How can I integral this equation and plot? please help me

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jameslk 2021-6-16

评论： jameslk 2021-6-16

dy/dt = y*t^2 + 3*y

y(0) = 1

t= 0:2

This is the equation which I want to integral

But when I integrate and plot this how can I get dy/dt. Because dy/dt becomes y when i intergrate it.

John D'Errico 2021-6-16

You want to plot the derivative?

Surely it would be true, that if you know y(t), and t, then you can compute dy/dt, since you have the expression right there.

jameslk 2021-6-16

yes i want to plot that equation after integral

and how can i get integral constant?

I don't have idea to do this with function int or integral

Walter Roberson 2021-6-16

syms y(t) c

eqn = diff(y) == y*t^2 + 3*y

eqn(t) =

ic = y(0) == 1

ic =

sol = dsolve([eqn, ic])

sol =

fplot(sol, [0 2])

jameslk 2021-6-16

thank you so much :)

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