add a data frame to a constructed name

Question

I have this

for(i in 1:10)

and within it, I have a data frame: e.g.

df<-1:100

and I want to assign the dataframe to a specific name which I want to create

something like: (not that it works)

paste("name", variable[i])<- df

Edit:

How would I then go about accessing those constructed values in another loop (assuming i've used assign)

 datalist <- paste("a",1:100,sep="") for (i in 1:length(datalist)){ }

nullglob · Accepted Answer · 2010-07-29 09:40:56Z

7

I suggest assign, as illustrated here:

for(i in 1:100){ df <- data.frame(x = rnorm(10),y = rpois(10,10)) assign(paste('df',i,sep=''),df) }

answered Jul 29, 2010 at 9:40

nullglob

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2 Comments

Nathaniel Saxe Over a year ago

Do you know how I would be able to access those assigned values in another loop?

Marek Over a year ago

@Nathaniel get(paste('df',i,sep='')) But if you need it you could use list instead. list_of_df <- lapply(1:100, function(i) data.frame(...)) and then in another loop/lapply use list_of_df[[i]].

Greg · Accepted Answer · 2010-07-29 14:52:15Z

You could store the output of your loop in a list:

set.seed(10) x = list() for(i in 1:10){ x[[i]] <- data.frame(x = rnorm(100), y = rnorm(100)) }

Then x will be a list of length 10 and each element of the list will be of dim c(100, 2)

> length(x) [1] 10 > dim(x[[1]]) [1] 100 2 >

Of course you could name the elements of the list, as well:

names(x) = letters[1:10] x[["a"]] x y 1 0.01874617 -0.76180434 2 -0.18425254 0.41937541 3 -1.37133055 -1.03994336 4 -0.59916772 0.71157397 5 0.29454513 -0.63321301 6 0.38979430 0.56317466 ...

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