Rather strange feedback

[msgj603]

Just putting this here in case it is useful.
This arose when allowing an alternative answer for a matrix question. The alternative answer gains the full 2 marks, but I do not know where it got 1.5 marks from.

[christianp]

Can you give me a link to the questoin on the editor, please?

[msgj603]

It's part (c) of this question: https://numbas.mathcentre.ac.uk/question/121681/matrix-arithmetic-mixed-2/

[christianp]

Thanks! I've managed to reproduce it by setting a variable testing condition to get exactly the same expected answer as in your screenshot.

At the moment it looks like there's a bug to do with not fully clearing the feedback while marking alternatives, which is surprising, but I'm now at the end of my working week so I'll have to leave this until Monday.

[christianp]

Well, it took until Wednesday, but this is now fixed.

The code to apply feedback from an alternative didn't reset the part's credit to 0, so it was only reporting the amount awarded in addition to whatever the main part awarded.