# Mesh Plot from Data Points

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Garrett Skinner on 18 Jan 2019
Answered: Naman Chaturvedi on 21 Jan 2019
I am trying to create a 3d mesh plot from data points. The plot i'm trying to create is dose rate in 3d space in a cylindrical coordinate system. I keep getting an error telling me that the size of the matrices are correct. Dose is a 220x35 matrix, r is broken down into 35 steps from 0 to 24, z is broke down into 11 steps from 0 to 24 and theta is from 0 to 1 with 20 steps.
Dose 220x35
r 220x35
z 220x11
theta 220x20
I tried the following:
surf(r,z,theta,dose)
colorbar

Naman Chaturvedi on 21 Jan 2019
Hi Garret,
To use surf(x,y,z), x, y and z should be matrices of the same size.Also, as you may know, the x, y and z are from the cartesian coordinate system. So, you would have to convert your cylindrical coordinates to cartesian coordinates.
>> surf(R.*cos(PHI), R.*sin(PHI), Z);
Also, go through the surf documentation: https://www.mathworks.com/help/matlab/ref/surf.html