Robert Oostenveld r.oostenveld at FCDONDERS.RU.NL
Mon Mar 13 20:51:11 CET 2006

Hi Punita

There is no 3D plotting function, i.e. one that would assume that the
head is a surface in 3D space, and which would require to rotate the
head to get a full view of the sides. But there are plotting
functions for scalp topographies which assume that you have projected
the electrode locations on a 2D plane (i.e. a top view). They use
layout files (see for an example the *.lay files, they are plain
ascii). Alternatively, you can use the topoplot() function, which
either uses a layout file or which also allows you to specify the x,y
positions and the potential values at each site.


PS if you do want to plot your x/y/z/v data in 3D and be able to
rotate, you can use the undocumented and unsupported private/triplot
function. You should then copy it from the private folder into
fieldtip main. You then would do
 >>  triplot([x y z], [], v)

On 13 Mar 2006, at 6:48, Punita wrote:

> Hello,
> I am new to this group.  I was just wondering if there was a simple
> method
> in fieldtrip that would allow me to plot surface potential data on a
> spherical head surface.  As for my data - I have 3 arrays
> containing the x,
> y, and z coordinates on the surface of the head, and a 4th array that
> contains values of the potentials at these specified locations.
> Any help or pointers would be deeply appreciated.
> Thank you,
> Punita

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