# [R] loop in R

David Winsemius dwinsemius at comcast.net
Wed Oct 6 12:14:10 CEST 2010

```Is this homework?

--
David.
On Oct 6, 2010, at 5:51 AM, Julia Lira wrote:

>
> Dear all,
>
>
>
> I need to do a loop in R, but I am not sure the software is
> generating "n" times the variables I request differently. When I ask
> to print the last matrix created, I just can see the loop for n=1.
>
> To be more precise, supose I need to simulate 10 times one variable
> and I want to fit the 10 variables simulated in a matrix. I dont
> really know what I am doing wrong, but I just can see 1 variable
> created.
>
> Below follows an example of what I want:
>
>
>
> rm(list=ls()) #remove almost everything in the memory
>
>
>
> set.seed(180185)
>
>
>
> #loop: create 10 times the variables (u1,u2,u3,u4,u5)
>
>
>
> for (i in 1:10){
> u1 <- c(runif(200,0,1))
> u2 <- c(runif(200,0,1))
> u3 <- c(runif(200,0,1))
> u4 <- c(runif(200,0,1))
> u5 <- c(runif(200,0,1))
> u <- c(u1,u2,u3,u4,u5)
> mu <- matrix(u, nrow=1000, ncol=1)
> }
>
>
> As you can see, when I print(mu), I just can see a matrix with the
> vector u in one column. I also tried to increase the number of
> columns to 10 (or i), but the matrix will have 10 times the same
> vector. And what I need is like a Monte Carlo simulation, where I
> have to simulate 10 times the variables above.
>
>
>
> Am I doing something wrong?
>
>
>
> Thanks in advance!
>
>
>
> Julia
>
> 	[[alternative HTML version deleted]]
>
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> and provide commented, minimal, self-contained, reproducible code.

David Winsemius, MD
West Hartford, CT

```

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