3623.sagews

load(DATA+'phase_plot.sage')

A = Matrix([[-2,3],[-18,4]]); A

[ -2 3] [-18 4]

A.eigenvalues()

[1 - 6.708203932499369?*I, 1 + 6.708203932499369?*I]

T_matrix(eigenvectors(A)[1])

[ 1 0] [ 1 sqrt(5)]

graphX(A)
graphY(A)

complex

complex