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Hi all I am a physicist and a new user of Sage. I used the following command on "Sage Version 5.1, Release Date: 2012-07-09", to get the expression of eigenvalue and eigenvectors of the symmetric real 3x3 matrix.

var('g11,g12,g13,g22,g23,g33',domain='real')
gamma=matrix(3,3,[g11,g12,g13,g12,g22,g23,g13,g23,g33])
eigs=gamma.eigenvectors_right()

It seems that this type of expression is unavailable, as it took forever to calculate on my laptop (Intel core i7) . So I would like to ask if I used the wrong command or mathematically the analytical expression is unavailable. Thanks very much.