📄 vis_patch.html
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"><html><head><title>SOM Toolbox / vis_patch </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> vis_patch </H1><H3> Syntax </H3><UL><PRE> p = vis_patch(lattice)</PRE></UL><H3> Description </H3><PRE> Forms a map unit patch for SOM_CPLANE function. Mainly a subroutine of SOM_CPLANE, although can be used for on its own as well.</PRE><H3> Required input arguments </H3><PRE> lattice (string) 'hexa' produces vertex coordiantes for a hexagoanl patch which has its center on (0,0), unit width, and a height of 1.3334 units. This is not a regular hexagon but such that the node which has topological coordinates (a,b) has its center in the visualization at coordinates (a,b) for odd a and at (a,b+.5) for even a. The non-regular look of the patch is taken care simply by changing the axis ratio. 'rect' produces vertex coordinates for a uniform rectangular patch. having its center on (0,0) and unit sidelength. Used as a subfunction in SOM_CPLANE. 'hexagon' produces vertex coordinates for a regular hexagonal patch. It may be used in som_cplane if, for some reason, truly regular hexagons are needed instead of the default unit markers which are not uniform, but have integer y-coordinates in the lattice.</PRE><H3> Output arguments </H3><PRE> p (matrix) The 2-dimensional vertex coordinates: case 'rect' case 'hexa' case 'hexagon' p=[[-.5 -.5];... p=[[0 0.6667];... p=[[0 0.5774];... [-.5 .5];... [0.5 0.3333];... [0.5 0.2887];... [ .5 .5];... [0.5 -0.3333];... [0.5 -0.2887];... [ .5 -.5]]; [0 -0.6667];... [0 -0.5774];... [-0.5 -0.3333];... [-0.5 -0.2887];... [-0.5 0.3333]]; [-0.5 0.2887]]; </PRE><H3> Examples </H3><PRE> som_cplane(vis_patch('rect'),[6 5],'none'); % this produces the same result as som_cplane('rect',[6 5], 'none') som_cplane(vis_patch('hexa'), vis_unit_coord('hexa',[6 5]), 'none'); % produces in principle the same result as % som_cplane(vis_patch('hexa'),[6 5],'none'), % _but_ in this case the axis are not rescaled and the non-regular % shape of hexagons can be seen. som_cplane(vis_patch('hexagon'), som_unit_coords([6 5],'hexa'), 'none'); % produces a truly regular hexa lattice </PRE><H3> See also </H3><TABLE NOBORDER WIDTH=80%><TR><TD><a href="vis_unit_coord.html"><B>vis_unit_coord</B></a><TD> The default 'hexa' and 'rect' coordinates in visualizations<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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