I need to calculate eigen values and eigen vectors of a large symmetric real matrix, but all eigen vectors have to be exact not just 2/3 off all eigenvectors.(adsbygoogle = window.adsbygoogle || []).push({});

I tried with CPPLAPACK and dgeev routine:

http://cpplapack.sourceforge.net/

but only about 2/3 of eigen values and vectors are exact, for my project I need all vectory exactly calculated with the norm of unity, for the time expansion of my system in eigen space. I use MKL and ICC compiler, how can I calculate numerically all eigen vectors exactly in c++, which method would be exact.

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# Eigen values/vectors large symetric matrix

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