Hello -

I am looking for a function that would allow me to replace specific columns
in one data frame with columns in another data frame using a grouping
variable.

df <- read.csv("data.csv", header=T)
df1 <- aggregate(df[, c(8,9,10,11,12,27,28)], by=list(df$ID),
FUN=function(x) sub("(.*):", "\\1.", x))

How do I replace columns (8,9,10,11,12,27,28) in df with those from df1
using the ID column?

Thank you,

Alecia

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