% -*- texinfo -*-
% @deftypefn {Function File} {} pv (@var{r}, @var{n}, @var{p}, @var{l}, @var{method})
% Returns the present value of an investment that will pay off @var{p} for @var{n}
% consecutive periods, assuming an interest @var{r}.
%
% The optional argument @var{l} may be used to specify an additional
% lump-sum payment made at the end of @var{n} periods.
%
% The optional argument @var{method} may be used to specify whether
% 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).
% @seealso{pmt, nper, rate, npv}
% @end deftypefn