How to pass extra argument to the function argument of do.call in R

Question

I\'d like to pass argument (stringsAsFactors=FALSE) to rbind in do.call. But the following doesn\'t work:

data <- do.ca         


        

Answer 1

do.call(rbind.data.frame, c(list(iris), list(iris), stringsAsFactors=FALSE))

would have been my answer, if it wasn't for the fact that rbind does not know what to do with stringsAsFactors (but cbind.data.frame would).

The output of strsplit is presumably a list of vectors, in which case rbind creates a matrix. You can specify stringsAsFactors when converting this matrix to a data.frame,

data.frame(do.call(rbind, list(1:10, letters[1:10])), stringsAsFactors=FALSE)

Answer 2

I'm not sure if your function call is valid, but try this:

data <- do.call(rbind,
  c(strsplit(readLines("/home/jianfezhang/adoption.txt"),split="\t#\t"),
  list(stringsAsFactors=FALSE))

You need pass all arguments to do.call via one list. You can concat two list by c

> c(list(1, 2), list(3, 4))
[[1]]
[1] 1

[[2]]
[1] 2

[[3]]
[1] 3

[[4]]
[1] 4

Answer 3

Alternatively, you can set stringsAsFactors to FALSE globally using options:

options(stringsAsFactors=FALSE)

Setting this at the top of the script will enforce this throughout the script. You could even add to .Rprofile to set this option for the all the R sessions you open.