phase portrait

[Arnau Mir Torres]

Hello.
I want to plot a phase portrait for a system of differential equations 
of the form:

xdot= f(t,x,y)
ydot= g(t,x,y)

where t is the independent variable.

I want to plot in the x-y plane coordinates the phase portrait of the 
previous differential equation.

Somebody can tells me if there exists a package or a script in octave 
that does it?

Thanks in advance,
Arnau.


--
Arnau Mir Torres
Director Departament Matemàtiques i Informàtica.
Universitat de les Illes Balearss.
Edifici A. Turmeda, Campus de la UIB.
Crta. de Valldemossa, km. 7,5.
07122 Palma de Mallorca.
Baleares.
Spain.
Phone: +34 971 172987
Fax: +34 971 173003
e-mail: address@hidden
web: http://dmi.uib.es/~arnau



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