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You are right. I just misused the functions. Now it works: Xb = Transpose[Eigenvectors[A]] Db = DiagonalMatrix[Eigenvalues[A]] And Xb.Db.Inverse[Xb] returns A as it should be. Thank you!
It works. Thank you very much!
Yes, I do. This is what I originally want. Thank you very much, my friend!