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How can I find a section of a graph?

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wobbly
wobbly 2021-9-8
回答： Chunru 2021-9-9
I want to highlight a percentage of the maximum amplitude along the wave. What function will allow me to do this?

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Chunru
Chunru 2021-9-9
Ran in:
% plot the curve
t = 0:.1:5;
x = cos(2*pi*3*(t-2.5))./(1+(t-2.5).^2*2);
plot(t, x, 'b-');
% peak around 2.4-2.6
idx = find(t>2.4 & t<2.6);
hold on
plot(t(idx), x(idx), 'y-', 'LineWidth', 2)

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