..  4.02

XY plotting
===========

This program plots A1 vs A2 or (A1-A2) vs A2. It is useful for
plotting Lissajous figures and stdying RC circuits

.. image:: schematics/RCsteadystate.svg
	   :width: 300px
.. image:: pics/phase-from-xy-screen.png
	   :width: 300px

.. image:: pics/xyplot-screen.png
	   :width: 400px
	      

For the circuit shown above, we can plot the voltage across the
capacitor against the voltage across the resistor. It will form a
circle when they are equal.

- Select C = 1uF, R = 1 kOhm and plot (A1-A2) vs A2. Adjust the frequency to get a circle
