Phase portraits

Click on a canvas to recenter function display. Mouse wheel on canvas does zoom in/zoom out.
Red border around canvas means that the phase portrait is still being rendered. When border turns blue, the rendering is complete and it is ok to save the image.
Complex function evaluation engine is provided by Math.js. Please see its page for the syntax and capabilities.
"User function" must be algebraic expression in variable z. It is possible to use all functions available in Math.js. Two complex parameters, a and c, are avialable for use in function definition. These parameters may be changed interactively using the handles in the plot parameters form.