Enter any function formula in the textbox, using POOL syntax for the mathematical expressions. Use
`:x`

variable as the function's argument, e.g.: `2 * :x + 1`

or `log :x^2`

.

Program compiles and runs the code from textbox for `:x`

in the range adjusted to the current drawing
scale. Change of the drawing scale or resize/scroll of the window raises the "worldchanged" event. Handling
function for this event redraws the plot.

Turn on the coordinate system in POOL options. You can change there also x and y scales and the center shift.
Such changes will cause the automatic redraw.

The function value is calculated with the following expression:
`"y := run :fn`

,
where `:fn`

is the list that contains the function formula. This
allows for execution of formulas more complex than a single equation. Try to enter in the textbox e.g.:
`let "r (runif 0 1) :r^2`

.