EquationsDefiningFunctions: Difference between revisions
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<b>Setup:</b> | <b>Setup:</b> | ||
We must allow assignment, and declare any function names we wish to use. For more details and examples in other MathObjects contexts, see [http://webwork.maa.org/ | We must allow assignment, and declare any function names we wish to use. For more details and examples in other MathObjects contexts, see [http://webwork.maa.org/pod/pg_TRUNK/macros/parserAssignment.pl.html parserAssignment.pl.html] | ||
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[[Category:Problem Techniques]] | [[Category:Problem Techniques]] | ||
Revision as of 05:49, 16 December 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 contexts, see parserAssignment.pl.html |
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. |