AnswerUpToMultiplication1

This article has been retained as a historical document. It is not up-to-date and the formatting may be lacking. Use the information herein with caution.

This problem has been replaced with a newer version of this problem

Answer is a Function up to Multiplication by a Nonzero Constant

Click to enlarge

This PG code shows how to

• File location in OPL: FortLewis/Authoring/Templates/Precalc/AnswerUpToMultiplication1.pg
• PGML location in OPL: FortLewis/Authoring/Templates/Precalc/AnswerUpToMultiplication1_PGML.pg

Templates by Subject Area

PG problem file	Explanation
Problem tagging data	Problem tagging:
DOCUMENT(); loadMacros( 'PGstandard.pl', 'MathObjects.pl', 'PGML.pl', 'PGcourse.pl' ); TEXT(beginproblem());	Initialization:
Context('Numeric'); $sol_str = '(x-2)*(x+1)'; $ans = Compute($sol_str)->cmp(checker => sub { my ( $correct, $student, $self ) = @_; my $context = Context()->copy; return 0 if $student == 0; $context->flags->set(no_parameters=>0); $context->variables->add('C0'=>'Parameter'); my $c0 = Formula($context,'C0'); $student = Formula($context,$student); $correct = Formula($context,"$c0 * $sol_str"); return $correct == $student; });	Setup: We use a local context with an adaptive parameter to check the answer. For more on adaptive parameters, see AdaptiveParameters. This builds a custom checker that checks if the student answer is a parameter C0 multiple of the correct answer in $sol_str.
BEGIN_PGML Find a quadratic equation in terms of the variable [` x `] with roots [` -1 `] and [` 2 `]. [` y = `] [______________]{$ans} [@ helpLink('formulas') @]* END_PGML	Main Text:
BEGIN_PGML_SOLUTION Solution explanation goes here. END_PGML_SOLUTION ENDDOCUMENT();	Solution:

Templates by Subject Area