## Copyright (C) 1995, 1996, 1997 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 2, 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 file. If not, write to the Free Software Foundation, ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ## usage: pvl (r, n, p) ## ## Returns the present value of an investment that will pay off p in one ## lump sum at the end of n periods, given the interest rate r. ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at> ## Description: Present value of an investment that pays off at the end function v = pvl (r, n, p) if (nargin != 3) usage ("pvl (r, n, p)"); endif if !(is_scalar (r) && (r > -1)) error ("pvl: r has to be a scalar > -1"); elseif !(is_scalar (n) && (n > 0)) error ("pvl: n has to be a positive scalar"); elseif !is_scalar (p) error ("pvl: p has to be a scalar"); endif v = p / (1 + r)^n; endfunction

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