 Usage:  {dK, cK, mK} = canbw(K)  
 
 Input:

  K1                     string, kernel function on [-1,1] or "gau". 
                         
 Output:

  dK                     canonical bandwidth for K. 
                         
  cK                     squared L2 mnorm of K. 
                         
  mK                     second moment of K. 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
