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 the variables for the answers in the problem are set at the beginning of the setup section. In this case, the variables y, z and t are added as Real numbers.

The variable rho is also added as a Real number. Its TeX representation is specified to be \rho which means that if an answer that uses the variable is displayed in math mode, then the variable will appear as the Greek letter rho.

If the variables were set with Context()->variables->are instead, then all other variables in the context would be deleted, and if a removed variable were used in a student answer the message “Variable ‘?’ is not defined in this context” would be shown.

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.