Re: Do loop is faulty
- To: mathgroup at smc.vnet.net
- Subject: [mg55380] Re: [mg55368] Do loop is faulty
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Mon, 21 Mar 2005 03:01:45 -0500 (EST)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
a[[i]] is part i of the list a
a=Table[Random[Integer,{1,10}],{10}];
b=Table[Random[Integer,{1,4}],{10}];
c=Table[Integrate[a[[i]]*x*Sin[b[[i]]*x],{x,0,b[[i]]}],{i,10}];
c[[3]]
(3/4)*(-4*Cos[4] + Sin[4])
%//N
1.39333
Bob Hanlon
>
> From: "dumb_founded" <andreajagger_8 at hotmail.com>
To: mathgroup at smc.vnet.net
> Date: 2005/03/20 Sun AM 04:12:05 EST
> To: mathgroup at smc.vnet.net
> Subject: [mg55380] [mg55368] Do loop is faulty
>
> I define array a[i] and array b[i] of dimension 10. Then I go through
> the following Do loop, or try to, that is.
>
>
> Array[c,10];
> Do[c[i]=NIntegrate[a[i]*x*Sin[b[i]*x],{x,0,b[i]}]
>
> I get numerous error messages saying that b[i] is not a valid limit of
> integration.
>
> This is sheer headache. I will never try to use Mathematica for
> numerical analysis again.
>
> All your efforts on this matter are sincerely appreciated.
>
>
>
> Thanks
>
>