artest

artest — arnold dynamical system

Calling sequence

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))