Re: number not fitting in

*To*: mathgroup at smc.vnet.net*Subject*: [mg71567] Re: number not fitting in*From*: Bill Rowe <readnewsciv at sbcglobal.net>*Date*: Thu, 23 Nov 2006 05:41:38 -0500 (EST)

On 11/22/06 at 5:22 AM, JGBoone at gmail.com wrote: >First let me say that i am new to this mathematica and programming >business. I am programming a random speciation. I have a list, lyst, >that is a certain range. I want to replace, at random, one part of >lyst with something that is not in the original list, speciation. >When I table this, it puts the speciation outside the list and >inside the list. Can anyone help me? here's the line that seems to >be giving me trouble. It isn't really clear to me what you want to do. I don't understand, "when I table this, it puts the speciation outside the list and inside the list. >Can anyone help me? here's the line that seems to be giving me trouble. >lyst[[Random[Integer, {1, Length[lyst]}]]] = Random[Integer, >{Length[lyst]+ 1,Length[lyst] + 100}] You don't really say what you mean by trouble. The line above appears to be valid Mathematica syntax. And when I do: In[1]:= lyst=Range@5 Out[1]= {1,2,3,4,5} lyst[[Random[Integer,{1,Length[lyst]}]]]= Random[Integer,{Length[lyst]+1,Length[lyst]+100}] Out[2]= 17 In[3]:= lyst Out[3]= {1,2,17,4,5} it appears to me it is working correctly. I would have coded this a bit differently as follows: lyst[[Random[Integer,{1,Length[lyst]}]]]= Random[Integer,{1,100}]+Length[lyst] simply to reduce the amount of typing and the number of times Length[lyst] is called. Also, to me, the resulting code is clearer. But I don't see this as addressing your problem. -- To reply via email subtract one hundred and four