From: "Peña, Botp" <botp@...>
Date: 2008-06-10T10:22:29+09:00
Subject: Re: Random Number Stuff

From: stanislaus_d@hotmail.com [mailto:stanislaus_d@hotmail.com] 
# How would you create a random number generator thats limited to a
# specific rang? say 1930 - 1950

botp@botp-desktop:~$ qri rand
------------------------------------------------------------ Kernel#rand
     rand(max=0)    => number
------------------------------------------------------------------------
     Converts max to an integer using max1 = max.to_i.abs. If the
     result is zero, returns a pseudorandom floating point number
     greater than or equal to 0.0 and less than 1.0. Otherwise, returns
     a pseudorandom integer greater than or equal to zero and less than
     max1. Kernel::srand may be used to ensure repeatable sequences of
     random numbers between different runs of the program. Ruby
     currently uses a modified Mersenne Twister with a period of
     2**19937-1.

so,

irb(main):007:0> 1930 + rand(1950 - 1930)
=> 1940
irb(main):008:0> 1930 + rand(1950 - 1930)
=> 1932
irb(main):009:0> 1930 + rand(1950 - 1930)
=> 1947

kind regards -botp