[LON-CAPA-users] Forcing students to submit valid expressions for formula responses.
Peter Dencker
dencker at math.uni-luebeck.de
Wed Oct 30 21:11:03 EDT 2013
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: afindlay at 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
dencker at math.uni-luebeck.de
www.math.uni-luebeck.de
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