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用MMA画相曲线

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青青子衿 posted 2021-7-7 22:11 |Read mode
StreamPlot[{x - y, 2 x}, {x, -3, 3}, {y, -3, 3}]
ParametricPlot[
Evaluate[#[t] & /@
     DSolveValue[{x'[t] == x[t] - y[t], y'[t] == 2 x[t], x[0] == #1,
       y[0] == #2}, {x, y},
      t] & @@@ {{1, -1}, {3, -2}, {4, -3}}], {t, -10, 10},
PlotRange -> 10]
paultallen.fun/2013/01/30/mathematica-stream- … fferential-equations

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