R - Reading vector or dataframe from string

Question

I would like to read a data frame from a string. It is a bit difficult to explain, and, so far I couldn't find the answer anywhere.

Let's imagine I have several data frames: "Param1", "Param2", ... "Param100". I would like to be able to access them from a for loop:

for (i in c(1:100)){
  a <- paste0("Param",i)
  b <- ??? (a)
}

Where b would become "Param1", ... "Param100" when i varies from 1 to 100.

Josh · Accepted Answer · 2015-08-05 10:25:18Z

2

Use get.

for (i in 1:100) {
  b <- get(paste0("Param", i))
}

answered Aug 5, 2015 at 10:25

Josh

1,27812 silver badges25 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

Cant you just use mget without a loop?

Yes, you could. mget(paste0("Param", 1:100)) I believe would work. You'll end up with a list to operate on.

More like mget(ls(pattern = paste0("Param", 1:100)))

Oops, thanks David. I've fixed my comment of a bug. Its a bit easier than your suggestion though, the ls part isn't necessary I think.

I think it is necessary.

|