Re: Saving PDE Derivatives

*To*: mathgroup at smc.vnet.net*Subject*: [mg126484] Re: Saving PDE Derivatives*From*: "Kevin J. McCann" <kjm at KevinMcCann.com>*Date*: Mon, 14 May 2012 01:34:27 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <jonm8b$gd5$1@smc.vnet.net>

You have an error in the code below. y[x,0]==0 should be something else. Kevin On 5/13/2012 3:01 AM, deltafrog wrote: > Hi, > > I'm using NDSolve, in order to solve a PDE and I won't to evaluate the results plus the derivatives of the result. Example: > > NDSolve[{Derivative[0,1][u][x,t]-Derivative[1,0][u][x,t]-Derivative[1,0][v][x,t]==0, y[x,0]==0, Derivative[1,0][u][0,t], Derivative[1,0][v][0,t]},{u,v}, {x,0,10}, {t,0,10}] > > When I want to evaluate the results I get results for u, v, u_t, and v_t, but I can't evaluate u_x nor v_x. These obviously have to be calculated somehow? How can I tell mathematica 8 to save the results? >