Mathc matrices/03v

invA = EVector invEValue EVectorT

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% Matrix 2x2 -------------

A = round(15*randn(2));    %% A matrix 2x2
A = A'*A                   %% A symetric matrix

% Eigenvalues Eigenvectors
[Evectors,Evalues] = eigs(A);

invEvalues = inv(Evalues);

invA = Evectors * invEvalues * Evectors'

invAA = invA*A
%%

invB= EVector invEValue EVectorT

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% Matrix 3x3 ---------------------

B = round(15*randn(3));      %% A matrix 3x3
B = B'*B                     %% A symetric matrix

% Eigenvalues Eigenvectors
[Evectors,Evalues] = eigs(B);

invEvalues = inv(Evalues);

invB = Evectors * invEvalues * Evectors'

invBB = invB*B
%%