Thread Subject: 4D data plotting

Hi,
I have 4 vectors x,y,z and i.
x,y,z are coordinate values
i is a representation of intensity

eg:
x = -0.0084, -0.0094,...
y = 0.004, 0.005,...
z = 1, 2,...
i = 0.005, 0.001,...
...and so on

how can i plot this data onto a 3d graph so that the
intensity is represented by a color? (similar to how pcolor
() works but in 3D???)

is there a better way to visualise a set such as this?

any ideas?

manys thanks

"Sachitha Obeysekara" <sachitha.2.obeysekara@gsk.com> wrote in message
news:fa1tal$go5$1@fred.mathworks.com...
> Hi,
> I have 4 vectors x,y,z and i.
> x,y,z are coordinate values
> i is a representation of intensity
[snip]
> how can i plot this data onto a 3d graph so that the
> intensity is represented by a color? (similar to how pcolor
> () works but in 3D???)
> is there a better way to visualise a set such as this?

see SCATTER3

----------------------
% generate some data
x = rand(1,100);
y = rand(1,100);
z = rand(1,100);
i = rand(1,100)*200;

% specify the indexed color for each point
icolor = ceil((i/max(i))*256);

figure;
scatter3(x,y,z,i,icolor);
figure;
scatter3(x,y,z,i,icolor,'filled');
----------------------

--

Gautam Vallabha
The MathWorks
Email: Gautam.Vallabha@mathworks.com

Alternatively, you can visualise data using isosurfaces of
constand intensity; check out the isosurface function:

patch(isosurface(X,Y,Z,V,isovalue))