AnswerUpToMultiplication1
Jump to navigation
Jump to search
Answer is a Function up to Multiplication by a Nonzero Constant
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
| PG problem file | Explanation |
|---|---|
|
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 == $student;
});
|
Setup:
We use a local context with an adaptive parameter to check the answer. For more on adaptive parameters, see AdaptiveParameters. This builds a custom checker that checks if the student answer is a parameter |
BEGIN_PGML
Find a quadratic equation in terms of the variable
[` x `] with roots [` -1 `] and [` 2 `].
[` y = `] [______________]{$ans}
[@ helpLink('formulas') @]*
END_PGML
|
Main Text: |
BEGIN_PGML_SOLUTION Solution explanation goes here. END_PGML_SOLUTION ENDDOCUMENT(); |
Solution: |
