 Usage:  h2 = canker (h1, K1, K2)  
 
 Input:

  h1                     array, bandwidth for K1. 
                         
  K1                     string, kernel function on [-1,1] or "gau". 
                         
  K2                     string, kernel function on [-1,1] or "gau". 
                         
 Output:

  h2                     array, equivalent bandwidth for K2. 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
