R version 4.4.0 beta (2024-04-09 r86391 ucrt) -- "Puppy Cup"
Copyright (C) 2024 The R Foundation for Statistical Computing
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
+ }
> 
> 
> set.seed(0x42)
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # With and without some NAs
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> for (mode in c("integer", "double")) {
+   cat("mode: ", mode, "\n", sep = "")
+ 
+   for (add_na in c(FALSE, TRUE)) {
+     cat("add_na = ", add_na, "\n", sep = "")
+ 
+     x <- matrix(sample(10 * 8) + 0.1, nrow = 10L, ncol = 8L)
+     if (add_na) {
+       x[3:7, c(2, 4)] <- NA_real_
+     }
+     storage.mode(x) <- mode
+     str(x)
+     
+     dimnames <- list(letters[1:10], LETTERS[1:8])
+ 
+     # Test with and without dimnames on x
+     for (setDimnames in c(TRUE, FALSE)) {
+       if (setDimnames) dimnames(x) <- dimnames
+       else dimnames(x) <- NULL
+       # Check dimnames attribute
+       for (useNames in c(if (!matrixStats:::isUseNamesNADefunct()) NA, TRUE, FALSE)) {
+         for (lag in 1:4) {
+           for (differences in 1:3) {
+             cat(sprintf("mode: %s, lag = %d, differences = %d\n",
+                         mode, lag, differences))
+             # Row/column ranges
+             r0 <- rowDiffs_R(x, lag = lag, differences = differences, useNames = useNames)
+             r1 <- rowDiffs(x, lag = lag, differences = differences, useNames = useNames)
+             r2 <- t(colDiffs(t(x), lag = lag, differences = differences, useNames = useNames))
+             stopifnot(all.equal(r1, r0))
+             stopifnot(all.equal(r2, r0))
+             stopifnot(all.equal(r1, r2))
+           }
+         }
+       } # for (useNames ...)
+     } # for (setDimnames ...)
+   } # for (add_na ...)
+ } # for (mode ...)
mode: integer
add_na = FALSE
 int [1:10, 1:8] 68 26 29 47 48 10 1 38 16 40 ...
mode: integer, lag = 1, differences = 1
mode: integer, lag = 1, differences = 2
mode: integer, lag = 1, differences = 3
mode: integer, lag = 2, differences = 1
mode: integer, lag = 2, differences = 2
mode: integer, lag = 2, differences = 3
mode: integer, lag = 3, differences = 1
mode: integer, lag = 3, differences = 2
mode: integer, lag = 3, differences = 3
mode: integer, lag = 4, differences = 1
mode: integer, lag = 4, differences = 2
mode: integer, lag = 4, differences = 3
mode: integer, lag = 1, differences = 1
mode: integer, lag = 1, differences = 2
mode: integer, lag = 1, differences = 3
mode: integer, lag = 2, differences = 1
mode: integer, lag = 2, differences = 2
mode: integer, lag = 2, differences = 3
mode: integer, lag = 3, differences = 1
mode: integer, lag = 3, differences = 2
mode: integer, lag = 3, differences = 3
mode: integer, lag = 4, differences = 1
mode: integer, lag = 4, differences = 2
mode: integer, lag = 4, differences = 3
mode: integer, lag = 1, differences = 1
mode: integer, lag = 1, differences = 2
mode: integer, lag = 1, differences = 3
mode: integer, lag = 2, differences = 1
mode: integer, lag = 2, differences = 2
mode: integer, lag = 2, differences = 3
mode: integer, lag = 3, differences = 1
mode: integer, lag = 3, differences = 2
mode: integer, lag = 3, differences = 3
mode: integer, lag = 4, differences = 1
mode: integer, lag = 4, differences = 2
mode: integer, lag = 4, differences = 3
mode: integer, lag = 1, differences = 1
mode: integer, lag = 1, differences = 2
mode: integer, lag = 1, differences = 3
mode: integer, lag = 2, differences = 1
mode: integer, lag = 2, differences = 2
mode: integer, lag = 2, differences = 3
mode: integer, lag = 3, differences = 1
mode: integer, lag = 3, differences = 2
mode: integer, lag = 3, differences = 3
mode: integer, lag = 4, differences = 1
mode: integer, lag = 4, differences = 2
mode: integer, lag = 4, differences = 3
add_na = TRUE
 int [1:10, 1:8] 80 71 7 52 79 22 31 10 29 63 ...
