/usr/share/octave/3.8.2/m/elfun/ is in octave-common 3.8.2-4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/octave/3.8.2/m/elfun/acosd.m
/usr/share/octave/3.8.2/m/elfun/acot.m
/usr/share/octave/3.8.2/m/elfun/acotd.m
/usr/share/octave/3.8.2/m/elfun/acoth.m
/usr/share/octave/3.8.2/m/elfun/acsc.m
/usr/share/octave/3.8.2/m/elfun/acscd.m
/usr/share/octave/3.8.2/m/elfun/acsch.m
/usr/share/octave/3.8.2/m/elfun/asec.m
/usr/share/octave/3.8.2/m/elfun/asecd.m
/usr/share/octave/3.8.2/m/elfun/asech.m
/usr/share/octave/3.8.2/m/elfun/asind.m
/usr/share/octave/3.8.2/m/elfun/atan2d.m
/usr/share/octave/3.8.2/m/elfun/atand.m
/usr/share/octave/3.8.2/m/elfun/cosd.m
/usr/share/octave/3.8.2/m/elfun/cot.m
/usr/share/octave/3.8.2/m/elfun/cotd.m
/usr/share/octave/3.8.2/m/elfun/coth.m
/usr/share/octave/3.8.2/m/elfun/csc.m
/usr/share/octave/3.8.2/m/elfun/cscd.m
/usr/share/octave/3.8.2/m/elfun/csch.m
/usr/share/octave/3.8.2/m/elfun/sec.m
/usr/share/octave/3.8.2/m/elfun/secd.m
/usr/share/octave/3.8.2/m/elfun/sech.m
/usr/share/octave/3.8.2/m/elfun/sind.m
/usr/share/octave/3.8.2/m/elfun/tand.m