search for: 30x30x30

...three dimensions? b) if not, my skills only seem to extend as far as writing a function which measures density as the number of data points falling within a sphere at each point on a 3D grid. The results for spheres of the minimum size to cover all the space (i.e. slightly intersecting) on a 30x30x30 mesh don't seem too bad. i) How inadequate is such an analysis likely to be for subsequent comparison of different density distributions? ii) Is there anything equally simple I could implement which might be preferable? Any help much appreciated, Chris -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~...