How graph second order differential equations with Matlab?
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jake thompson
el 18 de En. de 2018
Comentada: Rena Berman
el 12 de Dic. de 2019
Looking to get some help on how to use matlab to solve the following equation problem 6, all help is appreciated! Thank You! I haven't used matlab in 2 years very rusty, image is reference to original problem statement.
4y"-20y'+25y=0
%%PROBLEM 6
clear; syms y(x)
ode = 4*diff(y,x,2) - 20*diff(y,x) + 25*y == 0;
%ySol(x) = dsolve(ode)
%ezplot('ode')
ySol = dsolve(ode, y(0) == 0)
figure
subplot(2,1,1)
ezplot(real(ySol(1)))
subplot(2,1,2)
ezplot(imag(ySol(1)))
ERROR
Warning: Contour not rendered for constant ZData
> In contour (line 52)
In ezplot>ezimplicit (line 315)
In ezplot (line 153)
In sym/ezplot (line 61)
1 comentario
Respuesta aceptada
Star Strider
el 18 de En. de 2018
The problem is that you need to define an initial condition for the first derivative.
Try this:
syms y(x)
Dy = diff(y);
D2y = diff(y,2);
ode = 4*D2y - 20*Dy + 25*y == 0;
ySol = dsolve(ode, y(0) == 0, Dy(0) == 1) % Define The Initial Condition For ‘Dy(0)’ To Be ‘Some Value’
figure
ezplot(ySol)
3 comentarios
Hamid Ghassri
el 8 de Jul. de 2019
Editada: Hamid Ghassri
el 8 de Jul. de 2019
how can you set a range for x
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