Variable substitution - PGML
Frequently, you will have computed or randomly generated values that you want to include in the text of your problem. To insert the value of a
$a into PGML, use
[$a]. Such values can be inserted into the text anywhere, including inside math delimiters.
Suppose a manufacturer produces [$n] cars at a cost of [$cost] per car.
Suppose [`f(x) = [$f]`]. Then [`f'(x) = `] [_________________].
Suppose [: f(x) = [$f] :]. Then [: f'(x) = :] [_________________].
In the first example, the values of
$cost are inserted as plain text. In the second, example, if
$f is a MathObject Formula, then its TeX form will be inserted and processed as TeX code (due to the
[`...`] delimiters. In the third example, the Formula object's algebra string will be inserted into the math and processed in the Typeset Context to generate the mathematical output.