Function xm_to_m(fn,targetdir) converts every multiline-string construct of the form of "<<< ... >>>" into a proper Octave string in the form of '...'. The string is read from the specified file and the result of the convertion is written into a file with extension ".m", in the given target directory. If no target directory is given, the result is written into the working directory. Note that the text in between -- is not changed at all: percent signs, single and double quotes and backslashes retain their literal meaning; -- may not contain the tokens <<< and >>>. (c) 2026 fabien van mook 2026.08.20 release of this file within package "fvm-xm" under GNU GPLv3+