Re: function manipulation
- To: mathgroup at smc.vnet.net
- Subject: [mg127831] Re: function manipulation
- From: Bob Hanlon <hanlonr357 at gmail.com>
- Date: Sat, 25 Aug 2012 04:26:01 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- Delivered-to: l-mathgroup@wolfram.com
- Delivered-to: mathgroup-newout@smc.vnet.net
- Delivered-to: mathgroup-newsend@smc.vnet.net
- References: <20120824005115.06CE5687C@smc.vnet.net>
gl2 = Module[ {eqn, z = Subscript[\[Tau], xy]''[x], coef}, eqn = Subscript[g, K] (Subscript[e, 1] Subscript[t, 1] + Subscript[e, 2] Subscript[t, 2]) Subscript[\[Tau], xy][x] == Subscript[e, 1] Subscript[e, 2] Subscript[t, 1] Subscript[t, 2] Subscript[t, K] (Subscript[\[Tau], xy]^\[Prime]\[Prime])[x]; (z /. Solve[eqn, z][[1]]) - z == 0]; {gl3, repl} = Module[ {coef = Coefficient[gl2[[1]], Subscript[\[Tau], xy][x]]}, {gl2 /. Numerator[coef] -> \[Omega]^2*Denominator[coef], \[Omega] -> Sqrt[coef]}]; gl3 \[Omega]^2*Subscript[\[Tau], xy][x] - Derivative[2][Subscript[ \[Tau], xy]][x] == 0 (gl3 /. repl) === gl2 True Bob Hanlon On Fri, Aug 24, 2012 at 6:39 AM, Andreas Talmon l'Arm=E9e <talmon at fsm.tu-darmstadt.de> wrote: > Hi > > Thanks, this did exactly the job. But unfortunately I got another issue. I > wanted to replace the fraction by the parameter omega^2 in gl3. So far it > worked well. But then I tried to define omega for further calculations. At > the end it did not matter if I solved gl2 or gl3 with DSolve. omega^2 was > always replaced by its definition. Can I force mathematica to use the much > shorter parameter omega^2 for a clear arrangement. I attached the file where > I tried to do the calculation : > > Best regards Andreas Talmon > > >
- References:
- function manipulation
- From: Andreas Talmon <talmon@fsm.tu-darmstadt.de>
- function manipulation