On 19/04/2008 1:18 PM, Søren Højsgaard wrote:
> Dear List
> On windows XP using R.2.6.2 I get the message
>
> Error: value of 'SET_CXTAIL' must be a char or NULL, not a 'char'
>
> in connection with calling C code (using the .Call interface). I have been
> unable to find any info on this (in Writing R extensions). Can anyone help me
> with understanding this error? (In case it helps in tracking the problem: I
> pass two matrices and a list of several matrices to my C function).
The code that produces that error message is in memory.c:
#ifdef USE_ATTRIB_FIELD_FOR_CHARSXP_CACHE_CHAINS
SEXP (SET_CXTAIL)(SEXP x, SEXP v) {
#ifdef USE_TYPE_CHECKING
if(TYPEOF(v) != CHARSXP && TYPEOF(v) != NILSXP)
error("value of 'SET_CXTAIL' must be a char or NULL, not a '%s'",
type2char(TYPEOF(x)));
#endif
/*CHECK_OLD_TO_NEW(x, v); *//* not needed since not properly traced */
ATTRIB(x) = v;
return x;
}
#endif /* USE_ATTRIB_FIELD_FOR_CHARSXP_CACHE_CHAINS */
so it looks as though the error message is a little buggy (it should
print TYPEOF(v), not TYPEOF(x), or maybe it should test x, not v.) But
I don't really know what it's doing. Are you using a STRSXP somewhere
that is expecting a CHARSXP?
Duncan Murdoch
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