artest - arnold dynamical system
: 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.
: is used to fix the values of a in the Scilab coded case. a is a vector of size 6.
: 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 :