ls                   package:base                   R Documentation

_L_i_s_t _O_b_j_e_c_t_s

_D_e_s_c_r_i_p_t_i_o_n:

     `ls' and `objects' return a vector of character strings giving the
     names of the objects in the specified environment. When invoked
     with no argument at the top level prompt, `ls' shows what data
     sets and functions a user has defined. When invoked with no
     argument inside a function, `ls' returns the names of the
     functions local variables. This is useful in conjunction with
     `browser'.

_U_s_a_g_e:

     ls(name, pos= -1, envir=pos.to.env(pos),
            all.names=FALSE, pattern)
     objects(name, pos= -1, envir=pos.to.env(pos),
            all.names=FALSE, pattern)

_A_r_g_u_m_e_n_t_s:

    name: the name of an attached object appearing in the vector of
          names returned by `search'.

     pos: the index of an attached object in the list returned by
          `search'.  Defaults to the current environment.

   envir: an evaluation environment.  Defaults to the one corresponding
          to `pos'.

all.names: a logical value.  If `TRUE', all object names are returned. 
          If `FALSE', names which begin with a ``.'' are omitted.

 pattern: an optional regular expression, see `grep'. Only names
          matching `pattern' are returned.

_S_e_e _A_l_s_o:

     `apropos' (or `find') for finding objects in the whole search
     path; `grep' for more details on ``regular expressions''; `class',
     `methods', etc. for object-oriented programming.

_E_x_a_m_p_l_e_s:

     .Ob <- 1
     ls(pat="O")
     ls(pat="O", all = T)    # also shows ".[foo]"

     # shows an empty list because inside myfunc no variables are defined
     myfunc <- function() {ls()}
     myfunc()

     # define a local variable inside myfunc
     myfunc <- function() {y <- 1; ls()}
     myfunc()                # shows "y"

