% -*- texinfo -*-
% @deftypefn {Function File} {[@var{M}]} = @
% BIM2Aboundarymass( @var{mesh}, @var{sidelist}, @var{nodelist})
%
% Builds the boundary mass-matrix needed to apply flux boundary conditions.
%
% Input:
% @itemize @minus
% @item @var{mesh}: PDEtool-like mesh with required field 'p', 'e', 't'.
% @item @var{sidelist}: list of the sides of the geometrical border.
% @item @var{nodelist}: (optional) list of the degrees of freedom on
% the boundary
% @end itemize
%
% @end deftypefn