How can I plot arrows over a function? (For ODE solution)
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Oscar Ramos Soto
on 14 Jun 2019
Answered: Star Strider
on 14 Jun 2019
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.
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Accepted Answer
Star Strider
on 14 Jun 2019
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:
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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