mode: integer, lag = 1, differences = 1
mode: integer, lag = 1, differences = 2
mode: integer, lag = 1, differences = 3
mode: integer, lag = 2, differences = 1
mode: integer, lag = 2, differences = 2
mode: integer, lag = 2, differences = 3
mode: integer, lag = 3, differences = 1
mode: integer, lag = 3, differences = 2
mode: integer, lag = 3, differences = 3
mode: integer, lag = 4, differences = 1
mode: integer, lag = 4, differences = 2
mode: integer, lag = 4, differences = 3
mode: integer, lag = 1, differences = 1
mode: integer, lag = 1, differences = 2
mode: integer, lag = 1, differences = 3
mode: integer, lag = 2, differences = 1
mode: integer, lag = 2, differences = 2
mode: integer, lag = 2, differences = 3
mode: integer, lag = 3, differences = 1
mode: integer, lag = 3, differences = 2
mode: integer, lag = 3, differences = 3
mode: integer, lag = 4, differences = 1
mode: integer, lag = 4, differences = 2
mode: integer, lag = 4, differences = 3
mode: integer, lag = 1, differences = 1
mode: integer, lag = 1, differences = 2
mode: integer, lag = 1, differences = 3
mode: integer, lag = 2, differences = 1
mode: integer, lag = 2, differences = 2
mode: integer, lag = 2, differences = 3
mode: integer, lag = 3, differences = 1
mode: integer, lag = 3, differences = 2
mode: integer, lag = 3, differences = 3
mode: integer, lag = 4, differences = 1
mode: integer, lag = 4, differences = 2
mode: integer, lag = 4, differences = 3
mode: integer, lag = 1, differences = 1
mode: integer, lag = 1, differences = 2
mode: integer, lag = 1, differences = 3
mode: integer, lag = 2, differences = 1
mode: integer, lag = 2, differences = 2
mode: integer, lag = 2, differences = 3
mode: integer, lag = 3, differences = 1
mode: integer, lag = 3, differences = 2
mode: integer, lag = 3, differences = 3
mode: integer, lag = 4, differences = 1
mode: integer, lag = 4, differences = 2
mode: integer, lag = 4, differences = 3
mode: double
add_na = FALSE
 num [1:10, 1:8] 36.1 15.1 27.1 63.1 62.1 58.1 28.1 19.1 41.1 3.1 ...
mode: double, lag = 1, differences = 1
mode: double, lag = 1, differences = 2
mode: double, lag = 1, differences = 3
mode: double, lag = 2, differences = 1
mode: double, lag = 2, differences = 2
mode: double, lag = 2, differences = 3
mode: double, lag = 3, differences = 1
mode: double, lag = 3, differences = 2
mode: double, lag = 3, differences = 3
mode: double, lag = 4, differences = 1
mode: double, lag = 4, differences = 2
mode: double, lag = 4, differences = 3
mode: double, lag = 1, differences = 1
mode: double, lag = 1, differences = 2
mode: double, lag = 1, differences = 3
mode: double, lag = 2, differences = 1
mode: double, lag = 2, differences = 2
mode: double, lag = 2, differences = 3
mode: double, lag = 3, differences = 1
mode: double, lag = 3, differences = 2
mode: double, lag = 3, differences = 3
mode: double, lag = 4, differences = 1
mode: double, lag = 4, differences = 2
mode: double, lag = 4, differences = 3
mode: double, lag = 1, differences = 1
mode: double, lag = 1, differences = 2
mode: double, lag = 1, differences = 3
mode: double, lag = 2, differences = 1
mode: double, lag = 2, differences = 2
mode: double, lag = 2, differences = 3
mode: double, lag = 3, differences = 1
mode: double, lag = 3, differences = 2
mode: double, lag = 3, differences = 3
mode: double, lag = 4, differences = 1
mode: double, lag = 4, differences = 2
mode: double, lag = 4, differences = 3
mode: double, lag = 1, differences = 1
mode: double, lag = 1, differences = 2
mode: double, lag = 1, differences = 3
mode: double, lag = 2, differences = 1
mode: double, lag = 2, differences = 2
mode: double, lag = 2, differences = 3
mode: double, lag = 3, differences = 1
mode: double, lag = 3, differences = 2
mode: double, lag = 3, differences = 3
mode: double, lag = 4, differences = 1
mode: double, lag = 4, differences = 2
mode: double, lag = 4, differences = 3
add_na = TRUE
 num [1:10, 1:8] 67.1 80.1 45.1 8.1 39.1 66.1 27.1 71.1 47.1 46.1 ...
