 Usage:  {ur, v} = chview (usel, oldv)  
 
 Input:

  usel                   vector commands 
                         
  oldv                   scalar old view 
                         
 Output:

  ur                     vector commands 
                         
  v                      scalar new view 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
