EquationsDefiningFunctions: Difference between revisions
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<em>This PG code shows how to check student answers that are equations that define functions.</em> | <em>This PG code shows how to check student answers that are equations that define functions. If an equation defines a function, it is much more reliable to use the this method of answer evaluation (via <code>parserAssignment.pl</code>) than the implicit equation method (via <code>parserImplicitEquation.pl</code>).</em> | ||
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<b>Setup:</b> | <b>Setup:</b> | ||
We must allow assignment, and declare any function names we wish to use. | We must allow assignment, and declare any function names we wish to use. For more details and examples in other MathObjects <code>Contexts</code>, see [http://webwork.maa.org/doc/cvs/pg_CURRENT/macros/parserAssignment.pl.html parserAssignment.pl.html] | ||
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Revision as of 06:40, 2 March 2010
Equations Defining Functions (Not Implicit)
This PG code shows how to check student answers that are equations that define functions. If an equation defines a function, it is much more reliable to use the this method of answer evaluation (via parserAssignment.pl) than the implicit equation method (via parserImplicitEquation.pl).
| PG problem file | Explanation |
|---|---|
DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", "parserAssignment.pl", ); TEXT(beginproblem()); |
Initialization:
We need to include the macro file |
Context("Numeric")->variables->are(x=>"Real",y=>"Real");
parser::Assignment->Allow;
parser::Assignment->Function("f");
$eqn = Formula("y=5x+2");
$f = Formula("f(x)=5x+2");
|
Setup:
We must allow assignment, and declare any function names we wish to use. For more details and examples in other MathObjects |
BEGIN_TEXT
Enter \( y = 5x+2 \) \{ ans_rule(20) \}
$BR
Enter \( f(x) = 5x+2 \) \{ ans_rule(20) \}
END_TEXT
|
Main Text: The problem text section of the file is as we'd expect. |
ANS( $eqn->cmp() ); ANS( $f->cmp() ); ENDDOCUMENT(); |
Answer Evaluation: As is the answer. |
- POD documentation: parserAssignment.pl.html
- PG macro parserAssignment.pl