diagonalizing a matrix and putting eigenvectors in orde

I want to diagonal a matrix and ask MATLAB to put the smallest eigenvalue first and the corresponding eigenvector in first column of Unitary matrix. If I use eig the MATLAB does it automatically but if I use sym of my matrix and then diagonalizing the matrix, MATLAB puts the biggest one ( not the smallest eigenvalue and eigenvector), how can I do that? thanks

[Matt J]

Note: eig does not guarantee sorted eigenvalues.