It's tough to reliably reproduce, but I often get stack imbalance warnings
when calling max.col() on non-real/double matrix. The code is conditionally
PROTECTing but not incrementing its nprot counter for the eventual
UNPROTECT. Pretty sure this would fix (but I haven't tested it):
Index: array.c
===================================================================
--- array.c (revision 61606)
+++ array.c (working copy)
@@ -1614,7 +1614,10 @@
SEXP m = CAR(args);
int method = asInteger(CADR(args));
int nr = nrows(m), nc = ncols(m), nprot = 1;
- if (TYPEOF(m) != REALSXP) PROTECT(m = coerceVector(m, REALSXP));
+ if (TYPEOF(m) != REALSXP) {
+ PROTECT(m = coerceVector(m, REALSXP));
+ nprot++;
+ }
SEXP ans = allocVector(INTSXP, nr);
PROTECT(ans);
R_max_col(REAL(m), &nr, &nc, INTEGER(ans), &method);
Thanks,
Michael
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