lotest

Scilab Function

lotest - demo of the Lorenz attractor

[]=lotest([f_l,odem,xdim,npts,pinit])

[y]=lorenz(t,x)

[]=ilo(sig,ro,beta)

[]=ilof(sig,ro,beta)

f_l : can be "loren" or lorenz. it is the name of the external for the Lorenz system. "loren" will use a Fortran coded version of the lorenz system and arnold will and loren will use a Scilab coded version.lorentz is the Scilab macro which code the lorenz system. This macro is loaded when calling lotest.
ilof, ilo :are used to fix the parameters of the Fortran and Scilab code version of the Lorenz system.
odem,xdim,npts : are optional arguments. Their meaning and syntax can be found in the portr3d help

A call to the function lotest() will interactively display a phase portrait of a the following dynamical system

 y(1)=sig*(x(2)-x(1));
 y(2)=ro*x(1) -x(2)-x(1)*x(3);
 y(3)=-beta*x(3)+x(1)*x(2);