R Under development (unstable) (2023-12-09 r85665 ucrt) -- "Unsuffered Consequences"
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> library("matrixStats")
> 
> ## Create isFALSE() if running on an old version of R
> if (!exists("isFALSE", mode="function")) {
+   isFALSE <- function(x) is.logical(x) && length(x) == 1L && !is.na(x) && !x
+ }
> 
> rowQuantiles_R <- function(x, probs, na.rm = FALSE, drop = TRUE, ..., useNames = NA) {
+   q <- apply(x, MARGIN = 1L, FUN = function(x, probs, na.rm) {
+     if (!na.rm && any(is.na(x))) {
+       na_value <- NA_real_
+       storage.mode(na_value) <- storage.mode(x)
+       rep(na_value, times = length(probs))
+ 
+     } else {
+       as.vector(quantile(x, probs = probs, na.rm = na.rm, names = FALSE, ...))
+     }
+   }, probs = probs, na.rm = na.rm)
+ 
+   if (!is.null(dim(q))) q <- t(q)
+   else dim(q) <- c(nrow(x), length(probs))
+ 
+   colnames(q) <- matrixStats:::quantile_probs_names(probs)
+   rownames(q) <- rownames(x)
+   if (isFALSE(useNames)) dimnames(q) <- NULL
+ 
+   if (drop) q <- drop(q)
+   q
+ }
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Subsetted tests
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> source("utils/validateIndicesFramework.R")
> x <- matrix(runif(6 * 6, min = -6, max = 6), nrow = 6, ncol = 6)
> dimnames <- lapply(dim(x), FUN = function(n) letters[seq_len(n)])
> probs <- c(0, 0.25, 0.75, 1)
> # Test with and without dimnames on x
> for (setDimnames in c(TRUE, FALSE)) {
+   if (setDimnames) dimnames(x) <- dimnames
+   else dimnames(x) <- NULL
+   
+   count <- 0L
+   for (rows in index_cases) {
+     for (cols in index_cases) {
+       count <- count + 1L
+       na.rm <- c(TRUE, FALSE)[count %% 2 + 1]
+       useNames <- c(if (!matrixStats:::isUseNamesNADefunct()) NA, TRUE, FALSE)
+       useNames <- useNames[count %% length(useNames) + 1]
+ 
+       validateIndicesTestMatrix(x, rows, cols,
+                                 ftest = rowQuantiles, fsure = rowQuantiles_R,
+                                 probs = probs, na.rm = na.rm, drop = FALSE, useNames = useNames)
+       validateIndicesTestMatrix(x, rows, cols,
+                                 fcoltest = colQuantiles, fsure = rowQuantiles_R,
+                                 probs = probs, na.rm = na.rm, drop = FALSE, useNames = useNames)
+     }
+   }
+ }
> 
> 
> proc.time()
   user  system elapsed 
   1.18    0.12    1.26