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Highlights cells, such as the maxima in each column or row, of an 'xtable' in R
## 2010-06-25
## (c) Felix Andrews <felix@nfrac.org>
## GPL-2
## If 'which' is given it should be a logical matrix specifying bold cells.
## Otherwise: in each column or row with numeric data, the maximum or minimum
## value is set bold; 'max' can have entries for each column/row, NA means skip.
## Examples:
## library(xtable)
## x <- tail(iris)
## printbold(xtable(x)) #each = "column"
## printbold(xtable(x), each = "column", max = c(F,NA,NA,T,NA))
## printbold(xtable(x), each = "row", max = FALSE)
## printbold(xtable(x), x >= 6.5, type = "html")
printbold <-
function(x, which = NULL, each = c("column", "row"), max = TRUE,
NA.string = "", type = c("latex", "html"),
sanitize.text.function = force,
sanitize.rownames.function = NULL,
sanitize.colnames.function = NULL, ...)
{
stopifnot(inherits(x, "xtable"))
each <- match.arg(each)
type <- match.arg(type)
digits <- rep(digits(x), length = ncol(x)+1)
if (!is.null(which)) {
stopifnot(nrow(which) == nrow(x))
stopifnot(ncol(which) == ncol(x))
boldmatrix <- which
} else {
boldmatrix <- matrix(FALSE, ncol = ncol(x), nrow = nrow(x))
## round values before calculating max/min to avoid trivial diffs
for (i in 1:ncol(x)) {
if (!is.numeric(x[,i])) next
x[,i] <- round(x[,i], digits = digits[i+1])
}
if (each == "column") {
max <- rep(max, length = ncol(x))
for (i in 1:ncol(x)) {
xi <- x[,i]
if (!is.numeric(xi)) next
if (is.na(max[i])) next
imax <- max(xi, na.rm = TRUE)
if (!max[i])
imax <- min(xi, na.rm = TRUE)
boldmatrix[xi == imax, i] <- TRUE
}
} else if (each == "row") {
max <- rep(max, length = nrow(x))
for (i in 1:nrow(x)) {
xi <- x[i,]
ok <- sapply(xi, is.numeric)
if (!any(ok)) next
if (is.na(max[i])) next
imax <- max(unlist(xi[ok]), na.rm = TRUE)
if (!max[i])
imax <- min(unlist(xi[ok]), na.rm = TRUE)
whichmax <- sapply(xi, identical, imax)
boldmatrix[i, whichmax] <- TRUE
}
}
}
## need to convert to character
## only support per-column formats, not cell formats
display <- rep(display(x), length = ncol(x)+1)
for (i in 1:ncol(x)) {
if (!is.numeric(x[,i])) next
ina <- is.na(x[,i])
x[,i] <- formatC(x[,i], digits = digits[i+1],
format = display[i+1])
x[ina, i] <- NA.string
display(x)[i+1] <- "s"
## embolden
yes <- boldmatrix[,i]
if (type == "latex") {
x[yes,i] <- paste("\\textbf{", x[yes,i], "}", sep = "")
} else {
x[yes,i] <- paste("<strong>", x[yes,i], "</strong>", sep = "")
}
}
print(x, ..., type = type, NA.string = NA.string,
sanitize.text.function = sanitize.text.function,
sanitize.rownames.function = sanitize.rownames.function,
sanitize.colnames.function = sanitize.colnames.function)
}
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