Message-ID: <1234258231.8687.8.camel@R1-Thux>
Date: 2009-02-10T09:30:31Z
From: Bernardo Rangel Tura
Subject: Choosing a random number between x and y
In-Reply-To: <21914106.post@talk.nabble.com>
On Mon, 2009-02-09 at 06:40 -0800, Vie wrote:
> Hi,
>
> Ive been trying to find a function that will allow me to pull out a number
> between a minimum and maximum threshold.
>
> I want a random decimal number between, for example, 0 and 0.5 or 0 and 0.7.
> I've been searching everywhere for a function that will allow me to do this
> in R, but I have yet to be successful. Any help would be much appreciated.
>
> Thanks in advance
Hi Vie
I don't understand if you need a only random generation or mixture
random generation, so i will make the 3 examples Using runif
1- Random 10 number Retween 0 and 0.5 runif(10,0,0.5)
2 -Random 20 number Retween 0 and 0.7 runif(20,0,0.7)
3- Random 40 number of mixture two random uniforme random 1 and 2 with
p(random1)= 0.3 and p(random=2) = 0.7
ifelse(runif(40)>.3,runif(40,0,0.7),runif(40,0,0.5))
--
Bernardo Rangel Tura, M.D,MPH,Ph.D
National Institute of Cardiology
Brazil