PrimeOperator

Prime Operator (Differentiation)

This PG code shows how to allow the prime operator for differentiation.

Problem Techniques Index

PG problem file	Explanation
DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", "parserPrime.pl", "parserAssignment.pl", ); TEXT(beginproblem());	Initialization: We need to include the macros file parserPrime.pl.
Context("Numeric")->variables->add(y=>"Real"); Context()->constants->add(k=>0.01); Context()->flags->set(formatStudentAnswer=>'parsed'); parser::Assignment->Allow; # only use partial derivatives with respect to x parser::Prime->Enable("x"); $answer1 = Formula("y = k x'"); $answer2 = Formula("(x^2)' + (y^2)'"); parser::Prime->Disable;	Setup: We need to enable the prime operator, and ought to also specify the variable for partial differentiation.
BEGIN_TEXT Enter the equation \( y = k x' \) or \( y = k \): \{ ans_rule(20) \} $PAR Since we defined the prime operator as the partial derivative with respect to \( x \), enter the expression \( (x^2+y^2)' \) or \( 2x \): \{ ans_rule(20) \} END_TEXT	Main Text: The problem text section of the file is as we'd expect.
$showPartialCorrectAnswers = 1; ANS( $answer1->cmp() ); ANS( $answer2->cmp() ); ENDDOCUMENT();	Answer Evaluation: As is the answer.

Problem Techniques Index

• POD documentation: parserPrime.pl.html
• PG macro: parserPrime.pl