Hello,
I created an S3 "type" w/c is actually a list that should look like a
matrix but whose data is actually in an external file. The SEXP just
contains info on how to retrieve the data from the file. When I get to
the part of creating the SEXP, I found out that SET_DIM & SET_DIMNAME
checks the SEXP if the length matches (somewhere in src/main/attrib.c,
dimgets & dimnamegets IIRC (it's on my other partition. life sucks)).
After a quick look at the R code, I tried to bypass them by doing:
static void _installAttrib(SEXP obj, SEXP name, SEXP value) {
/* to bypass dim & dimnames property checking */
SEXP attr, cur_attr;
PROTECT(attr = NEW_LIST(1));
SETCAR(attr, value);
SET_TAG(attr, name);
if (ATTRIB(obj) == R_NilValue) SET_ATTRIB(obj, attr);
else {
cur_attr = nthcdr(ATTRIB(obj), length(ATTRIB(obj)) - 1);
SETCDR(cur_attr, attr);
}
UNPROTECT(1);
}
but it crashes R. Is there any other way to do this other than copying
those code in R that was not included in the API ?
Thanks,
M. Manese
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