How to plot this differential equation
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Hi guys, I hope you can help me to plot this differential equation:
Y = diff(X,tau); eq = (1-alpha)/(1 - gamma*(Y - Vdr)) + alpha + beta*(Y - Vdr)^2 == F
cond = [X(0) == 0, Y(0) == 0, Vdr == 2, alpha == 0.2, beta == 0, gamma == 3]; sol = dsolve (eq,cond)
Also Y = diff(X,tau) has to be less than Vdr.
I'm completely new using matlab, so I tried to write
fplot(@(tau)sol(tau), [-5 5], '-o')
But I only got a warning message: Function behaves unexpectedly on array inputs. To improve performance, properly vectorize your function to return an output with the same size and shape as the input arguments.
Thanks
回答（1 个）
Kim Winter
2018-7-3
0 个投票
Hi, You have "tau" as an input, but never initialize it before the @fplot. For example, if you try to run just line 1 (Y=diff(X,tau);), you will get the error that X is uninitialized (although tau is not either). If you initialize your inputs, you may have a better result!
-Kim
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