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")
> 
> rowDiffs_R <- function(x, lag = 1L, differences = 1L, ..., useNames = NA) {
+   ncol2 <- ncol(x) - lag * differences
+   if (ncol2 <= 0) {
+     y <- matrix(x[integer(0L)], nrow = nrow(x), ncol = 0L)
+     # Preserve names attribute
+     if (isTRUE(useNames) && !is.null(rownames(x))) rownames(y) <- rownames(x)
+     return(y)
+   }
+   suppressWarnings({
+     y <- apply(x, MARGIN = 1L, FUN = diff, lag = lag, differences = differences)
+   })
+   y <- t(y)
+   
+   # Preserve dimnames attribute
+   dim(y) <- c(nrow(x), ncol2)
+   if (isTRUE(useNames) && !is.null(dimnames(x))) {
+     colnames <- colnames(x)
+     if (!is.null(colnames)) {
+       len <- length(colnames)
+       colnames <- colnames[(len - ncol2 + 1):len]
+     }
+     dimnames(y) <- list(rownames(x), colnames)      
+   }
+   else dimnames(y) <- NULL
+   
+   y
+ }
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # 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 dimnames attribute
> dimnames <- list(letters[1:6], LETTERS[1:6])
> 
> # 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
+       for (lag in 1:2) {
+         for (differences in 1:3) {
+           # Check dimnames attribute
+           useNames <- c(if (!matrixStats:::isUseNamesNADefunct()) NA, TRUE, FALSE)
+           useNames <- useNames[count %% length(useNames) + 1]
+           validateIndicesTestMatrix(x, rows, cols,
+                                     ftest = rowDiffs, fsure = rowDiffs_R,
+                                     lag = lag, differences = differences, useNames = useNames)
+           validateIndicesTestMatrix(x, rows, cols,
+                                     ftest = function(x, rows, cols, ..., useNames) {
+             t(colDiffs(t(x), rows = cols, cols = rows, ..., useNames = useNames))
+                                     }, fsure = rowDiffs_R,
+                                     lag = lag, differences = differences, useNames = useNames)
+         }
+       }
+     }
+   }
+ }
> 
> proc.time()
   user  system elapsed 
   2.25    0.06    2.31