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[project @ 2005-05-18 17:20:31 by jwe]
author jwe
date Wed, 18 May 2005 17:20:32 +0000
parents 4c8a2e4e0717
children 2a16423e4aa0
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1 ## Copyright (C) 1995, 1996, 1997 Kurt Hornik
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 2, or (at your option)
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8 ## any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, write to the Free
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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18 ## 02110-1301, USA.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} pvl (@var{r}, @var{n}, @var{p})
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22 ## Return the present value of an investment that will pay off @var{p}
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23 ## in one lump sum at the end of @var{n} periods, given the interest
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24 ## rate @var{r}.
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25 ##
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26 ## Note that the rate @var{r} is specified as a fraction (i.e., 0.05,
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27 ## not 5 percent).
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28 ## @end deftypefn
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30 ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at>
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31 ## Description: Present value of an investment that pays off at the end
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32
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33 function v = pvl (r, n, p)
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34
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35 if (nargin != 3)
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36 usage ("pvl (r, n, p)");
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37 endif
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38
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39 if (! (isscalar (r) && (r > -1)))
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40 error ("pvl: r has to be a scalar > -1");
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41 elseif (! (isscalar (n) && (n > 0)))
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42 error ("pvl: n has to be a positive scalar");
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43 elseif (! isscalar (p))
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44 error ("pvl: p has to be a scalar");
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45 endif
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46
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47 v = p / (1 + r)^n;
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48
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49 endfunction