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} =} effrr (@var{rate}, @var{numperiods})
18 ## Compute the effective rate of return based on a nominal @var{rate}
19 ## over a number of periods, @var{numperiods}.
20 ## @seealso{irr, nomrr}
23 function rate = effrr (rate, numperiods)
29 rate = (1+rate./numperiods).^numperiods - 1;
34 %!assert (effrr (0.09, 12), 0.0938, 0.00005)