Flot is a JavaScript plotting library for jQuery. While Dupal Flot is a module that provides an API to render "flots" in Drupal.
This is an example of how to plot a sinusoidal curve using Drupal Flot:
for($i=0; $i < M_PI * 6; $i+=0.25) {
$fd=new flotData($d);
$options = new flotStyle();
$variables = array(
                'element'=>array('style'=> "width:100%;height:400px"),
print theme('flot_graph', $variables);
I've included this code in a custom module function. Then I execute the function in the node body using the php filtering.