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Aide de Scilab >> Xcos > Batch functions > lincos


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

Calling Sequence

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

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Last updated:
Thu Oct 02 13:54:43 CEST 2014