       Re: Differential equation

• To: mathgroup at smc.vnet.net
• Subject: [mg69492] Re: Differential equation
• From: "ben" <benjamin.friedrich at gmail.com>
• Date: Thu, 14 Sep 2006 06:55:28 -0400 (EDT)
• References: <ee8gca$imk$1@smc.vnet.net>

Hi Mike,

this cannot work:
you have two degrees of freedom (x and y),
but only one ODE; you need as many ODEs
as you have degrees of freedom.

However, you can express y in terms of x

x(t)-A*dy/dt=0
A*dy/dt=x
dy/dt=A^-1 * x
dy=A^-1 * x dt
y(t)-y(0)=\int_0^t dt' A^-1 x(t')

Bye
Ben

Mike schrieb:

> Dear all,
>
> I would kindly ask for an assistance please.
> I do not know how to solve this differential equation :
>
> x(t)-A*dy/dt=0
>
> Where,
> A - constant
> x - variable as a function of time (t)
> y - variable as a function of time (t)
> t - time
>
>
> Thanks Mike77



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