Install Octave 3.6.4 for Signal & Control System to replace Matlab

This tutorial use in ubuntu 12.04.

Octave 3.6.4 is latest update from official site.

Command to install in terminal :

sudo apt-get remove octave # If you have installed octave 3.2
sudo apt-add-repository ppa:picaso/octave
sudo apt-get update
sudo apt-get install octave

 sudo apt-get install liboctave-dev

 Download this package to use octave for signal & control system :

general 

miscellaneous

struct

optim

specfun

control

signal

image

Install package :

  sudo su

go to Download directory (ex: /Downloads)

run octave

 octave

 install all package was downloaded :

octave:2> pkg install general-1.3.2.tar.gz -auto
octave:3> pkg install miscellaneous-1.2.0.tar.gz -auto
octave:4> pkg install struct-1.0.10.tar.gz -auto
octave:5> pkg install specfun-1.1.0.tar.gz -auto
octave:6> pkg install control-2.4.2.tar.gz -auto
octave:7> pkg install signal-1.2.2.tar.gz -auto
octave:8> pkg install image-2.0.0.tar.gz -auto

Installation octave & octave package finished. Now, try to run some simulation.

Ex : Bode Diagram

octave:9> num=[0,0,0,20,20]
num =

    0    0    0   20   20

octave:10> den=conv([1,5,0],[1,2,10])
den =

    1    7   20   50    0

octave:11> sys=tf
tf2sos       tf2zp        tfestimate   tfpolyones  
tf2ss        tfe          tfpoly2str   tfpolyzeros 
octave:11> sys=tf(num,den)

Transfer function 'sys' from input 'u1' to output ...

               20 s + 20        
 y1:  ---------------------------
      s^4 + 7 s^3 + 20 s^2 + 50 s

Continuous-time model.
octave:12> w=logspace(-1,2,100)
w =

 Columns 1 through 6:

     0.10000     0.10723     0.11498     0.12328     0.13219     0.14175

 Columns 7 through 12:

     0.15199     0.16298     0.17475     0.18738     0.20092     0.21544

 Columns 13 through 18:

     0.23101     0.24771     0.26561     0.28480     0.30539     0.32745

 Columns 19 through 24:

     0.35112     0.37649     0.40370     0.43288     0.46416     0.49770

 Columns 25 through 30:

     0.53367     0.57224     0.61359     0.65793     0.70548     0.75646

 Columns 31 through 36:

octave:13> bode(sys,w)
octave:14> bode(sys,w)
octave:15> [Gm, pm, wcp, wcg]=margin(sys)
Gm =  3.1366
pm =  103.66
wcp =  4.0131
wcg =  0.44264
octave:16> GmdB=20*log10(Gm)
GmdB =  9.9293
octave:17> [GmdB pm wpc wcg]
error: 'wpc' undefined near line 17 column 12
octave:17> [Gm, pm, wpc, wcg]=margin(sys)
Gm =  3.1366
pm =  103.66
wpc =  4.0131
wcg =  0.44264
octave:18> [GmdB pm wpc wcg]
ans =

     9.92929   103.65727     4.01306     0.44264

octave:19> version
ans = 3.6.4