[R] Monte Carlo simulation in R

[David Winsemius]

On Mar 23, 2010, at 9:05 PM, Hongwei Dong wrote:

> Hi, R-helpers,
>
> I'm trying to use R to do a Monte Carlo simulation and need the  
> help. What I
> have is a matrix that consists of the probabilities for the persons to
> choose zones. For example, in the matrix shown below, each column  
> represents
> a person, and each row represents a zone. So, the probability that  
> the first
> person will choose the 2nd zone is 30%.
>
> 25% 30% 10%  30% 20% 0%  20% 50% 60%  50% 0% 10%  20% 0% 20%

As Alex Trebeck would say: Can you put that in the form of an R data  
object?

>
> Based on this matrix, I want to locate the persons to zones based on  
> the
> probability using a Monte Carlo method. The result I want to see is  
> like
> this:
>
> 0 0 0  0 0 0  0 1 1  1 0 0  0 0 0
>
> Could anyone please give some help? Thanks.

You cannot specify what the result _will_ be and call the process  
simulation of results at the same time. The sample function should  
work for a vector. Why not use it?

-- 
David.


David Winsemius, MD
West Hartford, CT