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Dears, If Xb=c, and X= the coefficient matrix b= an unknown vector, c= known vector then b=inverse of X * c now if in the above equation, c and b were known vectors, and X was an symetric unkown coefficent matrix, when it is possible to obtain matrix X or a function of X from b and c? Regards, Rohullah __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com