Allow students to enter interval

[Alexander Holvoet]

Dear All

Is there any known extension for allowing students to enter an interval? We found out we could program this ourselves by combining different gaps, like in this demo: https://numbas.mathcentre.ac.uk/question/66237/numbas-demo-custom-marking-algorithms/preview/, but were wondering if there was a cleaner way.

Kind regards,

Alexander

[Ben Brawn]

Well, there's no problem with closed intervals (just use mathematical expression gap and get them to enter say [1,2] which JME will interpret as a list) but in general, I can't see a nicer way than writing your owning extension or marking algorithm. 

If it were me, I'd probably do something easy and ugly like drop-down menu for open or closed bracket, gap 1 for number, a comma, gap 2 for number, and another drop-down menu for open or closed bracket. 

[Christian Lawson-Perfect]

There isn't anything which would let the student write interval notation at the moment. There's an issue about this on GitHub at https://github.com/numbas/Numbas/issues/879 (most of the comments in that thread are about a separate request for a page showing help with notation, though). There's a big issue at https://github.com/numbas/Numbas/issues/677 about different kinds of notation that we want to support.

A parser that takes an opening square or round bracket, a number, a comma, another number, then a closing square or round bracket would be quite easy to make. But I haven't done it yet because I know that someone will then ask for something like [x, x+1], and then we have to decide what kinds of expressions you can write for the numbers.

I suppose you have to decide how you want to mark these intervals, as well: is it all-or-nothing, or do you give partial marks for each of the four components: two brackets, and two numbers?

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[Alexander Holvoet]

Dear Christian

Thanks for the response! We'll have to experiment with a custom marking algorithm to solve this ad-hoc.

Kind regards,

Alexander

Op wo 1 nov 2023 om 16:44 schreef Christian Lawson-Perfect <christia...@gmail.com>:

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