Hi,
On Oct 17, 2013, at 7:08 AM, Jon Hall <jd...@bellsouth.net> wrote:
>
> Is there an easy way to access just the numeric portion of a student's
> submitted answer?
>
> In other words, if a student submits 54.6 m/s as an answer, is there a way to
> strip the non-numeric characters to use just the 54.6 as a point on a
> gnuplot, for example?
>
>
> So my script would include:
>
> $vi_submitted=&EXT('user.resource.resource.15.16.submission');
>
> but then what?
Not easy at all, since the number could include scientific notation, etc. The
regular expression used within LON-CAPA itself to make the separation is rather
complicated, and we needed to fix it more than once :-(.
But I would recommend against this anyway, since the number alone does not make
*any* sense. How would the plot consider the equivalence between 54.6 m/s and
0.0546 km/s?
If your problem expects certain units, I would recommend to give them to the
student. Either make the question text specify "in m/s" or write that behind
the answer box, e.g.
[ ] m/s
- Gerd.
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