How can I plot arrows over a function? (For ODE solution)

2019 6 14
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更新时间：2019 6 14
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Hi! I want to plot arrows over a function , for example if I have a Sin(x) function, plot the arrows and its directions.
Maybe I'm not clear, so I'll let an example down here.
I've tried using quiver() but I cant get the results as the image below.
Thanks a lot.Captura de pantalla (843).png

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Star Strider
Star Strider 2019-6-14

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Try this:
t = linspace(0, 2, 25);
h = t(2)-t(1);
s = sin(2*pi*t/max(t));
ds = gradient(s,h);
dt = gradient(t,h);
figure
quiver(t,s, dt,ds)
grid
producing:
How can I plot arrows over a function (For ODE solution) - 2019 06 13.png
This calculates the derivative from the data (here sin(t)). You may be able to recover your derivative directly from your ODE, so you may not need to calculate the gradient of your solved vector. I will leave that for you to determine.

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