calculate weight of each 2D data point

a data set consists of x and y, if I want to find out the associated weights for each point. What can I do?

Answer 1

[Walter Roberson]

Please expand on your question.

Are you trying to find out how many of the points fall in to each square of a grid? If so, then you can use accumarray for that:

xgrid = 1 + floor(Nx * (x - min(x)) ./ (max(x) - min(x)));
ygrid = 1 + floor(Ny * (y - min(y)) ./ (max(y) - min(y)));
weights = accumarray([xgrid(:), ygrid(:)], 1);

This will produce an Nx by Ny grid of counts.