Write an Object to a File or Recreate it

Writes an ASCII text representation of an R object to a file or connection, or uses one to recreate the object.

file, programming, connection
dput(x, file = "", control = c("keepNA", "keepInteger", "showAttributes"))
an object.
either a character string naming a file or a connection. "" indicates output to the console.
character vector indicating deparsing options. See .deparseOpts for their description.

dput opens file and deparses the object x into that file. The object name is not written (unlike dump). If x is a function the associated environment is stripped. Hence scoping information can be lost.

Deparsing an object is difficult, and not always possible. With the default control, dput() attempts to deparse in a way that is readable, but for more complex or unusual objects (see dump, not likely to be parsed as identical to the original. Use control = "all" for the most complete deparsing; use control = NULL for the simplest deparsing, not even including attributes.

dput will warn if fewer characters were written to a file than expected, which may indicate a full or corrupt file system.

To display saved source rather than deparsing the internal representation include "useSource" in control. R currently saves source only for function definitions. If you do not care about source representation (e.g., for a data object), for speed set options(keep.source = FALSE) when calling source.


For dput, the first argument invisibly.For dget, the object created.


This is not a good way to transfer objects between R sessions. dump is better, but the function save is designed to be used for transporting R data, and will work with R objects that dput does not handle correctly as well as being much faster. To avoid the risk of a source attribute out of sync with the actual function definition, the source attribute of a function will never be written as an attribute.


Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.

See Also

deparse, dump, write.

  • dput
  • dget
library(base) ## Write an ASCII version of mean to the file "foo" dput(mean, "foo") ## And read it back into 'bar' bar <- dget("foo") unlink("foo") ## Create a function with comments baz <- function(x) { # Subtract from one 1-x } ## and display it dput(baz) ## and now display the saved source dput(baz, control = "useSource")
Documentation reproduced from package base, version 3.1.3, License: Part of R 3.1.3

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