ParametricPlots
Plotting Parametric Functions: PG Code Snippet
This code snippet shows the essential PG code to graph parametrically defined functions. Note that these are insertions, not a complete PG file. This code will have to be incorporated into the problem file on which you are working.
| PG problem file | Explanation |
|---|---|
loadMacros("PGgraphmacros.pl");
|
As with any dynamically generated graph, we need to include |
$gr = init_graph(-1.5,-1.5,1.5,1.5,axes=>[0,0]);
$xfunc = sub { my $t = shift();
return cos($t); };
$yfunc = sub { my $t = shift();
return sin($t); };
$fn = new Fun( $xfunc, $yfunc, $gr );
$fn->domain(0,6.2832);
|
To set up the parametric graph, we first define a graph object as for any dynamically generated graph. Then, we specify rules to generate the x and y positions of the parametric plot, and use these in a
Finally, we can set the t domain of the parametrically plotted function with the Note that this does not set up any default axis labels, so you may need to do that by adding labels. |
BEGIN_TEXT
\{ image( insertGraph($gr) ) \}
END_TEXT
|
The graph is then inserted into the problem in the usual manner. |
