dump package:base R Documentation _T_e_x_t _R_e_p_r_e_s_e_n_t_a_t_i_o_n_s _o_f _R _O_b_j_e_c_t_s _D_e_s_c_r_i_p_t_i_o_n: This function takes a vector of names of R objects and produces text representations of the objects on a file or connection. A 'dump' file can usually be 'source'd into another R (or S) session. _U_s_a_g_e: dump(list, file = "dumpdata.R", append = FALSE, control = "all", envir = parent.frame(), evaluate = TRUE) _A_r_g_u_m_e_n_t_s: list: character. The names of one or more R objects to be dumped. file: either a character string naming a file or a connection. '""' indicates output to the console. append: if 'TRUE' and 'file' is a character string, output will be appended to 'file'; otherwise, it will overwrite the contents of 'file'. control: character vector indicating deparsing options. See '.deparseOpts' for their description. envir: the environment to search for objects. evaluate: logical. Should promises be evaluated? _D_e_t_a_i_l_s: If some of the objects named do not exist (in scope), they are omitted, with a warning. If 'file' is a file and no objects exist then no file is created. 'source'ing may not produce an identical copy of 'dump'ed objects. A warning is issued if it is likely that problems will arise, for example when dumping exotic or complex objects (see the Note). 'dump' will also warn if fewer characters were written to a file than expected, which may indicate a full or corrupt file system. A 'dump' file can be 'source'd into another R (or perhaps S) session, but the function 'save' is designed to be used for transporting R data, and will work with R objects that 'dump' does not handle. To produce a more readable representation of an object, use 'control = NULL'. This will skip attributes, and will make other simplifications that make 'source' less likely to produce an identical copy. See 'deparse' for details. To deparse the internal representation of a function rather than displaying the saved source, use 'control = c("keepInteger", "warnIncomplete", "keepNA")'. This will lose all formatting and comments, but may be useful in those cases where the saved source is no longer correct. Promises will normally only be encountered by users as a result of lazy-loading (when the default 'evaluate = TRUE' is essential) and after the use of 'delayedAssign', when 'evaluate = FALSE' might be intended. _V_a_l_u_e: An invisible character vector containing the names of the objects which were dumped. _N_o_t_e: As 'dump' is defined in the base name space, the 'base' package will be searched _before_ the global environment unless 'dump' is called from the top level prompt or the 'envir' argument is given explicitly. To avoid the risk of a source attribute becoming out of sync with the actual function definition, the source attribute of a function will never be dumped as an attribute. Currently environments, external pointers, weak references and objects of type 'S4' are not deparsed in a way that can be 'source'd. In addition, language objects are deparsed in a simple way whatever the value of 'control', and this includes not dumping their attributes (which will result in a warning). _R_e_f_e_r_e_n_c_e_s: Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) _The New S Language_. Wadsworth & Brooks/Cole. _S_e_e _A_l_s_o: 'dput', 'dget', 'write'. 'save' for a more reliable way to save R objects. _E_x_a_m_p_l_e_s: x <- 1; y <- 1:10 dump(ls(pattern = '^[xyz]'), "xyz.Rdmped") print(.Last.value) unlink("xyz.Rdmped")