411 REFERENCE · Wikibooks
Linear Algebra and the C Language/a0nz
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invA = EVector invEValue EVectorT
Copy/Paste into the octave window
% Matrix 2x2 -------------
clear, clc
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
Copy/Paste into the octave window
% Matrix 3x3 ---------------------
clear, clc
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
%%