Please Help Me! i want to plot a equation dx/dt = y-5; dy/dt = -x+5; x(0)=0,y(0)=0. What type of code solver should i use.

plot a equation

 dx/dt = y-5; dy/dt = -x+5; x(0)=0,y(0)=0.

Answer 1

[madhan ravi]

   syms x(t) y(t) %EDITED ANSWER
   ode1=diff(x) == y-5;
   ode2=diff(y)== -x+5;
   [x,y]=dsolve(ode1,ode2,x(0)==0,y(0)==0)
   fplot(subs(x),'r')
   hold on 
   fplot(subs(y),'g')

[madhan ravi]

use dsolve

[madhan ravi]

why not?

[madhan ravi]

Try the edited answer

[madhan ravi]

if fplot doesn't work , try:

 clear all 
 syms x(t) y(t)
 ode1=diff(x) == y-5;
 ode2=diff(y)== -x+5;
 [x,y]=dsolve(ode1,ode2,x(0)==0,y(0)==0)
 t=linspace(-2*pi,2*pi,1000)
 x = subs(x,t)
 y = subs(y,t)
 plot(t,x,'r')
 hold on 
 plot(t,y,'g')

[Nguyen Dat]

Previous question has been wrong, please help me this: With dx/dt=y-5 , dy/dt=-x+5, x(0)=0, y(0)=0, draw the graph of y(x) !! Thanks so much !!

[Nguyen Dat]

Previous question has been wrong, please help me this: With dx/dt=y-5 , dy/dt=-x+5, x(0)=0, y(0)=0, draw the graph of y(x) !! Thanks so much !!

[madhan ravi]

y(x) what does it mean y is a function of x and x is a function of t?

[Nguyen Dat]

Oh, both x and y are function of t !! and i need draw y(x)

[madhan ravi]

So

fplot(subs(x),subs(y),'g')

Answer 2

[Torsten]

Use "dsolve" for solving and "fplot" for plotting.

Best wishes

Torsten.

Answer 3

[Nguyen Dat]

So Sorry, The previous question has been wrong, please help me this: With dx/dt=y-5 , dy/dt=-x+5, x(0)=0, y(0)=0, draw the graph of y(x) !! Thanks so much !!