getrelativefilename given absolute directories and absolute filenames, returns relative file names

## Syntax

    rel_file = getrelativefilename(abs_dir, abs_file)

## Arguments

abs_dir

  a character string or matrix of character strings: absolute directories.

abs_file

  a character string or matrix of character strings: absolute filenames.

rel_file

  a character string or a matrix of character strings: relative filenames.

## Description

Given absolute directories `abs_dir` and absolute filenames `abs_file`, `getrelativefilename` returns relative file names `rel_file`. That is, if the input arguments are some string matrices (m x n), for indexes (i, j), `getrelativefilename` returns `rel_file(i,j)` associated with `abs_dir(i,j)` and `abs_file(i,j)`. This implies that `abs_dir` and `abs_file` must have the same dimensions.

For example, if the current directory is `C:\scilab\bin` and the filename `C:\scilab\modules\helptools\readme.txt` is given, `getrelativefilename` will return `..\modules\helptools\readme.txt`.

## Examples

    getrelativefilename(pwd(), SCI+'/COPYING')
    getrelativefilename(TMPDIR, SCI+'/COPYING')
    getrelativefilename(SCI+'/bin', SCI+'/COPYING')
    getrelativefilename(pwd(), SCI+'/ACKNOWLEDGMENTS')
    getrelativefilename(TMPDIR, SCI+'/ACKNOWLEDGMENTS')
    getrelativefilename(SCI+'/bin', SCI+'/ACKNOWLEDGMENTS')
    getrelativefilename([SCI+'/bin',SCI+'/bin'], [SCI+'/ACKNOWLEDGMENTS',SCI+'/ACKNOWLEDGMENTS'])

## See also

- getshortpathname
- getlongpathname
- pwd