Re: pde's
- To: mathgroup at smc.vnet.net
- Subject: [mg28131] Re: [mg28103] pde's
- From: Tomas Garza <tgarza01 at prodigy.net.mx>
- Date: Sat, 31 Mar 2001 02:59:01 -0500 (EST)
- References: <200103300913.EAA09897@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
If you're really new to Mathematica, I think you're trying to go too fast.
My advice would be to try easier tasks first. On first look, I find in your
program all sorts of incomprehensible things, in addition to obvious syntax
errors. That is why you get all kind of error messages when trying to
evaluate.
Tomas Garza
Mexico Ciity
----- Original Message -----
From: "sahni mayank" <sahnimayank at yahoo.com>
To: mathgroup at smc.vnet.net
Subject: [mg28131] [mg28103] pde's
> hi all
> i'm new to mathematica and have written the foll
> program but unfortunately it gives me a host of
> errors.please tell me whats wrong.
> thanks.
> m.s.
>
>
> Da = 0.1
> Le = 1
> g = 20
> ord = 1
> q = 0
> x = 0
> sol1 = DSolve[{
> n = (3*phi*Coth[3*phi] - 1)/(3*phi^2),
>
> phi = Sqrt[Exp[q_s/(1 + q_s/g)]],
>
> D[F[q_s, phi, B], q_s] + (q_s -
> q)*(1/n)*D[n[q_s, phi, B], q_s] =
> 1 - (q_s -q)*{1/((1 + q_s/g)^2) -
> {(ord*Le/B)/(1 -x - (Le/B)*(q_s - q))}},
>
> D[F[q_s, phi, B],B] = -(q_s - q)*(1/B +
> (1/n)*(D[n[q_s, phi, B],B]) - {(ord*Le*(q_s -
> q)/B^2)/(1 -x - (Le/B)*(q_s - q))}),
>
> D[n[q_s, phi, B],phi] = {(9*phi^2 + 2 -
> 3*phi*Coth[3*phi][1 + 3*p*Coth[3*phi]])/(3*
> phi^3)},
>
> D[n[q_s, phi, B], q_s] =
> D[n[q_s, phi, B],phi]*(phi/2)*{1/((1 +
> q_s/g)^2) - {((ord - 1)*Le/B)/(1 -x - (Le/B)*(q_s -
> q))}},
>
> D[n[q_s, phi, B], B] = 0,
>
> F[q_s] = (q_s - q) - (B*Da/Le)*Exp[q_s/(1 +
> q_s/g)]*(1 - x - (Le/B)*(q_s - q))*n = 0,
>
> S = -{(B/q_s)*(D[F[q_s, phi, B], B]/D[F[q_s,
> phi, B], q_s])},}]
> Plot[Evaluate[{S} /. sol1, {q_s} /. sol1], {B}]
>
>
>
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- References:
- pde's
- From: sahni mayank <sahnimayank@yahoo.com>
- pde's