
- Peter
Am 21.10.2013 16:23, schrieb Angus Findlay:
When I give students formula response questions some of them don't
submit valid mathematic expressions. The most common problems are:
1) Not having balanced brackets. (i.e. number of left brackets do
not match number of right brackets)
2) Including invalid characters, such as quotation signs.
3) Not including brackets, when necessary. (eg. 2^-1/2 instead of 2^(-1/2))
I want to tell them that the expression is invalid, tell them why,
and allow them to enter it again, without penalty. (Right now my
LON-CAPA server times out on them, and asks them to try again later.)
Is there a piece of standard code I can use for this, or if not,
what it the easiest to implement a solution to this?
Thanks in advance.
Respectfully,
----------------------------------------------
Mr. Angus Findlay
Math Department, Mount Allison University
Sackville, New Brunswick
email: afind...@mta.ca tel: 506-364-2592
----------------------------------------------
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--
Dr. Peter Dencker
wissenschaftl. Mitarbeiter
UNIVERSITÄT ZU LÜBECK
INSTITUT FÜR MATHEMATIK
Ratzeburger Allee 160
23562 Lübeck
Tel +49 451 500 4254
Fax +49 451 500 3373
denc...@math.uni-luebeck.de
www.math.uni-luebeck.de
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Stuart Raeburn, Ph.D. LON-CAPA (cell) +1 517 881-3308
Dept. Physics & Astronomy Other (cell) +1 734 277-2795
Michigan State University raeb...@msu.edu
MI 48824 USA
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