/usr/share/octave/packages/financial-0.4.0/fv.m is in octave-financial 0.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | ## Copyright (C) 1995-1998, 2000, 2002, 2005-2007 Kurt Hornik <Kurt.Hornik@wu-wien.ac.at>
##
## 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; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} fv (@var{r}, @var{n}, @var{p}, @var{l}, @var{method})
## Return the future value at the end of period @var{n} of an investment
## which consists of @var{n} payments of @var{p} in each period,
## assuming an interest rate @var{r}.
##
## The optional argument @var{l} may be used to specify an
## additional lump-sum payment.
##
## The optional argument @var{method} may be used to specify whether the
## payments are made at the end (@code{"e"}, default) or at the
## beginning (@code{"b"}) of each period.
##
## Note that the rate @var{r} is specified as a fraction (i.e., 0.05,
## not 5 percent).
## @end deftypefn
function v = fv (r, n, p, l, m)
if (nargin < 3 || nargin > 5)
print_usage ();
endif
if (! (isscalar (r) && r > -1))
error ("fv: r must be a scalar > -1");
elseif (! (isscalar (n) && n > 0))
error ("fv: n must be a positive scalar");
elseif (! isscalar (p))
error ("fv: p must be a scalar");
endif
if (r != 0)
v = p * ((1 + r)^n - 1) / r;
else
v = p * n;
endif
if (nargin > 3)
if (nargin == 5)
if (! ischar (m))
error ("fv: `method' must be a string");
endif
elseif ischar (l)
m = l;
l = 0;
else
m = "e";
endif
if strcmp (m, "b")
v = v * (1 + r);
endif
if isscalar (l)
v = v + fvl (r, n, l);
else
error ("fv: l must be a scalar");
endif
endif
endfunction
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