[LON-CAPA-users] Tolerances with Hints

Carl Lira lira at egr.msu.edu
Sun Feb 18 13:39:13 EST 2018

Hi Mark,

It looks like you are wanting to display the tolerance in the hint? This can be done if you set the tolerance as a variable in the script. In the test environment this works OK. I have not tried to include it in a course. 

This problem provides hints if the answer is wrong but within 100% or 500%. Note that if the answer is within 100%, then both hints display because anything within 100% is also within 500%.

msu/lira/loncapa examples/conditional hints.problem

Code included here for quick reference:


<script type="loncapa/perl">
#Enter the computations here
$Tolerance = "10%"

<startouttext />
What is $a + $b?
<endouttext />

<part id="01">
<numericalresponse answer="$c" id="01a">
        <responseparam name="tol" type="tolerance" default="$Tolerance" description="Numerical
Tolerance" />
    <textline readonly="no" spellcheck="none" />

<hintgroup showoncorrect="no">
    <startouttext /><endouttext />

<numericalhint answer="$c" name="err100" id="11">
    <responseparam name="tol" type="tolerance" default="100%" description="Numerical
Tolerance" />

<numericalhint answer="$c" name="err500" id="12">
    <responseparam name="tol" type="tolerance" default="500%" description="Numerical
Tolerance" />

<hintpart on="err100">
    <startouttext />Your answer is within +- 100%. Required tolerance $Tolerance.<br /><endouttext />

<hintpart on="err500">
    <startouttext />Your answer is within +- 500%. Required tolerance $Tolerance.<br /><endouttext />

<hintpart on="default">
    <startouttext />Your answer is off by more than +- 500%. Required tolerance $Tolerance.<endouttext />


-----Original Message-----
From: lon-capa-users-bounces at mail.lon-capa.org [mailto:lon-capa-users-bounces at mail.lon-capa.org] On Behalf Of Lucas, Mark
Sent: Friday, February 16, 2018 10:43 AM
To: lon-capa-users at mail.lon-capa.org
Subject: [LON-CAPA-users] Tolerances with Hints


I am looking to include a hint in a problem that occurs if a response is inside a wider
tolerance (5%) but not within the requested tolerance (1%).

I created the following hint code and plugged this into a course to test it.
When I look at the parameters for the problem, the tolerance for id=“11” shows
5% (the tolerance used in the numericalhint tags), not 1%. I found this out
when I purposely entered an answer that was about 3% off and found that I got
it right.

I thought I had done something like this before, but may not have
tested it as rigorously as I thought (or I just may be deluding myself that I’ve
done this before).

Has anyone else tried this before? Is this a feature or a bug?


    <numericalresponse unit="J" format="3s" answer="$W" id="11">
      <responseparam name="tol" type="tolerance" default="1%" description="Numerical Tolerance" />
      <responseparam name="sig" type="int_range" default="3,6" description="Significant Figures" />
      <textline />
    <hintgroup showoncorrect="no">
      <numericalhint unit="J" format="3s" answer="$dEPE" name="wrongSign" id="12">
        <responseparam name="tol" type="tolerance" default="5%" description="Numerical Tolerance" />
        <responseparam name="sig" type="int_range" default="3,6" description="Significant Figures" />
      <numericalhint unit="J" format="3s" answer="$W" name="Tol" id="14">
        <responseparam name="tol" type="tolerance" default="5%" description="Numerical Tolerance" />
        <responseparam name="sig" type="int_range" default="3,6" description="Significant Figures" />
      <hintpart on="wrongSign">
        <startouttext />Remember that this is the work done BY the electric field, not the work done by you.<endouttext />
      <hintpart on="Tol">
        <startouttext />In this calculation you are adding a number of different terms, some of which are
          positive and some of which are negative. 
          There is some benefit to working this problem out algebraically and finding terms that
          might offset each other. Remember that your answer needs to be within a tolerance of about
          $Tolerance.<endouttext />

Mark Lucas 								email: lucasm at ohiou.edu
252D Clippinger Lab						phone: (740)597-2984
Department of Physics and Astronomy			fax: (740)593-0433
Ohio University
Athens, OH 45701

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