Examples for 'base::call'

### ** Examples

is.call(call) #-> FALSE: Functions are NOT calls

## set up a function call to round with argument 10.5
cl <- call("round", 10.5)
is.call(cl) # TRUE

cl

identical(quote(round(10.5)), # <- less functional, but the same
          cl) # TRUE

## such a call can also be evaluated.
eval(cl) # [1] 10

class(cl) # "call"

typeof(cl)# "language"

is.call(cl) && is.language(cl) # always TRUE for "call"s

A <- 10.5
call("round", A)        # round(10.5)

call("round", quote(A)) # round(A)

f <- "round"
call(f, quote(A))       # round(A)

## if we want to supply a function we need to use as.call or similar
f <- round
## Not run: call(f, quote(A))  # error: first arg must be character
(g <- as.call(list(f, quote(A))))

eval(g)

## alternatively but less transparently
g <- list(f, quote(A))
mode(g) <- "call"
g

eval(g)

## see also the examples in the help for do.call