R Under development (unstable) (2024-01-23 r85822 ucrt) -- "Unsuffered Consequences"
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> library("R.huge")
R.huge v0.10.1 successfully loaded. See ?R.huge for help.

Attaching package: 'R.huge'

The following objects are masked from 'package:base':

    colnames, flush, isOpen, ncol, nrow, rowMeans, rowSums, rownames

> library("R.utils")
Loading required package: R.oo
Loading required package: R.methodsS3
R.methodsS3 v1.8.2 (2022-06-13 22:00:14 UTC) successfully loaded. See ?R.methodsS3 for help.
R.oo v1.26.0 successfully loaded. See ?R.oo for help.

Attaching package: 'R.oo'

The following object is masked from 'package:R.methodsS3':

    throw

The following objects are masked from 'package:methods':

    getClasses, getMethods

The following objects are masked from 'package:base':

    attach, detach, load, save

R.utils v2.12.3 (2023-11-18 01:00:02 UTC) successfully loaded. See ?R.utils for help.

Attaching package: 'R.utils'

The following object is masked from 'package:utils':

    timestamp

The following objects are masked from 'package:base':

    cat, commandArgs, getOption, isOpen, nullfile, parse, use, warnings

> 
> if ("covr" %in% loadedNamespaces())
+   options("R.utils::onNonSeekable"="warning")
> 
> for (byrow in c(FALSE, TRUE)) {
+   pathname <- "example.Rmatrix"
+   if (isFile(pathname)) {
+     file.remove(pathname)
+     if (isFile(pathname))
+       stop("File not deleted: ", pathname)
+   }
+ 
+   nrow <- 10
+   ncol <- 10
+   X <- matrix(0, nrow=nrow, ncol=ncol, byrow=TRUE)
+   X[] <- 1:100
+ 
+   Y <- FileFloatMatrix(pathname, nrow=nrow(X), ncol=ncol(X), byrow=byrow)
+   Y[] <- X[]
+   stopifnot(identical(X[], Y[]))
+ 
+   rr <- c(1,3)
+   stopifnot(identical(X[rr,], Y[rr,]))
+ 
+   rr <- 6:2
+   cc <- c(1,8,4,2:3)
+   X[rr,cc] <- seq_len(length(rr)*length(cc))
+   Y[rr,cc] <- X[rr,cc]
+   stopifnot(identical(X[], Y[]))
+ 
+   close(Y)
+   rm(Y)
+   gc()
+ }
> 
> proc.time()
   user  system elapsed 
   0.48    0.15    0.57