R Under development (unstable) (2023-12-09 r85665 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> library("matrixStats")
> 
> rowCollapse_R <- function(x, idxs, ..., useNames = NA) {
+   ans <- c()
+   storage.mode(ans) <- storage.mode(x)
+   for (ii in seq_len(length(idxs))) {
+     ans[ii] <- x[ii, idxs[ii]]
+   }
+   
+   # Preserve names attribute
+   if (isTRUE(useNames)) {
+     names <- rownames(x)
+     if (!is.null(names)) names(ans) <- names
+   }
+ 
+   ans
+ }
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Subsetted tests
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> source("utils/validateIndicesFramework.R")
> x <- matrix(runif(6 * 6, min = -6, max = 6), nrow = 6, ncol = 6)
> storage.mode(x) <- "integer"
> 
> # To check names attribute
> dimnames <- list(letters[1:6], LETTERS[1:6])
> 
> for (rows in index_cases) {
+   if (is.null(rows)) rows <- seq_len(nrow(x))
+ 
+   for (idxs in list(2L, seq_len(6L))) {
+     for (useNames in c(if (!matrixStats:::isUseNamesNADefunct()) NA, TRUE, FALSE)) {
+       suppressWarnings({
+         actual <- tryCatch(rowCollapse(x, idxs, rows = rows, useNames = useNames),
+                            error = function(c) "error")
+         expect <- tryCatch({
+           idxs_0 <- rep(idxs, length.out = nrow(x))[rows]
+           rowCollapse_R(x[rows, , drop = FALSE], idxs_0, useNames = useNames)
+         }, error = function(c) "error")
+       })
+       stopifnot(all.equal(actual, expect))
+     
+       suppressWarnings({
+         actual <- tryCatch(colCollapse(t(x), idxs, cols = rows, useNames = useNames),
+                            error = function(c) "error")
+       })
+       stopifnot(all.equal(actual, expect))
+       
+       # Check names attribute
+       dimnames(x) <- dimnames
+       suppressWarnings({
+         actual <- tryCatch(rowCollapse(x, idxs, rows = rows, useNames = useNames),
+                            error = function(c) "error")
+         expect <- tryCatch({
+           idxs_0 <- rep(idxs, length.out = nrow(x))[rows]
+           rowCollapse_R(x[rows, , drop = FALSE], idxs_0, useNames = useNames)
+         }, error = function(c) "error")
+       })
+       stopifnot(all.equal(actual, expect))
+       
+       suppressWarnings({
+         actual <- tryCatch(colCollapse(t(x), idxs, cols = rows, useNames = useNames),
+                            error = function(c) "error")
+       })
+       stopifnot(all.equal(actual, expect))
+       
+       dimnames(x) <- NULL
+     }
+   }
+ }
> 
> proc.time()
   user  system elapsed 
   0.23    0.01    0.25