 Usage:  z = ludecomp (x)  
 
 Input:

  x                      square matrix 
                         
 Output:

  z.l                    containing the lower matrix 
                         
  z.u                    containing the upper matrix 
                         
  z.index                containing an indexvector 
                         
  index                  containing the square matrix x 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
