[R] Repeating a series of commands

[Bert Gunter]

encapsulate them into a function and call the function ??

-- Bert

On Thu, Oct 11, 2012 at 11:09 AM, KoopaTrooper <ncooper1 at tulane.edu> wrote:
> I'm trying to figure out how to repeat a series of commands in R and have the
> outputs added to a dataframe after each iteration.
>
> My code starts this way...
>
> a<-read.csv("File1.csv")
> b<-read.csv("File2.csv")
>
> a$Z<-ifelse(a$Z=="L",sample(1:4,length(a$Z),replace=TRUE),ifelse(a$Z=="M",sample(5:8,length(a$Z),replace=TRUE),ifelse(a$Z=="U",sample(9:10,length(a$Z),replace=TRUE),"")))
> a$Z<-as.numeric(a$Z)
> b$Z<-ifelse(b$Z=="L",sample(1:4,length(b$Z),replace=TRUE),ifelse(b$Z=="M",sample(5:8,length(b$Z),replace=TRUE),ifelse(b$Z=="U",sample(9:10,length(b$Z),replace=TRUE),"")))
> b$Z<-as.numeric(b$Z)
>
> This is basically just starting off with a new and partially random data set
> every time that then goes through a bunch of other commands (not shown) and
> ends with the following outputs saved.
>
> Output1, Output2, Output3, Output4
>
> where each of these is just a single number. My questions is:
>
> 1. How do I repeat the entire series of commands x number of times and save
> each of the outputs into a structure like this:
>                       Output1      Output2     Output3     Output4
> Iteration 1
> Iteration 2
> Iteration 3
> etc.
>
> Not even sure where to start. Are loops the answer? Thanks,
>
>
>
>
>
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-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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