MATLAB: How to create a matrix of values from a X and Y coordinates

MATLABmatrix arraymatrix manipulation

Hi
I have a vector u (dots) with its x,y coordinates. Each vector has the same size. I wanto to create a matrix u using x,y coordinates. How I can do it, taking into account that x and y don't form a perfect rectangle.? I mean, there are empty values of u without their coordiantes x,y respectively as you can see in the figure. Empty values can be filled by NaN.
dots.jpg

Best Answer

Thank you everyone for you help.
I all ready solve using the following code.
d = [2.0000         0    0.3800;
     2.0000    5.0000    0.3480;
     2.0000   25.0000    0.3280;
     3.0000    2.0000    0.3190;
     3.0000   50.0000    0.2120;
     5.0000   10.0000    0.1380;
     5.0000   60.0000    0.1100;
     5.0000  100.0000    0.0870;
     7.0000    5.0000    0.0690;
     7.0000    9.0000    0.4113;
     7.0000   45.0000    0.3807;
     7.0000   95.0000    0.3678;
     9.0000   10.0000    0.3207;
     9.0000   35.0000    0.1765;
    15.0000   65.0000    0.1123;
    15.0000   75.0000    0.0917;
    15.0000   99.0000    0.0727;
    15.0000  125.0000    0.0573;
    15.0000  150.0000    0.3811];
X = d(:,1); Y = d(:,2); Z = d(:,3);
Xs = unique(X);
Ys = unique(Y);
Xi = arrayfun( @(x) find(Xs==x), X );
Yi = arrayfun( @(y) find(Ys==y), Y );
Li = Yi + (Xi-1) * numel(Ys);
XYZ = nan(numel(Ys), numel(Xs));
XYZ( Li ) = Z;
I found it in this link: https://www.mathworks.com/matlabcentral/answers/38731-how-to-create-a-regular-data-matrix-from-irregularly-sampled-xyz-data-with-different-x-and-y-coordin
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