mode: double, lag = 1, differences = 1
mode: double, lag = 1, differences = 2
mode: double, lag = 1, differences = 3
mode: double, lag = 2, differences = 1
mode: double, lag = 2, differences = 2
mode: double, lag = 2, differences = 3
mode: double, lag = 3, differences = 1
mode: double, lag = 3, differences = 2
mode: double, lag = 3, differences = 3
mode: double, lag = 4, differences = 1
mode: double, lag = 4, differences = 2
mode: double, lag = 4, differences = 3
mode: double, lag = 1, differences = 1
mode: double, lag = 1, differences = 2
mode: double, lag = 1, differences = 3
mode: double, lag = 2, differences = 1
mode: double, lag = 2, differences = 2
mode: double, lag = 2, differences = 3
mode: double, lag = 3, differences = 1
mode: double, lag = 3, differences = 2
mode: double, lag = 3, differences = 3
mode: double, lag = 4, differences = 1
mode: double, lag = 4, differences = 2
mode: double, lag = 4, differences = 3
mode: double, lag = 1, differences = 1
mode: double, lag = 1, differences = 2
mode: double, lag = 1, differences = 3
mode: double, lag = 2, differences = 1
mode: double, lag = 2, differences = 2
mode: double, lag = 2, differences = 3
mode: double, lag = 3, differences = 1
mode: double, lag = 3, differences = 2
mode: double, lag = 3, differences = 3
mode: double, lag = 4, differences = 1
mode: double, lag = 4, differences = 2
mode: double, lag = 4, differences = 3
mode: double, lag = 1, differences = 1
mode: double, lag = 1, differences = 2
mode: double, lag = 1, differences = 3
mode: double, lag = 2, differences = 1
mode: double, lag = 2, differences = 2
mode: double, lag = 2, differences = 3
mode: double, lag = 3, differences = 1
mode: double, lag = 3, differences = 2
mode: double, lag = 3, differences = 3
mode: double, lag = 4, differences = 1
mode: double, lag = 4, differences = 2
mode: double, lag = 4, differences = 3
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # All NAs
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> for (mode in c("integer", "double")) {
+   cat("mode: ", mode, "\n", sep = "")
+   x <- matrix(NA_real_, nrow = 10L, ncol = 5L)
+   storage.mode(x) <- mode
+   str(x)
+   
+   dimnames <- list(letters[1:10], LETTERS[1:5])
+   
+   # Test with and without dimnames on x
+   for (setDimnames in c(TRUE, FALSE)) {
+     if (setDimnames) dimnames(x) <- dimnames
+     else dimnames(x) <- NULL
+     # Check dimnames attribute
+     for (useNames in c(if (!matrixStats:::isUseNamesNADefunct()) NA, TRUE, FALSE)) {
+       r0 <- rowDiffs_R(x, useNames = useNames)
+       r1 <- rowDiffs(x, useNames = useNames)
+       r2 <- t(colDiffs(t(x), useNames = useNames))
+       stopifnot(all.equal(r1, r0))
+       stopifnot(all.equal(r2, r0))
+       stopifnot(all.equal(r1, r2))
+     } # for (useNames ...)
+   } # for (setDimnames ...)
+ } # for (mode ...)
mode: integer
 int [1:10, 1:5] NA NA NA NA NA NA NA NA NA NA ...
mode: double
 num [1:10, 1:5] NA NA NA NA NA NA NA NA NA NA ...
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # A 1x1 matrix
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> x <- matrix(0, nrow = 1L, ncol = 1L)
> dimnames <- list("a", "A")
> # Test with and without dimnames on x
> for (setDimnames in c(TRUE, FALSE)) {
+   if (setDimnames) dimnames(x) <- dimnames
+   else dimnames(x) <- NULL
+   # Check dimnames attribute
+   for (useNames in c(if (!matrixStats:::isUseNamesNADefunct()) NA, TRUE, FALSE)) {
+     r0 <- rowDiffs_R(x, useNames = useNames)
+     r1 <- rowDiffs(x, useNames = useNames)
+     r2 <- t(colDiffs(t(x), useNames = useNames))
+     stopifnot(all.equal(r1, r0))
+     stopifnot(all.equal(r2, r0))
+     stopifnot(all.equal(r1, r2))
+   } # for (useNames ...)
+ } # for (setDimnames ...)
> 
> proc.time()
   user  system elapsed 
   0.37    0.03    0.34