Full_Name: Wolfgang Huber
Version: R-devel_2005-03-10
OS: alphaev68-dec-osf4.0f
Submission from: (NULL) (62.253.128.15)
This report concerns allocation of large (>2^31 byte) chunks of memory with
R_alloc. I suspect it is a bug/typo but please don't hate me if it's actually a
feature:
In R, I can happily create large matrices:
> a= matrix(0, nrow=191481, ncol=3063)
> dim(a)
[1] 191481 3063
> length(a)*8 / 2^30
[1] 4.369812
but when I call R_alloc in some of my C code, I get
"negative length vectors are not allowed":
maxcp = 3063; n = 191481;
vs = (long) maxcp * (long) n;
mI = (double*) R_alloc(vs, sizeof(double));
I suspect this caused by allocString(int), which is called by R_alloc, see
below. Would it be possible to have allocString take a long argument as well?
These code excerpts are from R-devel_2005-03-10.tar.gz:
char *R_alloc(long nelem, int eltsize) {
R_size_t size = nelem * eltsize;
SEXP s = allocString(size);
...
}
SEXP allocString(int length) {
return allocVector(CHARSXP, length);
}
SEXP allocVector(SEXPTYPE type, R_len_t length) {
...
case CHARSXP:
size = BYTE2VEC(length + 1);
...
malloc(sizeof(SEXPREC_ALIGN) + size * sizeof(VECREC)))
...
}
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