How to plot a matrix in 3d?

I would like to plot a simple square matrix in a 3d plot, where in xlabel there is the index of rows or colums as well for the ylabel.

I would like to see the dots as values and not a surface.

Then can you also tell me how to view just one axis and the zaxis at the same time? the only option is to pan?

Answer 1

[Shubham]

Hey @Davide Cannavacciuolo,

I understand that you want to plot a square matrix in 3D while using the row and column indices as x and y-axis and values as z-axis. You also want to view only one axes (x-axis or y-axis) and z-axis at the same time.

You can refer to the following code snippet below:

% Example square matrix of random numbers 
A = randi(100,100);  
[n, ~] = size(A); 

% Create a grid of indices for the rows and columns 
[X, Y] = meshgrid(1:n, 1:n); 

% Flatten the matrices and plot 
x = X(:); 
y = Y(:); 
z = A(:); 

figure; 
plot3(x, y, z, '.'); 
xlabel('Row Index'); 
ylabel('Column Index'); 
zlabel('Value'); 
grid on; 

The above code plots the square matrix as desired. For viewing the plot on an x-z plane you can have look at the following code:

% Adjust the view to see only one axis and the z-axis 
% For example, to see the x-axis (row index) and the z-axis 
view(0, 0); % This sets the azimuth to 0 and the elevation to 0 

% Alternatively, to see the y-axis (column index) and the z-axis 
% view(90, 0);  
% This sets the azimuth to 90 and the elevation to 0 

I hope this helps!!