How to plot 3D heat map in Matlab

Hi. I have (x,y,z) coordinates with measured values called (w) corresponding to these (x,y,z) coordinates. I want to produce a heat map for the measured value (w) in 3D. Is there anyway to do that.

[Adam Danz]

Use surf(X,Y,Z,C) where x and y are vectors or matrices and z and c are matrices (C is your variable, w).

[Kaushal Kishore]

Hi Thank you. In my case all x,y,z,w are vectors. how do i convert z and w to matrices.

[Cris LaPierre]

Do your x and y vectors contain repeating values? I.e. do they represent a grid of coordinate pairs, or a single line of points?

[Kaushal Kishore]

They represent grid of coordinate (x,y,z)

[Kaushal Kishore]

I am also attaching my sample data

[Adam Danz]

You could try a bubble chart if surf doesn't work out for you.

data = [
0	0	0.2	3
0.5	0	0.3	6
1	0	0.4	8
1.5	0	0.5	3
2	0	0.6	2
0	0.5	0.2	5
0.5	0.5	0.3	4
1	0.5	0.4	3
1.5	0.5	0.5	8
2	0.5	0.6	2
0	1	0.2	3
0.5	1	0.3	5
1	1	0.4	6
1.5	1	0.5	1
2	1	0.6	2
0	1.5	0.2	3
0.5	1.5	0.3	6
1	1.5	0.4	4
1.5	1.5	0.5	6
2	1.5	0.6	8
0	2	0.2	6
0.5	2	0.3	2
1	2	0.4	4
1.5	2	0.5	6
2	2	0.6	4];

bubblechart3(data(:,1),data(:,2),data(:,3),ones(size(data,1),1),data(:,4),'MarkerEdgeColor','none')

[Kaushal Kishore]

Thank you. It works

Answer 1

[Image Analyst]

There is not much heat to plot in that small data set. You might just visualize it with plot3() and make the markers somewhat large.

If you want to interpolate between the few discrete points, you can use scatteredInterpolant.

F = scatteredInterpolant(x,y,z,v) creates a 3-D interpolant of the form v = F(x,y,z).

I'm attaching a 2-D demo (not 3-D)