Plotting 3D mesh from 3 data columns

I have an excel file with 3 colums (X,Y and Z coordiantes) which i would like to plot as a surface (heat map) in 3D. Preferably I would like my x and y axis to be shown with the following lengths: x = 0 - 11.5 and y = 0 - 7.6

Answer 1

[Sakshay]

Hi Bendix,

As per my understanding, you are trying to create a 3D surface plot from X,Y,Z points.

You need to interpolate the points to plot them as a surface. The points can be interpolated using the "griddata()" function. The following example will illustrates how to do that:

% Read the data points as a matrix
T = readmatrix('3DPlot.xlsx');

% Create a meshgrid for plotting
[xq,yq] = meshgrid(0:.2:11.5, 0:.2:7.6);

% Interpolate the points using griddata function
vq = griddata(t(:, 1), t(:, 2), t(:, 3),xq,yq);

% Plot the surface
mesh(xq,yq,vq);
hold on;

% Plot the points
plot3(t(:, 1), t(:, 2), t(:, 3),'o');

% Set the X and Y Limits
xlim([0 11.5]);
ylim([0 7.6]);

Please refer to the following documentation for more information on "griddata()" function:

https://www.mathworks.com/help/matlab/ref/griddata.html

[Bendix]

Perfect, thank you very much and thanks for the explanations of the lines! Just a small correction, the first varable should be lower case t and it works like a charm