% -*- 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