📄 som_vis_coords.html
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"><html><head><title>SOM Toolbox / som_vis_coords </title></head><body bgcolor=#f0f0f0><table border=0 width="100%" cellpadding=0 cellspacing=0><tr><td valign=baseline><font size=+2>SOM Toolbox</font></td><td valign=baseline align=center><a href="somtoolbox.html">Online documentation</td><td valign=baseline align=right><a href="http://www.cis.hut.fi/projects/somtoolbox/" target="_top">http://www.cis.hut.fi/projects/somtoolbox/</a></td></tr></table><hr><H1> som_vis_coords </H1><H3> Syntax </H3><UL><PRE> Co = som_vis_coords(lattice, msize)</PRE></UL><H3> Description </H3><PRE> This function calculates the coordinates of map units in 'hexa' and 'rect' lattices in 'sheet' shaped map for visualization purposes. It differs from SOM_UNIT_COORDS in the sense that hexagonal lattice is calculated in a "wrong" way in order to get integer coordinates for the units. Another difference is that it may be used to calculate the coordinates of units _and_ the center points of the lines connecting them (edges) by using 'hexaU' or 'rectU' for lattice. This property may be used for drawing u-matrices. The unit number 1 is set to (ij) coordinates (1,1)+shift 2 (2,1)+shift ... columnwise n-1th (n1-1,n2)+shift nth (n1,n2)+shift where grid size = [n1 n2] and shift is zero, except for the even lines of 'hexa' lattice, for which it is +0.5. For 'rectU' and 'hexaU' the unit coordinates are the same and the coordinates for connections are set according to these. In this case the ordering of the coordinates is the following: let U = som_umat(sMap); U=U(:); % make U a column vector Uc = som_vis_coords(sMap.topol.lattice, sMap.topol.msize); now the kth row of matrix Uc, i.e. Uc(k,:), contains the coordinates for value U(k). </PRE><H3> Required input arguments </H3><PRE> lattice (string) The local topology of the units: 'hexa', 'rect', 'hexaU' or 'rectU' msize (vector) size 1x2, defining the map grid size. Notice that only 2-dimensional grids are allowed.</PRE><H3> Output arguments </H3><PRE> Co (matrix) size Mx2, giving the coordinates for each unit. M=prod(msize) for 'hexa' and 'rect', and M=(2*msize(1)-1)*(2*msize(2)-1) for 'hexaU' and 'rectU'</PRE><H3> Features </H3><PRE> Only 'sheet' shaped maps are considered. If coordinates for 'toroid' or 'cyl' topologies are required, you must use SOM_UNIT_COORDS instead.</PRE><H3> Examples </H3><PRE> Though this is mainly a subroutine for visualizations it may be used, e.g., in the following manner: % This makes a hexagonal lattice, where the units are rectangular % instead of hexagons. som_cplane('rect',som_vis_coords('hexa',[10 7]),'none'); % Let's make a map and calculate a u-matrix: sM=som_make(data,'msize',[10 7],'lattice','hexa'); u=som_umat(sM); u=u(:); % Now, these produce equivalent results: som_cplane('hexaU',[10 7],u); som_cplane(vis_patch('hexa')/2,som_vis_coords('hexaU',[10 7]),u);</PRE><H3> See also </H3><TABLE NOBORDER WIDTH=80%><TR><TD><a href="som_grid.html"><B>som_grid</B></a><TD> Visualization of a SOM grid<TR><TD><a href="som_cplane.html"><B>som_cplane</B></a><TD> Visualize a 2D component plane, u-matrix or color plane<TR><TD><a href="som_barplane.html"><B>som_barplane</B></a><TD> Visualize the map prototype vectors as bar diagrams<TR><TD><a href="som_plotplane.html"><B>som_plotplane</B></a><TD> Visualize the map prototype vectors as line graphs<TR><TD><a href="som_pieplane.html"><B>som_pieplane</B></a><TD> Visualize the map prototype vectors as pie charts<TR><TD><a href="som_unit_coords.html"><B>som_unit_coords</B></a><TD> Locations of units on the SOM grid</TABLE><p><hr><br><br><!-- Last updated: May 30 2002 --></body></html>⌨️ 快捷键说明
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