hey,

can someone give me an example of plotting a phase plane without solving the ODE

suppose i got an equation

diff(x(t),t$2)+x(t)=0

without solving it

plot a phase plane (  x dot, x )

thanks in advance

Hi,

Basically , I was doing some calculation algebracly.

I got some out like " arc(    AAAAAA  , BBBBBB) , arc( CCCCC,  DDDDDDD) "

I wonder what the comma between  A ns B mean?

meaning arc (AAAAA) and acr (BBBB)??

dose that mean I have 4 answer?

+++++++++++++++++++

I was solving some sin,cos function

I can find the numerical values of the answer

Hey

I was discusing Maple and Matlab with one of my friend.

He said that in Matlab he can do

a:=1:12

b:=sin(a)

plot(a,b)

that's easy in matlab to do so

i use

> ptlist:=NULL:
> for n to 12 do
> ptlist:=ptlist,[n,sin(n)]:
> od:
> plot([ptlist]);

do to so

is there any easy way to do that in maple?

like creat a sequence from 1 to 12? ( besides seq(n,n=1..12))

thanks

dsolve( {diff(x(t),t)=sqrt(x(t)), x(0)=0}, x(t));

use the theorem to test the ODE ,the solutions are unique

however maple gives me a unique solution?