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STACK: numerical tolerance of "ta: decimalplaces(subst([..." answer

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STACK: numerical tolerance of "ta: decimalplaces(subst([..." answer

by Miro Iliaš - Thursday, December 17, 2020, 7:51 PM

Hello,

in STACK questions I am often reading numbers given by various formulas, like

ta: decimalplaces(subst([m=mx,Mh=Mhx,Mb=Mbx],my_expression),2);

Please how do I introduce the numerical tolerance check of this @ta@ student answer, let say +/- 0.2 ?

Thanks.

Re: STACK: numerical tolerance of "ta: decimalplaces(subst([..." answer

by Stephan Bach - Friday, December 18, 2020, 4:56 PM

Hi,
can't you just use NumAbsolute as your answer test?
Stephan

Average of ratings:Useful (2)

Re: STACK: numerical tolerance of "ta: decimalplaces(subst([..." answer

by Miro Iliaš - Saturday, December 19, 2020, 7:25 AM

Thanks Stefan ! This works in PRT. Now I wonder, how to include more tolerance intervals to the answer test, let say +/- 0.2 is without penalty, but +/- 0.3 gives 10 percent penalty ?

Average of ratings: -

Re: STACK: numerical tolerance of "ta: decimalplaces(subst([..." answer

by Stephan Bach - Saturday, December 19, 2020, 7:28 PM

Hi,
you can just add another node to your PRT:
In the first node you use NumAbsolute with the option 0.2 and score 1. If this evaluates to false you go to the other node and then use NumAbsolute lets say with the option 0.3 and score 0.9.
Stephan

Average of ratings:Useful (1)

Re: STACK: numerical tolerance of "ta: decimalplaces(subst([..." answer

by Miro Iliaš - Monday, December 21, 2020, 8:30 PM

Excellent ! Thanks ! This works, we can push the STACK evaluation possibilities further.

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