Function Reference

dsort

Sort discrete-time poles by magnitude

Syntax

• s = dsort(p)
  [s,ndx] = dsort(p)
  

Description

dsort sorts the discrete-time poles contained in the vector p in descending order by magnitude. Unstable poles appear first.

When called with one lefthand argument, dsort returns the sorted poles in s.

[s,ndx] = dsort(p) also returns the vector ndx containing the indices used in the sort.

Example

Sort the following discrete poles.

• p =
    -0.2410 + 0.5573i
    -0.2410 - 0.5573i
     0.1503         
    -0.0972         
    -0.2590 
  
  s = dsort(p)
  
  s =
    -0.2410 + 0.5573i
    -0.2410 - 0.5573i
    -0.2590         
     0.1503         
    -0.0972 
  

Limitations

The poles in the vector p must appear in complex conjugate pairs.

See Also
eig         Calculate eigenvalues and eigenvectors

esort, sort Sort system poles

pole        Compute system poles

pzmap       Pole-zero map

zero        Compute (transmission) zeros

drss

dss