1 ## Copyright (C) 2008 Bill Denney <bill@denney.ws>
3 ## This program is free software; you can redistribute it and/or modify it under
4 ## the terms of the GNU General Public License as published by the Free Software
5 ## Foundation; either version 3 of the License, or (at your option) any later
8 ## This program is distributed in the hope that it will be useful, but WITHOUT
9 ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
13 ## You should have received a copy of the GNU General Public License along with
14 ## this program; if not, see <http://www.gnu.org/licenses/>.
17 ## @deftypefn {Function File} {@var{return} =} taxedrr (@var{pretaxreturn}, @var{taxrate})
18 ## Compute the taxed rate of @var{return} based on a @var{pretaxreturn}
19 ## rate and a @var{taxrate}.
20 ## @seealso{irr, effrr, nomrr, pvvar, xirr}
23 function rate = taxedrr (pretax, taxrate)
27 elseif (taxrate < 0 || taxrate > 1)
28 error ("taxedrr: taxrate must be between 0 and 1")
31 rate = pretax.*(1-taxrate);
36 %!assert (taxedrr (0.12, 0.30), 0.084, 10*eps)
37 %!assert (taxedrr (0.12, 0), 0.12, 10*eps)
38 %!assert (taxedrr (0.12, 1), 0, 10*eps)