Dear all: Following the example 06, alas444.fc has been got. Would somebody give me some explaination about this file? And customarily, the IFC matrix is [ K11 K12 K13 ... K1N ] [ K21 K22 K23 ... K2N ] [ .... ... ] [ KN1 KN2 KN3 ...KNN] How to transform this IFC in this file to the above form? Best wishes, lijin