How to get a plot?

v=dsolve('D2v=-2*Dv-3*v+4*10*sin(5*pi*t)','v(0)=0','Dv(0)=0','t')

how can i get plot(t,v) ???

Answer 1

[Ameer Hamza]

You can use fplot()

syms  t v
v = dsolve('D2v=-2*Dv-3*v+4*10*sin(5*pi*t)','v(0)=0','Dv(0)=0','t')
fplot(v)

Also, defining ODEs as string is not recommended. You can define it using symbolic variables as follow

syms  v(t)
dv = diff(v, 1);
d2v = diff(v, 2);
eq = d2v == -2*dv-3*v+4*10*sin(5*pi*t);
conds = [v(0) == 0; dv(0)==0];
v = dsolve(eq, conds, t)
fplot(v)

[Sion Nam]

so thank you. really appreciate. I'm so impressed... there is no one who can help me..... l

[Ameer Hamza]

I am glad to be of help!!! To give x and y labels try

syms  v(t)
dv = diff(v, 1);
d2v = diff(v, 2);
eq = d2v == -2*dv-3*v+4*10*sin(5*pi*t);
conds = [v(0) == 0; dv(0)==0];
v = dsolve(eq, conds, t)
fplot(v)
xlabel('Time')
ylabel('v')

[Ameer Hamza]

Change fplot() too

fplot(v, [0 2])

[Sion Nam]

GRACIAS