question about NIntegrate

*To*: mathgroup at smc.vnet.net*Subject*: [mg128739] question about NIntegrate*From*: dsmirnov90 at gmail.com*Date*: Thu, 22 Nov 2012 04:33:10 -0500 (EST)*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

Hi, I want to use function NIntegrate to integrate a rather complicated function which should be calculated numerically and returns a Table. However, when I write something of the kind: Clear[f] f[(a_)?NumericQ] := {a^2}; NIntegrate[f[x], {x, -1, 1}] I get an error: "Integrand f[x] is not numerical at {x} = {-0.984085}" Strangely, the following code works fine: NIntegrate[f[1], {x, -1, 1}] giving the result {2.} What am I doing wrong? Dmitry

**Follow-Ups**:**Re: question about NIntegrate***From:*Bob Hanlon <hanlonr357@gmail.com>