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

Hi,

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!

Answer 1

[Alan Stevens]

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.

Answer 2

[Star Strider]

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);

figure

surf(X, Y, Z)

grid on

Also consider adding:

shading('interp')

if the grid points are too dense.

.

.

[Vittorio Bonino]

Thank you for the answer, but it creates a 3D surf and not a 2D:

I need to realize a sort of color map. The final result should appear like this:

[Star Strider]

After the surf call, add:

shading('interp')

view(0,90)

That should work.

.