[R] real eigenvectors

[Stephane DRAY]

Hello list,

Sorry, these questions are not directly linked to R.

If I consider an indefinte real matrix, I would like to know if the 
symmetry of the matrix is sufficient to say that their eigenvectors are real ?
And what is the conditions to ensure that eigenvectors are real in the case 
of an asymmetric matrix (if some conditions exist)?

Thanks in Advance,
Stéphane DRAY
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