Find value of x, from max y (graph)
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figure(2);
vel = diff(y)./diff(x);
plot(x(1:end-1), vel)
display(max(findpeaks(vel)))
x(max(findpeaks(vel)));
Trying to find the value of x corresponding to the maximum value of y, for this velocity vs time graph.
displays error due to logical or integer access.
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Respuestas (2)
Mischa Kim
el 17 de Oct. de 2014
Andrew, check out
x = 0:0.1:6;
y = sin(x + 0.5);
vel = diff(y)./diff(x);
plot(x(1:end-1), vel,x(vel == max(vel)),max(vel),'dr')
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Michael Haderlein
el 17 de Oct. de 2014
Editada: Michael Haderlein
el 17 de Oct. de 2014
I'd actually prefer the following:
...
vel = diff(y)./diff(x);
[maxvel,ind]=max(vel);
plot(x(1:end-1),vel,x(ind),maxvel,'or')
If you have a large number of velocities, this one here will be faster. For a small number, it just doesn't matter.
5 comentarios
Michael Haderlein
el 17 de Oct. de 2014
What do you mean? You can, for instance, use the Data Cursor tool in the menu toolbar. Or you use the handles (plot_handles=get(gca,'children');) of the plots and then extract the x and the y data of the plots (x=get(plot_handles(1),'xdata');).
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