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Topic: Fitting 3D data over time
Replies: 5   Last Post: Oct 18, 2004 7:54 AM

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Posts: 7
Registered: 12/7/04
Re: Fitting 3D data over time
Posted: Oct 16, 2004 7:03 PM
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I really dint catch you on that. I have a set of x,y,z co-ord with
vary w.r.t time how do I build a trajectory around them

Peter Spellucci wrote:
> In article <eeecda3.-1@webx.raydaftYaTP>,
> "Christoffer Johansson" <> writes:

> >Hi,
> >
> > I have a sets of positional data for points moving in 3D space

> over
> >time. I'm quite new with Matlab, and wonder if there is a way
> do a
> >curvefit/spline to this kind of data?
> >
> >Thanks!
> >
> >Christoffer

> so what you really have is a set of measurements
> (t(i),x(i),y(i),z(i))
> and want to fit a space curve (t,X(t),Y(t),Z(t)) through this.
> yes this is possible. for example you could use three splines for
> each of the
> coordinates. the problem is that if you use a smoothing spline with
> an adaptive
> number and adaptive position of nodes, then the resulting splines
> will have no
> common grid.
> but you can of course interpolate for a given time t on each of
> these three
> splines and obtain an estimate of the position there. the smoothing
> spline
> with variable number of nodes is in the spline toolbox.
> hth
> peter

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