Re: NIntegrate a list

*To*: mathgroup at smc.vnet.net*Subject*: [mg52961] Re: [mg52940] NIntegrate a list*From*: Bob Hanlon <hanlonr at cox.net>*Date*: Sat, 18 Dec 2004 03:59:34 -0500 (EST)*Reply-to*: hanlonr at cox.net*Sender*: owner-wri-mathgroup at wolfram.com

x is not numeric if the variable of integration is theta. Further, you need to use Evaluate. Presumably, you meant Integrate[x*Sin[x]*{1,2},{x,-Pi,Pi}] {2*Pi, 4*Pi} NIntegrate[Evaluate[x*Sin[x]*{1,2}],{x,-Pi,Pi}] {6.283185307179588, 12.566370614359176} Bob Hanlon > > From: "Aaron Fude" <aaronfude at yahoo.com> To: mathgroup at smc.vnet.net > Date: 2004/12/17 Fri AM 05:19:17 EST > To: mathgroup at smc.vnet.net > Subject: [mg52961] [mg52940] NIntegrate a list > > Hi, > > I can Integrate this, but apparently not NIntegrate this: > > Integrate[x*Sin[x]*{1, 2}, {theta, -Pi, Pi}] > > but not > > NIntegrate[x*Sin[x]*{1, 2}, {theta, -Pi, Pi}] > > Is there a good way to do this (w/o writing loops)? > > Many thanks! > > Aaron Fude > >