/usr/share/octave/packages/optim-1.3.0/private/ is in octave-optim 1.3.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/octave/packages/optim-1.3.0/private/__bracket_min.m
/usr/share/octave/packages/optim-1.3.0/private/__collect_constraints__.m
/usr/share/octave/packages/optim-1.3.0/private/__covd_wls__.m
/usr/share/octave/packages/optim-1.3.0/private/__covp_corp_wls__.m
/usr/share/octave/packages/optim-1.3.0/private/__dfdp__.m
/usr/share/octave/packages/optim-1.3.0/private/__lm_feasible__.m
/usr/share/octave/packages/optim-1.3.0/private/__lm_svd__.m
/usr/share/octave/packages/optim-1.3.0/private/__nonlin_residmin__.m
/usr/share/octave/packages/optim-1.3.0/private/__null_optim__.m
/usr/share/octave/packages/optim-1.3.0/private/__plot_cmds__.m
/usr/share/octave/packages/optim-1.3.0/private/__residmin_stat__.m
/usr/share/octave/packages/optim-1.3.0/private/__s2mat__.m
/usr/share/octave/packages/optim-1.3.0/private/__semi_bracket.m
/usr/share/octave/packages/optim-1.3.0/private/__siman__.m
/usr/share/octave/packages/optim-1.3.0/private/__sqp__.m
/usr/share/octave/packages/optim-1.3.0/private/optim_problems_p_r_y.data