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Function Reference: rlocus

Function File: rlocus (sys)
Function File: [rldata, k] = rlocus (sys, increment, min_k, max_k)

Display root locus plot of the specified SISO system.

Inputs

sys
LTI model. Must be a single-input and single-output (SISO) system.
increment
The increment used in computing gain values.
min_k
Minimum value of k.
max_k
Maximum value of k.

Outputs

rldata
Data points plotted: in column 1 real values, in column 2 the imaginary values.
k
Gains for real axis break points.

Block Diagram

 
  u    +         +---+      +------+             y
 ------>(+)----->| k |----->| SISO |-------+------->
         ^ -     +---+      +------+       |
         |                                 |
         +---------------------------------+

See also: rlocusx

Source Code: rlocus 

 s = tf('s');
 g = (s^2+2*s+2)/(s*(s^4+9*s^3+33*s^2+51*s+26));
 rlocus(g);
plotted figure