ArcGIS Reference

Parameters

data for SOM

The input data for the SOM. Need to determine the number of dimensions, and if using linear (lin) initialization the appropriate seed values.

topology type of map

The topology (geometry) of the self-organizing map. Hexagonal (hexa) has been preselected because the center points are all equidistant. Rectangular (rect) has a horizontal and vertical bias because diagonals are farther apart.

neighborhood type

The type of neighborhood or relationship between units in the SOM. Gaussian is selected by default, because it is most typical.

x dimension

The number of units of the SOM along the X axis.

y dimension

The number of units in the SOM along the Y axis.

initial SOM

The ouput file for the intial SOM.

initilization type

The initialization type to use for the some. Random (rand) has been selected, because it is more consistent with the method of self-organization, however linear (lin) will produce results more quickly.

random generator seed

The seed to use for the random number generator, by default the current time is used.

read buffer

The number of data lines to read at a time.

Code Reference

uiMapInit.mapinit(din, cout, topol, neigh, xdim, ydim, init, rand='#', buffer='#')

Creates a SOM codebook file using the specified parameters.

Note

This function makes system calls to SOM_PAK. SOM_PAK is limited to non-commercial use.

Arguments :

din The training data. cout The codebook to create. topol The topology of the SOM. This can be hexagonal (hexa) or rectagular (rect). neigh The neighborhood type. This can be bubble or Gaussian. xdim The number of units in the X-axis of the SOM. ydim The number of units in the Y-axis of the SOM. init The initation type. This can be random or linear. rand (optional) The random seed. This is the current time by default. buffer (optional) The size of the read buffer.

Usage :

>>>

See also

The Self-Organizing Map Program Package

Documentation for SOM_PAK.