Scilab Home page | Wiki | Bug tracker | Forge | Mailing list archives | ATOMS | File exchange
Please login or create an account
Change language to: English - Português - 日本語 - Русский

Please note that the recommended version of Scilab is 6.0.2. This page might be outdated.
See the recommended documentation of this function

Aide de Scilab >> Xcos > Fonctions Batch > lincos


Constructs by linearization a linear state-space model from a general dynamical system described by a Xcos diagram


sys = lincos(scs_m [,x0,u0 [,param] ])


Construct a linear state-space system by linearizing a model given as a Xcos diagram. The idea is to transform a sub-diagram to a linear state-space model. The sub-diagram should have inputs and outputs.

The output is a Scilab data structure of type continuous-time state-space linear system.


// loading data

loadXcosLibs(); loadScicos();

// specific context data
M  = 10;
m  = 3;
l  = 3;
ph = 0.1;
z0 = -4;
th0 = .02;

// looking for the Superblock to linearize
for i=1:length(scs_m.objs)
    if typeof(scs_m.objs(i))=="Block" & scs_m.objs(i).gui=="SUPER_f" then
        scs_m = scs_m.objs(i).model.rpar;

sys = lincos(scs_m);



  • scs_m : a xcos data structure

  • x0 : column vector. Continuous state around which linearization to be done (default 0)

  • u0 : column vector. Input around which linearization to be done (default 0)

  • param : param: list with two elements (default list(1.d-6,0)) param(1): scalar. Perturbation level for linearization; the following variation is used del([x;u])_i = param(1)+param(1)*1d-4*abs([x;u])_i. param(2): scalar. Time t.

  • sys : state-space system

See Also

  • steadycos — Finds an equilibrium state of a general dynamical system described by a xcos diagram
  • scicos_simulate — Function for running xcos simulation in batch mode
Scilab Enterprises
Copyright (c) 2011-2017 (Scilab Enterprises)
Copyright (c) 1989-2012 (INRIA)
Copyright (c) 1989-2007 (ENPC)
with contributors
Last updated:
Mon Feb 12 19:15:32 CET 2018