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MERGE <- function (x, y, by = intersect(names(x), names(y)), by.x = by, | |
by.y = by, all = FALSE, all.x = all, all.y = all, sort = TRUE, | |
suffixes = c(".x", ".y"), incomparables = NULL, ...) | |
{ | |
fix.by <- function(by, df) { | |
if (is.null(by)) | |
by <- numeric() | |
by <- as.vector(by) | |
nc <- ncol(df) | |
if (is.character(by)) { | |
poss <- c("row.names", names(df)) | |
if (any(!charmatch(by, poss, 0L))) | |
stop("'by' must specify uniquely valid column(s)") | |
by <- match(by, poss) - 1L | |
} | |
else if (is.numeric(by)) { | |
if (any(by < 0L) || any(by > nc)) | |
stop("'by' must match numbers of columns") | |
} | |
else if (is.logical(by)) { | |
if (length(by) != nc) | |
stop("'by' must match number of columns") | |
by <- seq_along(by)[by] | |
} | |
else stop("'by' must specify column(s) as numbers, names or logical") | |
if (any(is.na(by))) | |
stop("'by' must specify valid column(s)") | |
unique(by) | |
} | |
nx <- nrow(x <- as.data.frame(x)) | |
ny <- nrow(y <- as.data.frame(y)) | |
by.x <- fix.by(by.x, x) | |
by.y <- fix.by(by.y, y) | |
if ((l.b <- length(by.x)) != length(by.y)) | |
stop("'by.x' and 'by.y' specify different numbers of columns") | |
if (l.b == 0L) { | |
nm <- nm.x <- names(x) | |
nm.y <- names(y) | |
has.common.nms <- any(cnm <- nm.x %in% nm.y) | |
if (has.common.nms) { | |
names(x)[cnm] <- paste0(nm.x[cnm], suffixes[1L]) | |
cnm <- nm.y %in% nm | |
names(y)[cnm] <- paste0(nm.y[cnm], suffixes[2L]) | |
} | |
if (nx == 0L || ny == 0L) { | |
res <- cbind(x[FALSE, ], y[FALSE, ]) | |
} | |
else { | |
ij <- expand.grid(seq_len(nx), seq_len(ny)) | |
res <- cbind(x[ij[, 1L], , drop = FALSE], y[ij[, | |
2L], , drop = FALSE]) | |
} | |
} | |
else { | |
if (any(by.x == 0L)) { | |
x <- cbind(Row.names = I(row.names(x)), x) | |
by.x <- by.x + 1L | |
} | |
if (any(by.y == 0L)) { | |
y <- cbind(Row.names = I(row.names(y)), y) | |
by.y <- by.y + 1L | |
} | |
# row.names(x) <- NULL | |
# row.names(y) <- NULL | |
if (l.b == 1L) { | |
bx <- x[, by.x] | |
if (is.factor(bx)) | |
bx <- as.character(bx) | |
by <- y[, by.y] | |
if (is.factor(by)) | |
by <- as.character(by) | |
} | |
else { | |
bx <- x[, by.x, drop = FALSE] | |
by <- y[, by.y, drop = FALSE] | |
names(bx) <- names(by) <- paste0("V", seq_len(ncol(bx))) | |
bz <- do.call("paste", c(rbind(bx, by), sep = "\r")) | |
bx <- bz[seq_len(nx)] | |
by <- bz[nx + seq_len(ny)] | |
} | |
comm <- match(bx, by, 0L) | |
bxy <- bx[comm > 0L] | |
xinds <- match(bx, bxy, 0L, incomparables) | |
yinds <- match(by, bxy, 0L, incomparables) | |
if (nx > 0L && ny > 0L) | |
m <- .Internal(merge(xinds, yinds, all.x, all.y)) | |
else m <- list(xi = integer(), yi = integer(), x.alone = seq_len(nx), | |
y.alone = seq_len(ny)) | |
nm <- nm.x <- names(x)[-by.x] | |
nm.by <- names(x)[by.x] | |
nm.y <- names(y)[-by.y] | |
ncx <- ncol(x) | |
if (all.x) | |
all.x <- (nxx <- length(m$x.alone)) > 0L | |
if (all.y) | |
all.y <- (nyy <- length(m$y.alone)) > 0L | |
lxy <- length(m$xi) | |
has.common.nms <- any(cnm <- nm.x %in% nm.y) | |
if (has.common.nms && nzchar(suffixes[1L])) | |
nm.x[cnm] <- paste0(nm.x[cnm], suffixes[1L]) | |
x <- x[c(m$xi, if (all.x) m$x.alone), c(by.x, seq_len(ncx)[-by.x]), | |
drop = FALSE] | |
names(x) <- c(nm.by, nm.x) | |
if (all.y) { | |
ya <- y[m$y.alone, by.y, drop = FALSE] | |
names(ya) <- nm.by | |
ya <- cbind(ya, x[rep.int(NA_integer_, nyy), nm.x, | |
drop = FALSE]) | |
x <- rbind(x, ya) | |
} | |
if (has.common.nms && nzchar(suffixes[2L])) { | |
cnm <- nm.y %in% nm | |
nm.y[cnm] <- paste0(nm.y[cnm], suffixes[2L]) | |
} | |
y <- y[c(m$yi, if (all.x) rep.int(1L, nxx), if (all.y) m$y.alone), | |
-by.y, drop = FALSE] | |
if (all.x) { | |
zap <- (lxy + 1L):(lxy + nxx) | |
for (i in seq_along(y)) { | |
if (is.matrix(y[[1]])) | |
y[[1]][zap, ] <- NA | |
else is.na(y[[i]]) <- zap | |
} | |
} | |
if (has.common.nms) | |
names(y) <- nm.y | |
nm <- c(names(x), names(y)) | |
if (any(d <- duplicated(nm))) | |
if (sum(d) > 1L) | |
warning("column names ", paste(sQuote(nm[d]), | |
collapse = ", "), " are duplicated in the result", | |
domain = NA) | |
else warning("column name ", sQuote(nm[d]), " is duplicated in the result", | |
domain = NA) | |
res <- cbind(x, y) | |
if (sort) | |
res <- res[if (all.x || all.y) | |
do.call("order", x[, seq_len(l.b), drop = FALSE]) | |
else sort.list(bx[m$xi]), , drop = FALSE] | |
} | |
# attr(res, "row.names") <- .set_row_names(nrow(res)) | |
res | |
} |
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