irr

% -*- texinfo -*-
% @deftypefn {Function File} {} irr (@var{p}, @var{i})
% Return the internal rate of return of a series of payments @var{p}
% from an initial investment @var{i} (i.e., the solution of
% @code{npv (r, p) = i}.  If the second argument is omitted, a value of
% 0 is used.
% @seealso{npv, pv, rate}
% @end deftypefn