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37 lines
1010 B
37 lines
1010 B
3 months ago
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from manim import *
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class ArgMinExample(Scene):
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def construct(self):
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ax = Axes(
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x_range=[
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0, 10], y_range=[
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0, 100, 10], axis_config={
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"include_tip": False})
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labels = ax.get_axis_labels(x_label="x", y_label="f(x)")
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t = ValueTracker(0)
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def func(x):
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return 2 * (x - 5) ** 2
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graph = ax.plot(func, color=MAROON)
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initial_point = [
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ax.coords_to_point(
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t.get_value(), func(
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t.get_value()))]
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dot = Dot(point=initial_point)
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dot.add_updater(
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lambda x: x.move_to(
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ax.c2p(
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t.get_value(),
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func(
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t.get_value()))))
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x_space = np.linspace(*ax.x_range[:2], 200)
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minimum_index = func(x_space).argmin()
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self.add(ax, labels, graph, dot)
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self.play(t.animate.set_value(x_space[minimum_index]))
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self.wait()
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