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NDSolve with Boundary Condition

• To: mathgroup at smc.vnet.net
• Subject: [mg107694] NDSolve with Boundary Condition
• From: marjan <marjan84 at gmail.com>
• Date: Tue, 23 Feb 2010 08:03:28 -0500 (EST)

Dear MathGroup members,

Please help me with this:
I am trying to solve an numerical equation: sol = NDSolve[{D[Y[z, t],
z, z] +
     10^12 Sin[Y[z, t]] Cos[Y[z, t]] == D[Y[z, t], t]
with boundary conditions: d(Y[a, t])/dz = 2*10^6  and   d(Y[b, t])/dz
= 2*10^6 , but i don't know how to write the boundary condition in
this equation. when I write it like D[Y[a, t], z] == 20*10^5, D[Y [b,
t], z] == 20*10^5 Mathematica gives this error

NDSolve::deqn: equation or list of equations expected instead of
"false" in the first argument {D[Y[z, t], z, z] +
     10^12 Sin[Y[z, t]] Cos[Y[z, t]] == D[Y[z, t], t] , False,False}

Thanks for your attention
Marjan

• Follow-Ups:
  • Re: NDSolve with Boundary Condition
    • From: Patrick Scheibe <pscheibe@trm.uni-leipzig.de>