Re: newbie: explicit function works, "function object" doesn't

*To*: mathgroup at smc.vnet.net*Subject*: [mg96234] Re: newbie: explicit function works, "function object" doesn't*From*: Tom Roche <tlroche at gmail.com>*Date*: Tue, 10 Feb 2009 05:48:20 -0500 (EST)*References*: <gmp0st$c30$1@smc.vnet.net>

Daniel Lichtblau Mon, Feb 9, 2009 at 9:45 AM > Offhand I do not know why your use of happysoln[t_] fails. FWIW, it's modeled on the approach used in http://reference.wolfram.com/mathematica/howto/SolveADifferentialEquation.html (I'm definitely still @ the cut'n'paste stage.) > You can get it to work as below, by putting everything inside the > Manipulate. > Manipulate[ > theta'[0] == v0; > theta[0] == theta0; > linearPendulum = theta''[t] == -omega^2 theta[t]; > soln = DSolve[{linearPendulum, theta'[0] == v0, theta[0] == theta0}, theta[t], t]; > Plot[theta[t] /. First[soln], {t, -2 Pi, 2 Pi}], {{omega, 1}, 0, 5}, {{theta0, 1}, 0, 5}, {{v0, 1}, 0, 5}] That works! though I'm wondering why the statements need to nest inside the call to Manipulate. (I'm also assuming that First[soln] == soln[[1]]). Anyway, consider this solved. Thanks, Tom Roche <Tom_Roche at pobox.com>