LimitedPowers

Restricting Allowed Powers (Exponents) in Student Answers

This PG code shows how to restrict the allowed powers in student answers.

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Problem Techniques Index

PG problem file	Explanation
DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", "PGcourse.pl", "contextLimitedPowers.pl", ); TEXT(beginproblem());	Initialization: Use contextLimitedPowers.pl to restrict what is allowed as arguments to exponentiation a^b.
Context("Numeric"); #LimitedPowers::NoBaseE(); # chose one of these three: #LimitedPowers::OnlyIntegers(); LimitedPowers::OnlyPositiveIntegers(); #LimitedPowers::OnlyNonNegativeIntegers(); $a = random(2,5,1);	Setup: This is the section where we restrict the allowed types of powers. For more options, see the POD documentation contextLimitedPowers.pl
Context()->texStrings; BEGIN_TEXT (a) Enter \( $a^3 \): \{ ans_rule(10) \} $BR (b) Enter \( 1/$a^3 \), not \( $a^{-3} \): \{ ans_rule(10) \} $BR (c) Enter \( 1/x^2 \), not \( x^{-2} \): \{ ans_rule(10) \} END_TEXT Context()->normalStrings;	Main Text: The problem text section of the file is as we'd expect.
$showPartialCorrectAnswers = 1; ANS( Real("$a^3")->cmp() ); ANS( Real("1/$a^3")->cmp() ); ANS( Compute("1/x^2")->cmp() ); ENDDOCUMENT();	Answer Evaluation: As is the answer.

Problem Techniques Index

• POD documentation: contextLimitedPowers.pl
• PG macro: contextLimitedPowers.pl