The R Project SVN R

#### Which functions in R  are  .Primitive()  / which should be ?
#### ------------------------------------------------------------
#### M.Maechler, May, 1998.
####
#### ==> ../doc/manual/primitive-funs.tex
####     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

bpos <- match("package:base",search())
nn <- ls(pos=bpos)
length(nn) # 844 [R 0.62.0, March 25, 1998;  1067 R 0.64.0 March 1999]

is.primitive <- function (obj) is.function(obj) && is.null(args(obj))
is.special <- function(obj) typeof(obj) == "special"

Primf <- nn[sapply(nn, function(N) is.primitive(get(N, pos=bpos)))]
length(Primf) ## 195  R 0.62.0, March 25, 1998
## 132  R 0.62.2+
Real.primitives <-
    list(
     specials = c("{", "(", "if", "for", "while", "repeat", "break", "next",
     "return", "function",
     "on.exit" ## on.exit(expression, add=F) has two arguments in S-plus !
     ),
     language = c("$", "$<-", "<-", "<<-", "[", "[<-", "[[", "[[<-"),
     arith = c("%%", "%*%", "%/%","*", "+", "-", "/", "^"),
     logic = c("!",  "&", "&&",  "|", "||",
     "<", "<=", "==", ">", ">=", "!="),
     arithF =
     c("sign", "abs",
       "floor", "ceiling", "trunc",
       "sqrt",
       "exp",   ## NOT: "log",
       "cos",     "sin",  "tan",
       "acos",   "asin", "atan", ## Not:  atan2
       "cosh",   "sinh", "tanh",
       "acosh","asinh","atanh",
       "cumsum","cumprod",
       "cummax", "cummin"
       ),
     arithC = c("Arg", "Conj", "Im", "Mod", "Re"),

     programming =
     c("nargs", "missing", # actually args(.) could be as formal(.)
       "interactive",
       ".Primitive", ".Internal", ".External", ".Call",
       ".C", ".Fortran", "symbol.C", "symbol.For",
       "globalenv", "pos.to.env", "unclass",

       ##maybe ? "gc", "gcinfo",
       ##
       "debug", "undebug", "trace", "untrace",
       "browser",  "proc.time", "gc.time", #"traceback",
       ),

     language2= c(":", "~", "c", "list", #nomore (Sep.9,1998): "unlist",
     ".Alias",
     "call", "as.call", "expression", "substitute",
     "UseMethod", ## ? really ?
     "invisible",
     ),

     language3=
     c("environment<-",
       "length",    "length<-",
       "class", "class<-",
       ## "attr", not anymore [Summer '98]
       "attr<-",
       "attributes",    "attributes<-",
       "dim",       "dim<-",
       "dimnames",  "dimnames<-",
       ## MM:   "comment", "comment<-",
       ## New data.frame code
       ##      "levels", "levels<-",
       ##      "codes",  "codes<-",
       ##      "[.data.frame",  "[<-.data.frame",
       ##      "[[.data.frame", "[[<-.data.frame"
       ),
     )
real.primitives <- unlist(Real.primitives)
##names(real.primitives) <- rep("",length(real.primitives))

!any(duplicated(real.primitives)) # TRUE
all(real.primitives %in% Primf)   # TRUE

"%w/o%" <- function(a,b)  a[! a %in% b]  ## a without b

prim.f <- Primf %w/o% real.primitives
## see below: contains the is.xxxx(.) funtions
length(prim.f) == length(Primf) - length(real.primitives)# TRUE

Specf <- Primf[iPsp <- sapply(Primf, function(N) is.special(get(N, pos=bpos)))]
length(Specf) ## 36 [ R 0.63 ]
Specf
## the non-"special" ones:
all("builtin" == sapply(Primf[!iPsp], function(N) typeof(get(N, pos=bpos))))


ncpf <- nchar(prim.f)
table(ncpf)
prim.f[ncpf <= 6]#  only is.na, is.nan

( prim.isf <- prim.f[p.isis <- substr(prim.f,1,2) == "is"] )

length(prim.f2 <- prim.f[! p.isis]) # down to 87   [R 0.62.0, March 25, 1998]
                    # 61  [March 27]
                    # 43  [April 17];  38 [April 22]
##-> 0  [May 1, 1998]

prim.f2 # character(0) --- none left! --

for(n in prim.f2)
    cat(n," <- function(*) .Internal(",n,"(*))\n", sep="")