Merge Multiple Data Frames by Row Names

Question

I\'m trying to merge multiple data frames by row names.

I know how to do it with two:

x = data.frame(a = c(1,2,3), row.names = letters[1:3])
y = data.fra         


        

Answer 1

maybe there exists a faster version using do.call or *apply, but this works in your case:

x = data.frame(X = c(1,2,3), row.names = letters[1:3])
y = data.frame(Y = c(1,2,3), row.names = letters[1:3])
z = data.frame(Z = c(1,2,3), row.names = letters[1:3])

merge.all <- function(x, ..., by = "row.names") {
  L <- list(...)
  for (i in seq_along(L)) {
    x <- merge(x, L[[i]], by = by)
    rownames(x) <- x$Row.names
    x$Row.names <- NULL
  }
  return(x)
}

merge.all(x,y,z)

important may be to define all the parameters (like by) in the function merge.all you want to forward to merge since the whole ... arguments are used in the list of objects to merge.