Difference between revisions of "Logarithms1"
Paultpearson (talk  contribs) m 
Paultpearson (talk  contribs) 

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This PG code shows how to disable and undefine some functions and operators, which will require students to simplify their answer using laws of logarithms. 
This PG code shows how to disable and undefine some functions and operators, which will require students to simplify their answer using laws of logarithms. 

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−  * Download file: [[File:Logarithms1.txt]] (change the file extension from txt to pg when you save it) 

+  * File location in OPL: [https://github.com/openwebwork/webworkopenproblemlibrary/blob/master/OpenProblemLibrary/FortLewis/Authoring/Templates/Algebra/Logarithms1.pg FortLewis/Authoring/Templates/Algebra/Logarithms1.pg] 

−  * File location in NPL: <code>FortLewis/Authoring/Templates/Algebra/Logarithms1.pg</code> 

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Revision as of 23:23, 15 June 2013
Answer Must Be Simplified Using Logarithms
This PG code shows how to disable and undefine some functions and operators, which will require students to simplify their answer using laws of logarithms.
 File location in OPL: FortLewis/Authoring/Templates/Algebra/Logarithms1.pg
PG problem file  Explanation 

Problem tagging: 

DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", "AnswerFormatHelp.pl", ); TEXT(beginproblem()); 
Initialization: 
Context("Numeric"); Context()>variables>are(x=>"Real",y=>"Real",z=>"Real"); Context()>variables>set(x=>{limits=>[2,3]}); Context()>variables>set(y=>{limits=>[2,3]}); Context()>variables>set(z=>{limits=>[2,3]}); $a = random(20,40,1); $b = random(20,40,1); do { $c = random(20,40,1); } until ( $c != $b ); # TeX $expr = "\displaystyle \ln \left( \frac{ x^{$a} y^{$b} }{ z^{$c} } \right)"; $answer = Compute("$a * ln(x) + $b * ln(y)  $c * ln(z)"); Context()>operators>undefine("/","^","**"); Context()>functions>undefine("sqrt"); 
Setup:
We add the variables to the context and reset their limits since logarithms are not defined on the default domain 
Context()>texStrings; BEGIN_TEXT Using laws of logarithms, write the expression below using sums and/or differences of logarithmic expressions which do not contain the logarithms of products, quotients, or powers. $BR $BR \( \displaystyle $expr = \) \{ ans_rule(40) \} \{ AnswerFormatHelp("formulas") \} END_TEXT Context()>normalStrings; 
Main Text: 
$showPartialCorrectAnswers = 1; ANS( $answer>cmp() ); 
Answer Evaluation: 
Context()>texStrings; BEGIN_SOLUTION ${PAR}SOLUTION:${PAR} Solution explanation goes here. END_SOLUTION Context()>normalStrings; COMMENT('MathObject version.'); ENDDOCUMENT(); 
Solution: 