NSolve Question
- To: mathgroup at smc.vnet.net
- Subject: [mg130856] NSolve Question
- From: "Hagwood, Charles R" <charles.hagwood at nist.gov>
- Date: Tue, 21 May 2013 00:05:13 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- Delivered-to: l-mathgroup@wolfram.com
- Delivered-to: mathgroup-outx@smc.vnet.net
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I have a known function f[x,y] and I want to solve the differential equation (1) for v[t], using NSolve partial [f(v[t],v'[t])/partial x +(d/dt)[partial f(v[t],v'[t])/partial y =0 (1) where v'[t] = derivative of v[t] with respect to t. I did a test to set up (1). I let f[x_,y_]:=x^2+y^3 v[t]:=Sin[t] g1[x_,y_]:=partial f(x,y)/partial x g2[x_,y_]:=partial f(x,y)/partial y g3[t_]:=g1[v[t],v'[t]]+D[g2[v[t],v'[t]],t] and asked Mathematica to evaluate g3[t] but, Mathematica gives an error. Thanks for the help Charles