## Copyright (C) 1995, 1996, 1997, 1998, 2000, 2002, 2005, 2006, 2007 ## Kurt Hornik ## ## 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; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {} pvl (@var{r}, @var{n}, @var{p}) ## Return the present value of an investment that will pay off @var{p} ## in one lump sum at the end of @var{n} periods, given the interest ## rate @var{r}. ## ## Note that the rate @var{r} is specified as a fraction (i.e., 0.05, ## not 5 percent). ## @end deftypefn ## Author: KH <Kurt.Hornik@wu-wien.ac.at> ## Description: Present value of an investment that pays off at the end function v = pvl (r, n, p) if (nargin != 3) print_usage (); endif if (! (isscalar (r) && (r > -1))) error ("pvl: r has to be a scalar > -1"); elseif (! (isscalar (n) && n > 0)) error ("pvl: n has to be a positive scalar"); elseif (! isscalar (p)) error ("pvl: p has to be a scalar"); endif v = p / (1 + r)^n; endfunction

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