Poles and zeros are treated the same with regards creation, so we will look here at poles only. The meaning of a pole and a zero only becomes important when creating a pole/zero model.

Poles are specified by in the LTPDA Toolbox by a frequency, f, and (optionally) a quality factor, Q.

The following code fragment creates a real pole at 1Hz:

  	>> p1 = pole(1)
	---- pole 1 ----
	real pole: 1 Hz
	----------------
  
To create a complex pole, you can specify a quality factor. For example,
   >> p1 = pole(10, 4)
   ---- pole 1 ----
   complex pole: 10 Hz, Q=4 [-0.0019894+0.015791i]
   ----------------  
  
creates a complex pole at 10Hz with a Q of 4. You can also see that the complex representation is also shown, but only one part of the conjugate pair.