Adding Variables to the Context

Add variables to the context.

Complete Code

PG problem file

Explanation

DOCUMENT();
loadMacros('PGstandard.pl', 'PGML.pl', 'PGcourse.pl');

Preamble

These standard macros need to be loaded.

Context()->variables->add(t => 'Real', y => 'Real', z => 'Real');
$f = Compute('-16 t^2 + 5 t + 4');
$g = Compute('x^2+y^2+z^2');

Context()->variables->add(rho => [ 'Real', TeX => '\rho' ]);
$h = Compute("sqrt(1+rho^2)");

Setup

Typically you either add or set the variables for the entire problem at the top of the setup section. In this case, we add y, z and t, all real numbers.

This allows us to use a greek letter as a variable. Note that we have used add for this. If we set this with are, then the other variables will be deleted upon answer checked and the student will get a variable not defined in this context error.

BEGIN_PGML
Enter the following formulas:

* [`[$f]=`] [____]{$f}
* [`[$g]=`] [____]{$g}
* [`[$h]=`] [____]{$h}
END_PGML

Statement

This is the problem statement in PGML.

BEGIN_PGML_SOLUTION
Solution explanation goes here.
END_PGML_SOLUTION

ENDDOCUMENT();

Solution

A solution should be provided here.