how to only plot a certain area of an existing plot

Hi, so i have this figure which is produced from my code (attached). I would like to reproduce the plot but for it to be masked within a circle and for the data points to only be plotted within this circle. The circle is to have a radius of 0.045m and the centre is to be located at (0,0). I have also attached an image of what kind of thing I am after.

Thank you in advance! I have attached my code.

n = 250;                           % number of points on the voronoi diagram
L2x = zeros(1,n);                  % array to store the L2 x values 
L2y = zeros(1,n);                  % array to store the L2 y values

for i=1:n
    q = randi([-50 50],1,1);       %Parameters for the random case
    L2x(i) = q.*1e-3  ;            %limit that L2 must be greater than 0.5mm is obeyed 
 
    w = randi([-50 50],1,1);
    L2y(i) = w.*1e-3;

    P = [L2x(:) L2y(:)];           %extracting the x and y values and placing it into one matrix
end

figure
voronoi(P(:,1),P(:,2))    % Plotting the voronoi diagram
[V,C] = voronoin(P);      % storing the voroni vertexs' in V
V(isinf(V)) = 1;          % replacing the inf values in the array to 1

for i=1:length(C)        %finding the centroids for each cell
    Cnew = V(C{i},:);
    [xnew,ynew] = centroid(polyshape(Cnew(:,1),Cnew(:,2)));
%     m = (x)
    hold on
    plot(xnew,ynew,'r+')
    axis ([-0.050 0.050 -0.050 0.050])
    hold off
end

Answer 1

[Sam Chak]

Hi @rman

Generally, this imcrop() command is used to crop image, but it can only crop rectangular shape.

To crop a circular shape out of the image, you need some tricks.

Follow the procedure as detailed by out community's best @Image Analyst. (no pun intended).

https://www.mathworks.com/matlabcentral/answers/567441-how-to-crop-circle-from-an-image

[rman]

Im afraid this isnt exactly what im after. I am not after saving the image and cropping the image. Im trying to produce the first plot but write a script that only plots the points within the circle and then doesnt plot anything which is not inside it.