“如何重载函数”；[“ffdf”和“[.ffdf”来自ff包（在R中）？

我在ff包中遇到写入错误。建议解决方案可能是重载函数“[只需重写”[另一种解决方案是增加系统设置，以允许同时打开更多文件。该系统设置是ff数据帧的限制因素。我解释了如何更改此设置

require(ff)
## For the assignment
get("[<-.ffdf")
args(get("[<-.ffdf"))
"[<-.ffdf" <- function (x, i, j, value){
  ## put your code in here and make sure it does not open too many ff files which are in x
}
## For the getter
args(get("[.ffdf"))
"[.ffdf" <- function (x, i, j, drop = ncols == 1){
  ## put your code in here and make sure it does not open too many ff files which are in x
}