Rubbish values written with zero-length vectors (PR#14217)
Confirmed behavior on R version 2.10.1 Patched (2010-01-12 r50990) and R version 2.11.0 Under development (unstable) (2010-02-14 r51138) [Windows Vista]: INTEGERS:
v <- integer(5) v
[1] 0 0 0 0 0
v[[2]] <- integer(0) v
[1] 0 2892960 0 0 0
v[[4]] <- 1L[c()] v
[1] 0 2892960 0 2892960 0
str(v)
int [1:5] 0 2892960 0 2892960 0 DOUBLES:
u <- integer(5) u
[1] 0 0 0 0 0
u[[2]] <- integer(0) u
[1] 0 2892960 0 0 0
u[[4]] <- 1L[c()] u
[1] 0 2892960 0 2892960 0
str(u)
str [1:5] 0 2892960 0 2892960 0
u[[5]] <- double(0) u
[1] 0.000000e+00 3.487453e+07 0.000000e+00 3.487453e+07 4.261222e-314
str(u)
num [1:5] 0.00 3.49e+07 0.00 3.49e+07 4.26e-314 The actual "rubbish" values are the same within each R session, but differ between R sessions. Certain looks like stray memory cells are assigned. Wanted behavior should probably be:
u[[5]] <- double(0)
Error in u[[5]] <- double(0) : replacement has length zero cf. u[5] <- double(0) and
u[[5]] <- double(5)
Error in u[[5]] <- double(5) : more elements supplied than there are to replace /Henrik
On Fri, Feb 19, 2010 at 1:45 PM, <g.russell at eos-solutions.com> wrote:
Full_Name: George Russell Version: 2.10.0, 2.11.0 (2009-12-13 r50716) OS: Windows Submission from: (NULL) (217.111.3.131) R trace: -- cut here --
v <- integer(0) v[[1]] <- v v
[1] 20522144
v <- numeric(0) v[[1]] <- v v
[1] 4.254131e-314
sessionInfo()
R version 2.10.0 (2009-10-26) i386-pc-mingw32 locale: [1] LC_COLLATE=German_Germany.1252 ?LC_CTYPE=German_Germany.1252 [3] LC_MONETARY=German_Germany.1252 LC_NUMERIC=C [5] LC_TIME=German_Germany.1252 attached base packages: [1] stats ? ? graphics ?grDevices datasets ?utils ? ? methods ? base -- cut here -- Clearly the assignments v[[1]] <- v do not do anything useful, the problem is I don't understand where the strange values left in v come from. The same problem occurs with the 2.11.0 release r50716 and --vanilla. For vanilla in Windows CMD mode I get different values in v, but ones which are to me equally strange. Many thanks for your help! George Russell
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