Difference between revisions of "DisableFunctions1"
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<td style="backgroundcolor:#ffffdd;border:black 1px dashed;"> 
<td style="backgroundcolor:#ffffdd;border:black 1px dashed;"> 

<pre> 
<pre> 

−  Context(" 
+  Context("FractionNoDecimals"); 
−  $f1 = 
+  $f1 = Formula("cos(pi)"); 
−  $f2 = 
+  $f2 = Formula("sin(pi/3)"); 
−  
−  Context("FractionNoDecimals"); 

Context()>functions>disable("All"); 
Context()>functions>disable("All"); 

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<p> 
<p> 

<b>Setup:</b> 
<b>Setup:</b> 

+  We choose a context that requires fractions as answers and does not allow decimals. After constructing the formulas involving trig functions, we disable all functions and reenable the <code>sqrt()</code> function. This means that students are not allowed to type in fractions and square roots, but not much else (e.g., they'll get an error message if they type in a trig function). 

</p> 
</p> 

</td> 
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Revision as of 00:51, 2 December 2010
Disabling Functions so Students Must Simplify Answers
This PG code shows how to disable all functions and restrict student answers to fractions.
 Download file: File:DisableFunctions1.txt (change the file extension from txt to pg when you save it)
 File location in NPL:
NationalProblemLibrary/FortLewis/Authoring/Templates/Trig/DisableFunctions1.pg
PG problem file  Explanation 

Problem tagging: 

DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", "AnswerFormatHelp.pl", "contextFraction.pl", ); TEXT(beginproblem()); 
Initialization: 
Context("FractionNoDecimals"); $f1 = Formula("cos(pi)"); $f2 = Formula("sin(pi/3)"); Context()>functions>disable("All"); Context()>functions>enable("sqrt"); $answer1 = Compute("1"); $answer2 = Compute("sqrt(3)/2"); 
Setup:
We choose a context that requires fractions as answers and does not allow decimals. After constructing the formulas involving trig functions, we disable all functions and reenable the 
Context()>texStrings; BEGIN_TEXT Enter your answers as simplified fractions. $BR $BR \( $f1 = \) \{ ans_rule(20) \} \{ AnswerFormatHelp("fractions") \} $BR $BR \( $f2 = \) \{ ans_rule(20) \} \{ AnswerFormatHelp("fractions") \} END_TEXT Context()>normalStrings; 
Main Text: 
$showPartialCorrectAnswers = 1; ANS( $answer1>cmp() ); ANS( $answer2>cmp() ); 
Answer Evaluation: 
Context()>texStrings; BEGIN_SOLUTION ${PAR}SOLUTION:${PAR} Solution explanation goes here. END_SOLUTION Context()>normalStrings; COMMENT('MathObject version.'); ENDDOCUMENT(); 
Solution: 