som_neighborhood

som_neighborhood - SOM Toolbox Online documentation

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Unformatted text preview: SOM Toolbox Online documentation http://www.cis.hut.fi/projects/somtoolbox/ som_neighborhood Purpose Calculate to which neighborhood each map unit belongs to relative to each other map unit, given the units in 1-neighborhood of each unit. Syntax Ne = som_neighborhood(Ne1); Ne = som_neighborhood(Ne1,n); Description For each map unit, finds the minimum neighborhood to which it belongs to relative to each other map unit. Or, equivalently, for each map unit, finds which units form its k-neighborhood, where k goes from 0 to n. The neighborhood is calculated iteratively using the reflexivity of neighborhood. let N1i be the 1-neighborhood set a unit i and let N11i be the set of units in the 1-neighborhood of any unit j in N1i then N2i (the 2-neighborhood set of unit i) is N11i \ N1i Consider, for example, the case of a 5x5 map. The neighborhood in case of 'rect' and 'hexa' lattices (and 'sheet' shape) for the unit at the center of the map are depicted below: 'rect' lattice 'hexa' lattice--------------...
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som_neighborhood - SOM Toolbox Online documentation

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