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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"><html><head><title>SOM Toolbox / som_write_data </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_write_data </H1><H3> Purpose </H3><PRE> Writes data structs/matrices to a file in SOM_PAK format.</PRE><H3> Syntax </H3><UL><PRE> som_write_data(sD,'filename') som_write_data(D,'filename') som_write_data(...,'missing')</PRE></UL><H3> Description </H3><PRE> This function is offered for compatibility with SOM_PAK, a SOM software package in C. It writes data structs/matrices to a file in SOM_PAK format. See SOM_READ_DATA for a decription of the SOM_PAK data file format. Since the format does not support information on normalizations, that information is lost, as well as the data name. The component names are written on a comment line which begins with '#n' and label names on comment line which begins with '#l', respectively. Any spaces (' ') in the component names and in the label names are replaced with underscores ('_'). This function is only offered for compatibility with SOM_PAK. In general, when saving data in files, use 'save filename.mat sData'. This is faster and retains all information of the data struct. The string to use for missing values (NaNs) in the written file can be given with the last argument. Notice that if you use SOM_PAK to read the files, you need to set the SOM_PAK environment variable LVQSOM_MASK_STR accordingly, e.g. to 'NaN' if you use the default replacement. For more information, see the SOM_PAK instructions.</PRE><H3> Required input arguments </H3><PRE> data (struct or matrix) data to be written filename (string) output filename</PRE><H3> Optional input arguments </H3><PRE> missing (string) string used to denote missing components (NaNs); default is 'NaN'</PRE><H3> Examples </H3><PRE> The basic usage is: som_write_data(sData,'system.data') To write a data matrix to a file in plain SOM_PAK format, give a data matrix as the first argument: som_write_data(D,'system.data') By default, all NaNs in the data matrix are written as 'NaN':s. The third argument can be used to change this: som_write_data(sData,'system.data','+') som_write_data(sData,'system.data','missing')</PRE><H3> See also </H3><TABLE NOBORDER WIDTH=80%><TR><TD><a href="som_read_data.html"><B>som_read_data</B></a><TD> Reads data from an ascii file.<TR><TD><a href="som_read_cod.html"><B>som_read_cod</B></a><TD> Read a map from a file in SOM_PAK format.<TR><TD><a href="som_write_cod.html"><B>som_write_cod</B></a><TD> Writes data struct into a file in SOM_PAK format.</TABLE><p><hr><br><br><!-- Last updated: May 30 2002 --></body></html>⌨️ 快捷键说明
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