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. >