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Re: NDSolve[]

• To: mathgroup at smc.vnet.net
• Subject: [mg123515] Re: NDSolve[]
• From: Oliver Ruebenkoenig <ruebenko at wolfram.com>
• Date: Sat, 10 Dec 2011 07:26:32 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <201112091058.FAA03928@smc.vnet.net>

> Subject: NDSolve[]
> To: mathgroup at smc.vnet.net
>
> For the same equations, why does the first method as following give
> the error but the other one give the desired result?
>
> NDSolve[{Derivative[x[t], t] == -y[t] - x[t]^2,
>  Derivative[y[t], t] == 2*x[t] - y[t], x[0] == y[0] == 1}, {x,
>  y}, {t, 10}]
>

NDSolve[{Derivative[1][x][t] == -y[t] - x[t]^2,
   Derivative[1][y][t] == 2*x[t] - y[t], x[0] == y[0] == 1}, {x,
   y}, {t, 10}]

is what you want.

Oliver

> NDSolve[{x'[t] == -y[t] - x[t]^2, y'[t] == 2*x[t] - y[t],
>  x[0] == y[0] == 1}, {x, y}, {t, 10}]
>
>

• References:
  • [no subject]
    • From: "Steven M. Christensen" <steve@smc.vnet.net>