% -*- texinfo -*-
% @deftypefn {Function File} {[@var{mesh}]} = MSH2Mstructmesh(@var{x},@var{y},@var{region},@var{sides},@var{string})
%
% Constructs a structured triangular 2D mesh on a rectangular domain,
% and returns a PDEtool-like mesh structure.
%
% Input:
% @itemize @minus
% @item @var{x}: vector representing the 1D meshing of the side parallel to x axis.
% @item @var{y}: vector representing the 1D meshing of the side parallel to y axis.
% @item @var{region}: number assigned to the meshed region.
% @item @var{sides}: row vector containing the four numbers assigned to the geometrical edges.
% @item @var{string}: (optional) orientation of the diagonal edge of the structured mesh.
% Values: 'right', 'left', 'random'. Default is 'right'.
% @end itemize
%
% Output: mesh basic structure, composed of the following fields
% @itemize @minus
% @item @var{p}: matrix with size 2 times number of mesh point.
% @itemize @bullet
% @item 1st row: x-coordinates of the points.
% @item 2nd row: y-coordinates of the points.
% @end itemize
% @item @var{e}: matrix with size 7 times number of mesh border edges.
% @itemize @bullet
% @item 1st row: p-matrix column number of the first edge-vertex.
% @item 2nd row: p-matrix column number of the second edge-vertex.
% @item 3rd row: not initialized, only for compatibility with standard PDE-tool like mesh.
% @item 4th row: not initialized, only for compatibility with standard PDE-tool like mesh.
% @item 5th row: number of the geometrical border upon which the referred mesh edge is lying on.
% @item 6th row: number of the region to the right of the referred mesh edge.
% @item 7th row: number of the region to the left of the referred mesh edge.
% @end itemize
% @item @var{t}:
% @itemize @bullet
% @item 1st row: p-matrix column number of the first trg-vertex.
% @item 2nd row: p-matrix column number of the second trg-vertex.
% @item 3rd row: p-matrix column number of the third trg-vertex.
% @item 4th row: number of the region upon which the referred trg is lying on.
% @end itemize
% @end itemize
%
% @seealso{MSH2Mgmsh,MSH2Mjoinstructm,MSH2Msubmesh}
% @end deftypefn