CODEWITHSUNDEEP
r
HaagenDaz
HaagenDaz

Reputation: 461

how to name data frame columns to column index

It is a very basic question.How can you set the column names of data frame to column index? So if you have 4 columns, column names will be 1 2 3 4. The data frame i am using can have up to 100 columns.

Upvotes: 0

Views: 90

Answers (2)

akrun
akrun

Reputation: 887008

It is not good to name the column names with names that start with numbers. Suppose, we name it as seq_along(D). It becomes unnecessarily complicated when we try to extract a column. For example,

names(D) <- seq_along(D)
D$1
#Error: unexpected numeric constant in "D$1"

In that case, we may need backticks or ""

D$"1"
#[1] 1 2 3
D$`1`
#[1] 1 2 3

However, the [ should work

D[["1"]]
#[1] 1 2 3

I would use

names(D) <- paste0("Col", seq_along(D))
D$Col1
#[1] 1 2 3

Or

D[["Col1"]]
#[1] 1 2 3

data

D <- data.frame(a=c(1,2,3),b=c(4,5,6),c=c(7,8,9),d=c(10,11,12))

Upvotes: 3

Brian Albert Monroe
Brian Albert Monroe

Reputation: 792

Just use names:

D <- data.frame(a=c(1,2,3),b=c(4,5,6),c=c(7,8,9),d=c(10,11,12))

names(D) <- 1:ncol(D) # sequence from 1 through the number of columns

Upvotes: 1

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