| mode {base} | R Documentation |
Get or set the type or storage mode of an object.
mode(x) mode(x) <- value storage.mode(x) storage.mode(x) <- value
x |
any R object. |
value |
a character string giving the desired (storage) mode of the object. |
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 calls have mode
"(" which is S compatible.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
typeof for the R-internal “mode”,
attributes.
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)