Use this app to visualize in real time what is the response of a system when you position its poles and zeros.
How to use:
Click and drag the singularities (poles or zeros) to change their position
Left click to add a complex pair of poles (press shift to add a single real pole)
Alt-Left click to add a complex pair of zeros (press shift to add a single real zero)
Press ESC key to reset the diagram
You can also chose the system domain (discrete / continuous), pick the input to simulate and see the transfer function when you mode the poles and/or zeros around.