question about fplot function

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kris Holm
kris Holm 2021-1-4
评论： kris Holm 2021-1-4
hey! i have a question about fplot.
I am stuck with this problem since many hours. I solve a differential equation but i have to plot it but it dosent work. can someone please help me what im doing wrong?
my code looks like this.
syms f(x)
Dy = diff(y,x,1);
DDy = diff(y,x,2);
ysol = dsolve(DDy + 3*Dy == 12*x - 5, y(0) == 1,Dy(0) == 0)
fplot(f(x))
xlim([-2 10])

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回答（1 个）

Mischa Kim
Mischa Kim 2021-1-4
Hi Kris,
syms y(x)
Dy = diff(y,x,1);
DDy = diff(y,x,2);
ysol = dsolve(DDy + 3*Dy == 12*x - 5, y(0) == 1,Dy(0) == 0)
fplot(ysol)
xlim([-2 10])

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