 Usage:  z = strtok (str, del)  
 
 Input:

  str                    1 x 1 string vector 
                         
  del                    1 x 1 string vector 
                         
 Output:

  z                      n x 1 string vector, substrings of str 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
