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lang-mma
ParametricNDSolveValue. I usedpf = With[{tmax = 100}, ParametricNDSolveValue[{x'[t] == y[t], y'[t] == -9 Sin[x[t]] - 0.20 y[t], x[0] == a, y[0] == b}, {x[tmax], y[tmax]}, {t, 0, tmax}, {a, b}]]to simplify the first part of your code. $\endgroup$ParametricNDSolvestuff is neat, alas I only have v8 :) Was there any significant improvment in speed? $\endgroup$StreamPlot[{y, -0.5 y - Sin[x]}, {x, -3 \[Pi], 3 \[Pi]}, {y, -2, 2}, ....](changed insolas well), withtmax=500andPlotPoints -> 200, MaxRecursion -> 5, after waiting for a long time I got just a hexagonal-like box. Any ideas how to make it more flexible? $\endgroup$