 Usage:  x = invfwt (a, b, n, l, h)  
 
 Input:

  a                      l x 2 matrix, indices and coefficients of father wavelet 
                         
  b                      (n-l) x 3 matrix, indices and coefficients of mother wavelet 
                         
  n                      integer, total amount of coefficients, has to be a power of 2 
                         
  l                      integer, the number of coeffients of the mother wavelets 
                         
  h                      m x 1 vector, wavelet basis 
                         
 Output:

  x                      n x 1 vector, 
                         
--------------------------------------------------------------
(C) MD*TECH Method and Data Technologies, 17.8.2000
