MATLAB: How to plot color indication on the points in 2D and 3D

r2012a color 2d 3d

I have a set of data looks like this
X Y  Z  Intensity
-10  -10  15  100
-10  -10  16  200
-9  -10  15  150
-9  -10  16  130
-8  -10  15  110
-8  -10  16  117
-10  -9  15  210
-10  -9  16  189
-9  -9  15  234
-9  -9  16  156
-8  -9  15  175
-8  -9  16  183
-10  -8  15  216
-10  -8  16  260
-9  -8  15  144
-9  -8  16  190
-8  -8  15  128
-8  -8  16  219
The actual data file is much bigger. In the X-Y plane, I was trying to plot the color indication with the given Intensity for a fixed point in Z.
And is it possible that i cant plot a 3D view with the color indications using the current fields of data that I've.
I had tried to looked up on colormap, surf functions, but I don't know how to use them correctly.
Thanks

Best Answer

pointsize = 20;
scatter3(x(:), y(:), z(:), pointsize, intensity(:));
You can take subsets of the data for particular z, if you want. For example
idx = z == 16;   %watch out for floating point comparisons if the values are not integers!
scatter3(x(idx), y(idx), z(idx), pointsize, intensity(idx));
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