 Usage:  plotdot(inX,inColorScheme {,inFactor})  
 
 Input:

  inX                    n x 1 Vector (continuous data) 
                         
  inColorScheme          m x 3 Vector of rgb colors for tonal highlighting 
                         
  inFactor               n x 1 Vector (discrete) specifying groups within inX 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
