mode                  package:base                  R Documentation

_T_h_e (_S_t_o_r_a_g_e) _M_o_d_e _o_f _a_n _O_b_j_e_c_t

_U_s_a_g_e:

     mode(x)
     mode(x) <- "<mode>"
     storage.mode(x)
     storage.mode(x) <- "<mode>"

_D_e_t_a_i_l_s:

     Both `mode' and `storage.mode' return a character string giving
     the (storage) mode of the object - often the same - both relying
     on the output of `typeof(x)', see the example below.

     The two assignment versions are currently identical.  Both
     `mode(x) <- newmode' and `storage.mode(x) <- newmode' change the
     `mode' or `storage.mode' of object `x' to `newmode'.

     As storage mode "single" is only a pseudo-mode in R, it will not
     be reported by `mode' or `storage.mode': use `attr(object,
     "Csingle")' to examine this. However, the assignment versions can
     be used to set the mode to `"single"', which sets the real mode to
     `"double"' and the `"Csingle"' attribute to `TRUE'. Setting any
     other mode will remove this attribute.

     Note (in the examples below) that some `call's have mode `"("'
     which is S compatible.

_S_e_e _A_l_s_o:

     `typeof' for the R-internal ``mode'', `attributes'.

_E_x_a_m_p_l_e_s:

     sapply(options(),mode)

     cex3 <- c("NULL","1","1:1","1i","list(1)","data.frame(x=1)", "pairlist(pi)",
       "c", "lm", "formals(lm)[[1]]",  "formals(lm)[[2]]",
       "y~x","expression((1))[[1]]", "(y~x)[[1]]", "expression(x <- pi)[[1]][[1]]")
     lex3 <- sapply(cex3, function(x) eval(parse(text=x)))
     mex3 <- t(sapply(lex3, function(x) c(typeof(x), storage.mode(x), mode(x))))
     dimnames(mex3) <- list(cex3, c("typeof(.)","storage.mode(.)","mode(.)"))
     mex3

     ## This also makes a local copy of  `pi':
     storage.mode(pi) <- "complex"
     storage.mode(pi)
     rm(pi)

