📄 som_denormalize.html

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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"><html><head><title>SOM Toolbox / som_denormalize </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_denormalize </H1><H3> Purpose </H3><PRE> Undo normalizations of data structs/sets.</PRE><H3> Syntax </H3><UL><PRE>  sS = som_denormalize(sS)  sS = som_denormalize(...,'argID',value,...);  sS = som_denormalize(...,value,...);   D = som_denormalize(D,sNorm)</PRE></UL><H3> Description </H3><PRE> This function is used to undo normalizations of data structs/sets. If a data/map struct is given, all normalizations in the '.comp_norm' field are undone and, thus, the values in the original data context are returned. If a matrix is given, the normalizations to undo must be given as the second argument. SOM_DENORMALIZE actually uses function SOM_NORM_VARIABLE to handle the normalization operations, and only handles the data struct/set specific stuff itself. Normalizations are always one-variable operations. In the data and map structs the normalization information for each component is saved in the '.comp_norm' field, which is a cell array of length dim. Each cell contains normalizations for one vector component in a struct array of normalization structs. Each component may have different amounts of different kinds of normalizations. Typically, all normalizations are either 'undone' or 'done', but in special situations this may not be the case. The easiest way to check out the status of the normalizations is to use function SOM_INFO, e.g. som_info(sS,3)</PRE><H3> Required input arguments </H3><PRE>   sS                The data to which the denormalization is applied.            (struct) Data or map struct. The normalizations in the                      '.comp_norm' field are undone for the specified                      components.            (matrix) Data matrix. The normalization to undo must be                     given in the second argument.</PRE><H3> Optional input arguments </H3><PRE>  argID (string) Argument identifier string (see below).  value (varies) Value for the argument (see below).  The optional arguments can be given as 'argID',value -pairs. If an  argument is given value multiple times, the last one is used. The  valid IDs and corresponding values are listed below. The values  which are unambiguous (marked with '*') can be given without the  preceeding argID.   sNorm    *(struct) Normalization struct, or an array of structs, which                      is undone for all specified components. If the                       '.status' field of the struct(s) is 'uninit',                       the undoing operation is interrupted - it cannot be                       done. Alternatively, the struct may be map or                       data struct in which case its '.comp_norm' field                       is used (see the cell array option below).            *(cell array) In practice, the '.comp_norm' field of                       a data/map struct. The length of the array                       must be equal to the dimension of the given                       data set (sS). Each cell contains the                      normalization(s) for one component. Only the                       normalizations listed in comps argument are                      undone though.   'remove' *(string) If 'remove' tag is specified, the                      normalization operations are not only undone,                       they are also removed from the struct.   'comps'  *(vector) The components which are denormalized.                      Default is to undo all components.            *(string) 'all'</PRE><H3> Output arguments </H3><PRE>   sS                Modified and/or updated data.            (struct) If a struct was given as input argument, the                     same struct is returned with denormalized data and                     updated '.comp_norm' fields.             (matrix) If a matrix was given as input argument, the                      denormalized data matrix is returned.</PRE><H3> Examples </H3><PRE>  To undo normalization of a data/map struct:     sD = som_denormalize(sD);     sM = som_denormalize(sM);   To completely remove the normalizations, use the 'remove' tag:     sD = som_denormalize(sD,'remove');  To undo only a few selected components, use the comps argument:     sD = som_denormalize(sD,[1 3:5]);   To denormalize a set of values from a data set D (which must be   of equal dimension as the data in sD):     D = som_denormalize(D,sD);   or     D = som_denormalize(D,sD.comp_norm);   only denormalize a few components    D = som_denormalize(D,sD,[1 3:5]);   Assuming you have a few values of a certain vector component (i)  in a vector (x) which you want to denormalize:     xorig = som_denormalize(x,sD.comp_norm{i});   or using SOM_NORM_VARIABLE    xorig = som_norm_variable(x,sD.comp_norm{i},'undo');  To check out the status of normalization in a struct use SOM_INFO:     som_info(sM,3)    som_info(sD,3)</PRE><H3> See also </H3><TABLE NOBORDER WIDTH=80%><TR><TD><a href="som_normalize.html"><B>som_normalize</B></a><TD> Add/apply/redo normalizations of a data struct/set.<TR><TD><a href="som_norm_variable.html"><B>som_norm_variable</B></a><TD> Normalization operations for a set of scalar values.<TR><TD><a href="som_info.html"><B>som_info</B></a><TD> User-friendly information of SOM Toolbox structs.</TABLE><p><hr><br><br><!-- Last updated: May 30 2002 --></body></html>
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