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portr3d(1) Scilab Function portr3d(1)
NAME
portr3d - 3 dimensional phase portrait.
CALLING SEQUENCE
[]=portr3d(f,[odem,xdim,npts,pinit])
PARAMETERS
f : a Scilab external which gives the field of the dynamical system.
Hence it can be a macro name which computes the field at time t and
point x [y]=f(t,x,[u]) or a list list(f1,u1) where f1 is a macro of
type [y]=f1(t,x,u) or a character string
rest : The other parameters are optional. If omitted they will be asked
interactively
odem
: gives the integration method to use. The value "default" can be
used, otherwise see ode for a complete set of possibilities
npts
: a vector of size (2,10) [number-of-points,step] gives the step
for integration and the number of requested points. The solution
will be calculated and drawn for time=0:step:(step*[number-of-
points])
xdim
: [xmin,xmax,ymin,ymax,zmin,zmax] the boundaries of the graphic
frame.
pinit
: initial values for integration. A set of initial points can be
given in a matrix
pinit = [x0(1), x1(1),...., xn(1)
x0(2), x1(2),...., xn(2)
x0(3), x1(3),...., xn(3)].
DESCRIPTION
Interactive integration and display of a 3 dimensional phase portrait of a
dynamical system dx/dt=f(t,x,[u]) (where u is an optional parameter )
SEE ALSO
ode
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