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From: "Sparks, John James"
To: r-help@r-project.org
Cc:
Sent: Sunday, April 14, 2013 1:19 PM
Subject: [R] Create New Column Inside Data Frame for Many Data Frames
Dear R Helpers,
I have a large number of data frames and I need to create a new column
inside each data frame. Be
I suggest you read the section on indexing in the Introduction to R document
that comes with R. In particular, look at the [[i]] notation. This comes in
handy in a couple of ways.
First, you shouldn't be working with "many" data frames at once that are stored
as separately-named objects. If you
Hello,
I'm not completely sure I've understood. Your variable 'letters' iholds
the names of the data.frames? If so it's better if you put yoyr
data.frames in a list and then use that list. Something like
lst <- list(A, B)
for (i in seq_along(lst)){
lst[[i]][["Rate"]] <- ROC(lst[[i]]
Dear R Helpers,
I have a large number of data frames and I need to create a new column
inside each data frame. Because there is a large number, I need to "loop"
through this, but I don't know the syntax of assigning a new column name
dynamically.
Below is a simple example of what I need to do.
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