droots

Display transfer function on masked subsystem icon

Syntax

droots(zero, pole, gain)
droots(zero, pole, gain,'z')
droots(zero, pole, gain,'z-')

Description

droots(zero, pole, gain) displays the transfer function whose zero is zero, pole is pole, and gain is gain.

droots(zero, pole, gain,'z') and droots(zero, pole, gain,'z-') expresses the transfer function in terms of z or 1/z.

When Simulink^® draws the block icon, the initialization commands execute and the resulting equation appears on the block icon, as in the following examples:

• To display a zero-pole gain transfer function, enter

  droots(z, p, k)
  

  For example, the preceding command creates this icon for these values:

  z = []; p = [-1 -1]; k = 1;
  

  

If the parameters are not defined or have no values when you create the icon, Simulink software displays three question marks (? ? ?) in the icon. When you define parameter values in the Mask Settings dialog box, Simulink software evaluates the transfer function and displays the resulting equation in the icon.