Re: Minimization problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg132357] Re: Minimization problem*From*: Bob Hanlon <hanlonr357 at gmail.com>*Date*: Wed, 19 Feb 2014 02:01:31 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-outx@smc.vnet.net*Delivered-to*: mathgroup-newsendx@smc.vnet.net*References*: <20140218040434.F19BC69E6@smc.vnet.net>

Presumably there is a problem with your definition of f; however, since you have not given an example of a simpler function which demonstrates your problem, I can only guess. var = {h1, h2, h3, h4}; cons = 0.1 < # <= 1 & /@ var; f[{h1_?NumericQ, h2_?NumericQ, h3_?NumericQ, h4_?NumericQ}] := Abs[-2 h1 + 7 h2 - 3 h3 + 8 h4 + 3]; sol = NMinimize[{f[var], cons}, var] {1.45916*10^-9, {h1 -> 0.939012, h2 -> 0.1, h3 -> 0.959647, h4 -> 0.132121}} sol[[1]] == f[var] /. sol[[2]] True Bob Hanlon On Mon, Feb 17, 2014 at 11:04 PM, PAR123 <reiser.paul at gmail.com> wrote: > I'm trying to minimize f[{h1,h2,h3,h4}] subject to constraints that all > h's lie between 0.1 and 1. Trying to use NMinimize: > NMinimize[{f[{h1, h2, h3, h4}], {h1 > 0.1, h1 <= 1.0, h2 > 0.1, > h2 <= 1.0, h3 > 0.1, h3 <= 1.0, h4 > 0.1, h4 <= 1.0}}, {h1, h2, h3, > h4}] > > I keep getting errors that indicate FindMinimum is attempting to call f[] > with symbolic h's, not numbers. f[] will return a number if the inputs are > numbers, but if they are symbols, its not going to happen. Is there a > simple thing I am doing wrong? > >

**References**:**Minimization problem***From:*PAR123 <reiser.paul@gmail.com>