If an expression is passed to stopifnot() which contains missing values,
then the resulting error message is somewhat baffling until you are used
to it, e.g.
> x <- y <- rep(TRUE, 10)
> y[7] <- NA
> stopifnot(x, y)
Error in if (!(is.logical(r <- eval(ll[[i]])) && all(r)))
stop(paste(deparse(mc[[i + :
missing value where TRUE/FALSE needed
A minor change to stopifnot() produces the following behaviour:
> stopifnot(x, y)
Error in stopifnot(x, y) : y contains missing values
My attempt at a suitable modification follows, and below that the original
function definition. Is a change along these lines appropriate?
## Altered version
stopifnot <- function (...) {
n <- length(ll <- list(...))
if (n == 0)
return(invisible())
mc <- match.call()
for (i in 1:n) {
if(any(is.na(r <- eval(ll[[i]])))) stop(paste(deparse(mc[[i + 1]])), "
contains missing values")
if (!(is.logical(r) && all(r)))
stop(paste(deparse(mc[[i + 1]]), "is not TRUE"), call. = FALSE)
}
}
## from R-2.1.1/src/library/base/R/stop.R
stopifnot <- function(...)
{
n <- length(ll <- list(...))
if(n == 0)
return(invisible())
mc <- match.call()
for(i in 1:n)
if(!(is.logical(r <- eval(ll[[i]])) && all(r)))
stop(paste(deparse(mc[[i+1]]), "is not TRUE"), call. = FALSE)
}
Thanks,
Dan
> version
_
platform i386-pc-linux-gnu
arch i386
os linux-gnu
system i386, linux-gnu
status
major 2
minor 2.0
year 2005
month 10
day 06
svn rev 35749
language R
----------
Dan Davison
Committee on Evolutionary Biology
University of Chicago, U.S.A.
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