Re: For Loop and Array related
- To: mathgroup at smc.vnet.net
- Subject: [mg57994] Re: For Loop and Array related
- From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
- Date: Thu, 16 Jun 2005 05:35:51 -0400 (EDT)
- Organization: Uni Leipzig
- References: <d8oucl$t6q$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
try
Lattice = Table[0, {100}];
For[i = 1, i < 1601, i++,
k = Random[Integer, {1, 100}];
Lattice[[k]]++
]
Regards
Jens
<mchangun at gmail.com> schrieb im Newsbeitrag
news:d8oucl$t6q$1 at smc.vnet.net...
> Hi All,
>
> I have an array with 100 elements, all set to
> zero initially. Then I
> want to randomly choose one element and increase
> its value by one, and
> repeat this 16000 times. Here is my code:
>
> Lattice = Table[0, {n, 100}];
> For[i = 1, i = 16000, i++,
> Lattice[[Random[Integer, {1, 100}]]]++]
>
> So now if I add all the elements in the list
> Lattice together, I should
> get 16000 (I use Total[Lattice] to get the sum
> of the list). But this
> doesn't happen, and strangely, each time I run
> this, the sum of the
> list is different! What am I doing wrong?
>
> Also I'm aware that a lot of Mathematica newbies
> try and write code
> like it were C++ and I think i've fallen into
> this trap as well. So is
> there a different (more Mathematica) way which I
> can implement the
> above?
>
> Thanks in advanced.
>