R: Pack raw vectors

pack {pack} | R Documentation

## Pack raw vectors

### Description

Combine values into a raw vector according to the values in `template`.

### Usage

      pack(template, ...)

### Arguments

`template` | A string, see 'Details'
`...` | Values/objects to be packed into a raw vector

### Details

Currently supported `template` values are:
'a' - A null padded string
'A' - A space padded string
'b' - An ascending bit order binary vector, (must be a multiple of 8 long)
'B' - An descending bit order binary vector, (must be a multiple of 8 long)
'C' - An unsigned char (octet) value
'v' - An unsigned short (16-bit) in "VAX" (little-endian) order
'V' - An unsigned long (32-bit) in "VAX" (little-endian) order
'x' - A null byte
Both 'a' and 'A' may be followed by a repeat value. A repeat value of '*' will cause the remainder of the bytes in `values` to be placed in the last element.
'/' allows packing and unpacking of a sequence of values where the packed structure contains a packed item count followed by the packed items themselves.
If `template` requires more arguments to `pack` than actually given, `pack` pads with null bytes. If `template` requires fewer arguments to `pack` than actually given, extra arguments are ignored.

### Value

A raw vector following the elements in `template`.

### Author(s)

Josh Ulrich

### References

http://perldoc.perl.org/functions/pack.html

### See Also

`unpack`

### Examples

      (x <- pack('A4 C v A8 V', 'pack', 2, 8, 'sequence', 68098))
      (u1 <- unpack('A4 C H*', x))
      (u2 <- unpack('v/A V', u1[[3]]))

[Package pack version 0.1-1 Index]