Moodle formulas units

Moodle formulas units

by Marko Nuskol -
Number of replies: 3

Hello.

I need help with entering a unit in Moodle formulas question.

 \[\text{S}\ \text{c}{{\text{m}}^{2}}\ \text{d}{{\text{m}}^{3/2}}\ \text{mo}{{\text{l}}^{-3/2}}\]

I can easily enter the full exponent (like \( mo{{l}^{3}} \) ) but I can't enter something like \[\text{mo}{{\text{l}}^{-3/2}}\]

I'm not talking about entering the unit inside the "Main question part" of a question but within the "Part 1 - Unit".

Here the SI unit will determine if the above entered unit is correct or not.

Thank you for any help (or ideas) you can provide.

Our Moodle version is 3.9
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In reply to Marko Nuskol

Re: Moodle formulas units

by Dominique Bauer -
Picture of Documentation writers Picture of Particularly helpful Moodlers Picture of Plugin developers
Some say that units of measurement raised to a power which is a fraction have no physical meaning. The BIPM does not mention any in its SI-brochure. Others say that they are nevertheless used in practice and give several examples.

They can't be used directly with the Formulas question, but the following workaround should work.

  • Let the students enter the unit as follows: "mol^(-3/2)".
  • In the question settings, set the unit to "foo1".
  • In the question text, add a script that interprets "mol^(-3/2)" as "foo1".

The interpretation of units raised to a fractional power might one day be implemented in the Formulas question, but in the meantime you can use the workaround.

Average of ratings: Useful (1)
In reply to Dominique Bauer

Re: Moodle formulas units

by Marko Nuskol -
I'm amazed every day how we manage to get a workaround for just about everything smile

Since the script is not my forte could you maybe post it here so that I (and others) can use it. Or a link where I can see how it is done.

Thank you again for the prompt reply to my problem.
Average of ratings: -
In reply to Marko Nuskol

Re: Moodle formulas units

by Marko Nuskol -

Our Moodle administrator (thx Zvonko) helped me with the jQuery code.

------------------------------

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>

<script>

$("#responseform").submit(function(event) {

$('.formulaspart').eq(2).find('.formulas_unit').val($('.formulaspart').eq(2).find('.formulas_unit').val().replace("S cm^2 dm^(3/2) mol^(-3/2)", "foo"));

});

</script>

------------------------------

.eq(2) - this number starts from 0 (part 1), 1 (part 2), etc..depends on the location of the unit you want to change.

"foo" is what I have put inside the unit box (you can put whatever you want.

Hope this can help someone.

Average of ratings: Useful (1)