Mathematica Asked by Ruth Lazkoz on July 26, 2021
I have this code that does not even work for a single condition, say
s = NDSolve[{x'[t] == -y[t] - 0.5 x[t]^2, y'[t] == x[t] - y[t]^3,
x[0] == 0.7, y[0] == 0.2,
WhenEvent[
x[t]^2 + y[t]^2 < 0.2, {tMax = t, "StopIntegration"}]}, {x,
y}, {t, 300}];
ParametricPlot[Evaluate[{x[t], y[t]} /. s], {t, 0., 30.}]
and I want to go even further and include an additional condition like this
s = NDSolve[{x'[t] == -y[t] - 0.5 x[t]^2, y'[t] == x[t] - y[t]^3,
x[0] == 0.7, y[0] == 0.2,
WhenEvent[
x[t]^2 + y[t]^2 < 0.7|| x[t]<1., {tMax = t, "StopIntegration"}]}, {x,
y}, {t, 300}]
Any suggestions?
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