artest

Scilab Function

artest - arnold dynamical system

artest(f_l,[odem,xdim,npts])

arnold(t,x)

iarf([a])

f_l : can be "arnold" or arnold. It is the name of the external for the arnold system. If f_l is set to "arnold" a Fortran coded version of the arnold system where a(1:6)=1 will be used and if f_l is set to arnold a Scilab coded version will be used . arnold is a Scilab macro coding the Arnold system. This macro is loaded when calling artest.
iarf : is used to fix the values of a in the Scilab coded case. a is a vector of size 6.
odem,xdim,npts : are optional arguments. Their meaning and syntax can be found in the portr3d help

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

      ydot(1)=a(1)*cos(y(2)) +a(2)*sin(y(3))
      ydot(2)=a(3)*cos(y(3)) +a(4)*sin(y(1))
      ydot(3)=a(5)*cos(y(1)) +a(6)*sin(y(2))