 Usage:  ann (x, y, t {, vn})  
 
 Input:

  x                      n x p matrix input variables 
                         
  y                      n x q matrix output variables 
                         
  t                      n x 1 vector of sets (0=training, 1=test, 2=validation) 
                         
  vn                     p x 1 vector of variable names (unused) 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
