How can I make a contour map from a scatter plot?

I have a set of x-y coordinates of points (around 100,000 of them) and I want to make a contour map of their concentration in the x-y plane. In other words, closer contours in areas where there are a larger number of points. Does anyone have any suggestions on how I might go about this?

Answer 1

[Walter Roberson]

You could make a small adaptation of http://www.mathworks.com/matlabcentral/fileexchange/41185

[Sandy]

Perfect! Thanks!

[yaewon lee]

i cannot access the file anymore ...

[Walter Roberson]

Perhaps a modification of http://www.mathworks.com/matlabcentral/fileexchange/31726-data-density-plot