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[project @ 2007-10-12 06:40:56 by jwe]
author jwe
date Fri, 12 Oct 2007 06:41:26 +0000
parents fc8ed0c77e08
children a1dbe9d80eee
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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 3 of the License, or (at
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8 ## your option) 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, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} fvl (@var{r}, @var{n}, @var{l})
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21 ## Return the future value at the end of @var{n} periods of an initial
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22 ## lump sum investment @var{l}, given a per-period interest rate
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23 ## @var{r}.
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24 ##
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25 ## Note that the rate @var{r} is specified as a fraction (i.e., 0.05,
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26 ## not 5 percent).
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27 ## @end deftypefn
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28
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29 ## Author: KH <Kurt.Hornik@wu-wien.ac.at>
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30 ## Description: Future value of an initial lump sum investment
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31
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32 function v = fvl (r, n, l)
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33
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34 if (nargin != 3)
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35 print_usage ();
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36 endif
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37
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38 if (! (isscalar (r) && r > -1))
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39 error ("fvl: r has to be a scalar > -1");
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40 elseif (! (isscalar (n) && n > 0))
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41 error ("fvl: n has to be a positive scalar");
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42 elseif (! isscalar (l))
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43 error ("fvl: l has to be a scalar");
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44 endif
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45
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46 v = l * (1 + r)^n;
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47
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48 endfunction