I have data frame that I have to initialized as empty data frame. Now I have only column available, I want to add it to empty data frame. How I can do it? I will not sure what will be length of column in advance.
Example
df = data.frame(a= NA, b = NA, col1= NA)
....
nrow(col1) # Here I will know length of column, and I only have one column available here.
df$col1 <- col1
error is as follows:
Error in `$<-.data.frame`(`*tmp*`, "a", value = c("1", :
replacement has 5 rows, data has 1
Any help will be greatful
use cbind
df = data.frame(a= NA, b = NA)
col1 <- c(1,2,3,4,5)
df <- cbind(df, col1)
# a b col1
# 1 NA NA 1
# 2 NA NA 2
# 3 NA NA 3
# 4 NA NA 4
# 5 NA NA 5
After your edits, you can still use cbind, but you'll need to drop the existing column first (or handle the duplicate columns after the cbind)
cbind(df[, 1:2], col1)
## or if you don't know the column indeces
## cbind(df[, !names(df) %in% c("col1")], col1)
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