Description: Calculates the eigenvectors of the given matrix.
The eigenvectors are returned in columns and correspond to the eigenvalues
that can be calculated using the EigenValues function. In the resulting matrix column i is the eigenvector for the i-th eigenvalue.

The EigenVectors is a matrix or array formula and you need to press CTRL+SHIFT+ENTER to apply it.

A restriction is that the input matrix needs to be a symmetrix matrix.