lucy b wrote:
>
> I have a workspace containing only data frame objects. I would like to
> loop though each one and clean-up text columns in them. How can I have
> R loop through the list? I have tried to find an answer in R help but
> the closest solution I can find is to make a static list of data
> frames, as illustrated in this recent post:
> ...
> I would like to avoid having to type-out a very long list over and
> over again. I have tried every variation I could think of similar to:
>
> for(df in list(noquote(ls()))) {
>
> do stuff with df
>
> }
>
If you name your data frames consistently (e.g. df1, df2, df3 etc.), then
you can access them using mget:
df1 <- data.frame(a=runif(10), b=letters[1:10])
df2 <- data.frame(c=rnorm(5))
df3 <- data.frame(11:20)
dataframes <- mget(paste("df", 1:3, sep=""), envir=.GlobalEnv)
Alternatively, if you want every dataframe in your workspace, try:
vars <- ls()
nvars <- length(vars)
dataframes <-list()
j <- 1
for(i in 1:nvars)
{
if(class(get(vars[i]))=="data.frame")
{
dataframes[[j]] <- get(vars[i])
names(dataframes)[j] <- vars[i]
j <- j+1
}
}
Regards,
Richie.
Mathematical Sciences Unit
HSL
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