lotest

lotest — demo of the Lorenz attractor

Calling sequence

[]=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);