Dear Gabor:
Does the following answer your question:
> tst <- list(a=1, b=2)
> tst[numeric(0)]
list()
> tst[[numeric(0)]]
Error in tst[[numeric(0)]] : attempt to select less than one element
Spencer
Gabor Grothendieck wrote:
In the code below test2() gives an error message:
Error in .subset2(x, i, exact = exact) :
attempt to select less than one element
even though test(), which is nearly the same, gives
the expected result. BOD is a data set that comes
with R. Is this a bug?
idx <- 2
# returns expected result
test <- function(pf = parent.frame()) .subset2(BOD, pf$idx)
test()
# gives error message !!!
test2 <- function(pf = parent.frame()) BOD[[pf$idx]]
test2()
I tried this on Windows Vista under:
R.version.string
[1] "R version 2.7.1 RC (2008-06-16 r45949)"
and
R.version.string
[1] "R version 2.8.0 Under development (unstable) (2008-06-28 r46012)"
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