checkRdaFiles {tools} | R Documentation

## Report on Details of Saved Images or Re-saves them

### Description

This reports for each of the files produced by `save` the size, if it was saved in ASCII or XDR binary format, and if it was compressed (and if so in what format).

Usually such files have extension ‘.rda’ or ‘.RData’, hence the name of the function.

### Usage

    checkRdaFiles(paths)
    resaveRdaFiles(paths, compress = c("auto", "gzip", "bzip2", "xz"),
                   compression_level, version = NULL)

### Arguments

`paths` | A character vector of paths to `save` files. If this specifies a single directory, it is taken to refer to all ‘.rda’ and ‘.RData’ files in that directory.
`compress, compression_level` | Type and level of compression: see `save`. Values of `compress` can be abbreviated.
`version` | The format to be used when re-saving: see `save`.

### Details

`compress = "auto"` asks R to choose the compression and ignores `compression_level`. It will try `"gzip"`, `"bzip2"` and if the `"gzip"` compressed size is over 10Kb, `"xz"` and choose the smallest compressed file (but with a 10% bias towards `"gzip"`). This can be slow.

For back-compatibility, `version = NULL` is interpreted to mean version 2: however version-3 files will only be saved as version 3.

### Value

For `checkRdaFiles`, a data frame with rows names `paths` and columns

`size` | numeric: file size in bytes, `NA` if the file does not exist.
`ASCII` | logical: true for save(ASCII = TRUE), `NA` if the format is not that of an R save file.
`compress` | character: type of compression. One of `"gzip"`, `"bzip2"`, `"xz"`, `"none"` or `"unknown"` (which means that if this is an R save file it is from a later version of R).
`version` | integer: the version of the save – usually `2` but `1` for very old files, and `NA` for other files. Unfortunately `2` means ‘version 2 or later’.

### Examples

    ## Not run:
    ## from a package top-level source directory
    paths <- sort(Sys.glob(c("data/*.rda", "data/*.RData")))
    (res <- checkRdaFiles(paths))
    ## pick out some that may need attention
    bad <- is.na(res$ASCII) | res$ASCII | (res$size > 1e4 & res$compress == "none")
    res[bad, ]

    ## End(Not run)

[Package tools version 3.5.1 Index]