/usr/share/octave/packages/financial-0.4.0/taxedrr.m is in octave-financial 0.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | ## Copyright (C) 2008 Bill Denney <bill@denney.ws>
##
## This program is free software; you can redistribute it and/or modify it under
## the terms of the GNU General Public License as published by the Free Software
## Foundation; either version 3 of the License, or (at your option) any later
## version.
##
## This program is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
## details.
##
## You should have received a copy of the GNU General Public License along with
## this program; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{return} =} taxedrr (@var{pretaxreturn}, @var{taxrate})
## Compute the taxed rate of @var{return} based on a @var{pretaxreturn}
## rate and a @var{taxrate}.
## @seealso{irr, effrr, nomrr, pvvar, xirr}
## @end deftypefn
function rate = taxedrr (pretax, taxrate)
if (nargin != 2)
print_usage ();
elseif (taxrate < 0 || taxrate > 1)
error ("taxedrr: taxrate must be between 0 and 1")
endif
rate = pretax.*(1-taxrate);
endfunction
## Tests
%!assert (taxedrr (0.12, 0.30), 0.084, 10*eps)
%!assert (taxedrr (0.12, 0), 0.12, 10*eps)
%!assert (taxedrr (0.12, 1), 0, 10*eps)
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