 Usage:  {xc,xcvars}=categorize(x {,reftype,refvalue} {,xvars})  
 
 Input:

  x                      n x p matrix, the columns correspond to the 
                         variables. 
                         
  reftype                optional, either "value" when reference 
                         values shall be given or "index" when indices of 
                         reference values shall be given. 
                         
  refvalue               optional, p x 1 vector, reference values or indices 
                         of reference values. If it is impossible to use 
                         one of these values, the corresponding 
                         variable is not categorized. 
                         
  xvars                  optional, p x 1 string vector, variable names. 
                         
 Output:

  xc                     n x pc matrix, the categorized data. 
                         
  xcvars                 pc x 1 string vector, variable names of 
                         categorized data, where the numbers of categories 
                         are preceeded by "#". 
                         If xvars was not given, the variable names for x 
                         are set as "Variable 1", "Variable 2" etc. 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
