[Rd] Problem with "missing" in "local" (PR#1241)

J.C.Rougier@durham.ac.uk J.C.Rougier@durham.ac.uk
Fri, 4 Jan 2002 14:41:57 +0100 (MET)

Hi everyone,

I encountered unexpected behaviour when calling "missing" within a
"local" environment, namely

fred <- function(x, y)
  x <- as.vector(x)
    dontwantme <- 1:100
    if (missing(y)) print("No \"y\" today")

whereupon I get

> fred(1:10)
Error in eval(expr, envir, enclos) : "missing" illegal use of missing

I think it is reasonable to expect missing to work in this context (I
suspect the problem relates to lazy evaluation): if not, it might be
helpful to amend the help file.

Cheers, Jonathan.

--please do not edit the information below--

 platform = i686-pc-linux-gnu
 arch = i686
 os = linux-gnu
 system = i686, linux-gnu
 status = 
 major = 1
 minor = 4.0
 year = 2001
 month = 12
 day = 19
 language = R

Search Path:
 .GlobalEnv, Autoloads, package:base

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