📄 som_unit_coords.html
字号:
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"><html><head><title>SOM Toolbox / som_unit_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_unit_coords </H1><H3> Purpose </H3><PRE> Returns map grid coordinates for the units of a Self-Organizing Map.</PRE><H3> Syntax </H3><UL><PRE> Co = som_unit_coords(sTopol); Co = som_unit_coords(sM.topol); Co = som_unit_coords(msize); Co = som_unit_coords(msize,'hexa'); Co = som_unit_coords(msize,'rect','toroid');</PRE></UL><H3> Description </H3><PRE> Calculates the map grid coordinates of the units of a SOM based on the given topology. The coordinates are such that they can be used to position map units in space. In case of 'sheet' shape they can be (and are) used to measure interunit distances. NOTE: for 'hexa' lattice, the x-coordinates of every other row are shifted by +0.5, and the y-coordinates are multiplied by sqrt(0.75). This is done to make distances of a unit to all its six neighbors equal. It is not possible to use 'hexa' lattice with higher than 2-dimensional map grids. 'cyl' and 'toroid' shapes: the coordinates are initially determined as in case of 'sheet' shape, but are then bended around the x- or the x- and then y-axes to get the desired shape. </PRE><H3> Possible bugs </H3><PRE> I don't know if the bending operation works ok for high-dimensional map grids. Anyway, if anyone wants to make a 4-dimensional toroid map, (s)he deserves it.</PRE><H3> Required input arguments </H3><PRE> topol Map grid dimensions. (struct) topology struct or map struct, the topology (msize, lattice, shape) of the map is taken from the appropriate fields (see e.g. SOM_SET) (vector) the vector which gives the size of the map grid (msize-field of the topology struct).</PRE><H3> Optional input arguments </H3><PRE> lattice (string) The map lattice, either 'rect' or 'hexa'. Default is 'rect'. 'hexa' can only be used with 1- or 2-dimensional map grids. shape (string) The map shape, either 'sheet', 'cyl' or 'toroid'. Default is 'sheet'. </PRE><H3> Output arguments </H3><PRE> Co (matrix) coordinates for each map units, size is [munits k] where k is 2, or more if the map grid is higher dimensional or the shape is 'cyl' or 'toroid'</PRE><H3> Examples </H3><PRE> Simplest case: Co = som_unit_coords(sTopol); Co = som_unit_coords(sMap.topol); Co = som_unit_coords(msize); Co = som_unit_coords([10 10]); If topology is given as vector, lattice is 'rect' and shape is 'sheet' by default. To change these, you can use the optional arguments: Co = som_unit_coords(msize, 'hexa', 'toroid'); The coordinates can also be calculated for high-dimensional grids: Co = som_unit_coords([4 4 4 4 4 4]);</PRE><H3> See also </H3><TABLE NOBORDER WIDTH=80%><TR><TD><a href="som_unit_dists.html"><B>som_unit_dists</B></a><TD> Calculate interunit distance along the map grid.<TR><TD><a href="som_unit_neighs.html"><B>som_unit_neighs</B></a><TD> Calculate neighborhoods of map units.</TABLE><p><hr><br><br><!-- Last updated: May 30 2002 --></body></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -