MATLAB: How to display a vector as colorplot of to other vectors

plottingvectors

Hi, I couldn't figure that one out myself, so hopefully somebody has a solution.

I have three vectors X, Y, and Z of same dimension, so that Z(k) is a height for horizontal coordinates (X(k),Y(k)). I want to display Z as a color plot over the horizontal area that encompasses all coordinate pairs of X and Y. All functions I know (pcolor, surf, etc) require Z to be a matrix which is not really feasible due to memory problems since the vectors are quite large (appr. 250000 elements). Also, the horizontal coordinates are not on a regular grid but more like a point cloud.

Any idea how to display the data as it is would be appreciated.

Cheers, Peter

Best Answer

If you have a point cloud, the scatter3 or plot3 functions would work. There are a number of options for coloring the points.

If you want to grid them at some point, see if scatteredInterpolant will do what you want.

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You can use this code:

xyz = [-8.67212090030965	-7.78294481282592	4.19809966191787
4.30363429770975	-6.33796132936349	2.30412196271579
11.4626419696253	3.31049523749869	2.84193335035400
1.28757516363600	6.20802478748340	11.1358580308193]
x1 = xyz(:, 1);
y1 = xyz(:, 2);
z1 = xyz(:, 3); 
SizeXYZ = size(xyz,1);
for i = 1:SizeXYZ
  [x,y,z] = createspheres(x1(i),y1(i),z1(i));
  surf(x,y,z);
  hold on
end
%
function [X,Y,Z] =createspheres(spherex, spherey, spherez)
[x, y, z] = sphere(20);
X= x+ spherex;
Y = y+ spherey;
Z = z+spherez;
%newroot
end

Best Answer

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