 Usage:  kuva (cs {, stri})  
 
 Input:

  cs                     list of vectors: data structure which represents a binary tree 
                         and is produced by cartsplit procedure, contains vectors .. 
                         cs.val, cs.vec, cs.mean, cs.ssr, cs.nelem. 
                         See cartsplit for the description of cs. 
                         
  stri                   string: optional argument, 
                         either missing, "nelem", "ssr" or "mean". 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
