[LON-CAPA-users] Forcing students to submit valid expressions for formula responses.

[Angus Findlay]

Peter,

Thank you for your help. Although I can see and try out your problem, and I
can see that you are sharing your xml code, I don't see where I can see your
xml code within the LON-CAPA environment.

Should I be able to copy your code and include it in a problem of mine for
syntax checking? And if so, do I site the original code? (I am very new to
LON-CAPA, and if there is a standard practice I would like to know what it
is.)

Angus.


On 13-10-30 7:50 PM, "Peter Dencker" <dencker at math.uni-luebeck.de> wrote:

> 
> Hi,
> 
> I don't think that it is helpful to give hints for syntactically
> correct but semantically incorrect submissions: How can one know
> what the student means? Students have to learn to produce valid
> expressions. One could write simple problems for that purpose and
> a short manual.
> 
> In my option using customresponse is the appropriate method.
> You can find an example (source available) how to check your
> mentioned most common syntax problems in
> 
> 'scl/dencker/testing/examples/simple syntax check 1.problem'
> 
> This example is a (hopefully correct) reduction of a more
> ambitious library. The library has to be rewritten and is not finished
> yet - to put it mildly. I will keep you informed ...
> 
> - Peter
> 
> 
> Am 21.10.2013 16:23, schrieb Angus Findlay:
>> When I give students formula response questions some of them don¹t 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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>