% -*- texinfo -*-
% @deftypefn {Function File} {} polyarea (@var{x}, @var{y})
% @deftypefnx {Function File} {} polyarea (@var{x}, @var{y}, @var{dim})
%
% Determines area of a polygon by triangle method. The variables
% @var{x} and @var{y} define the vertex pairs, and must therefore have
% the same shape. They can be either vectors or arrays. If they are
% arrays then the columns of @var{x} and @var{y} are treated separately
% and an area returned for each.
%
% If the optional @var{dim} argument is given, then @code{polyarea}
% works along this dimension of the arrays @var{x} and @var{y}.
%
% @end deftypefn