When I run this command I don't see anything until the value of a is nearly 0.5
Animate[ RegionPlot[ y^2 < a , {x, -5, 5}, {y, -5, 5}] , {a, 0.1, 0.5}]
Same situation with Manipulate.
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$\begingroup$ What happens when you give a step size? $\endgroup$– CA TrevillianJun 9, 2020 at 3:03
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1 Answer
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Building the RegionPlot is too slow. Use Region along with ImplicitRegion
Clear["Global`*"]
reg[a_] = ImplicitRegion[y^2 < a, {{x, -5, 5}, {y, -5, 5}}];
Animate[
Region[reg[a], Frame -> True, PlotRange -> {-5, 5}],
{a, 0.1, 0.5}]
answered Jun 9, 2020 at 3:14