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So I have very little experience in Mathematica but would like to learn how to plot. I have seen a few threads on this for $ 2\times 2$ systems but not for $ 3\times 3$ . So I’m trying to plot the phase portrait of the solution to the following equation: $ $ \begin{bmatrix}x_1\x_2\x_3\end{bmatrix}’=\begin{pmatrix}-2&1&0\1&-2&1\0&1&-2\end{pmatrix}\begin{bmatrix}x_1\x_2\x_3\end{bmatrix}$ $Read more