In an R session, I see the following, which means that findInterval is
an R function.
> findInterval
function (x, vec, rightmost.closed = FALSE, all.inside = FALSE)
{
if (any(is.na(vec)))
stop("'vec' contains NAs")
if (is.unsorted(vec))
stop("'vec' must be sorted non-decreasingly")
if (has.na <- any(ix <- is.na(x)))
x <- x[!ix]
nx <- length(x)
index <- integer(nx)
.C("find_interv_vec", xt = as.double(vec), n = length(vec),
x = as.double(x), nx = nx, as.logical(rightmost.closed),
as.logical(all.inside), index, DUP = FALSE, NAOK = TRUE,
PACKAGE = "base")
if (has.na) {
ii <- as.integer(ix)
ii[ix] <- NA
ii[!ix] <- index
ii
}
else index
}
<environment: namespace:base>
However, I also see a C function with the same name in
src/appl/interv.c. I'm wondering where is this use?
int findInterval(double *xt, int n, double x,
Rboolean rightmost_closed, Rboolean all_inside, int ilo,
int *mflag)
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