Plot 2D surf from 3 columns (X, Y, Data)

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Vittorio Bonino
Vittorio Bonino on 29 Jul 2022
Commented: Star Strider on 29 Jul 2022
I have data disposed in the following way:
The first column rapresents the x coordinates, the second column rapresents the y coordinates and the 3rd column contains the data value at the (x, y) coords.
I can't use the function surf since it required that the 3rd column in disposed as a matrix where every index represents the coorinate.
So I'm looking for a way to convert my 3 columns in a matrix with my data, or plot directly the surface using a function that accepts that format.
Thank you!

Answers (2)

Alan Stevens
Alan Stevens on 29 Jul 2022
Edited: Alan Stevens on 29 Jul 2022
plot3 will plot your points as a line (or series of points).
To get a surface, set up regular coordinates over the appropriate range for cp12x and cp12y, then use meshgrid to get a matrix, then interp2 to interpolate to find appropriate values of your magnetic field at those mesh points.
Then use surf.

Star Strider
Star Strider on 29 Jul 2022
Edited: Star Strider on 29 Jul 2022
Try something like this —
Tmag = readtable('FileName', 'VariableNamingRule','preserve');
x = Tmag{:,1};
y = Tmag{:,2};
z = Tmag{:,3};
L = size(Tmag,1);
xv = linspace(min(x), max(x), L);
yv = linspace(min(y), max(y), L);
[X,Y] = ndgrid(xv, yv);
Z = griddata(x, y, z, X, Y);
surf(X, Y, Z)
grid on
Also consider adding:
if the grid points are too dense.
Star Strider
Star Strider on 29 Jul 2022
After the surf call, add:
That should work.

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