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calculate weight of each 2D data point

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zheng on 10 Mar 2011
a data set consists of x and y, if I want to find out the associated weights for each point. What can I do?

Accepted Answer

Walter Roberson
Walter Roberson on 10 Mar 2011
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.

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