diff -r b673081db86b -r 117bc4542b61 +grid/lebedev2d.m
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/+grid/lebedev2d.m	Wed Apr 29 21:04:06 2020 -0700
@@ -0,0 +1,57 @@
+% Creates a 2D staggered grid of Lebedev (checkerboard) type
+% Primal grid: equidistant with m points.
+% Dual grid: m + 1 points, h/2 spacing first point.
+% First grid line is "primal", 2nd is "dual", etc.
+%
+% Examples
+%   g = grid.Lebedev2d(m, xlims, ylims)
+%   g = grid.Lebedev2d([21, 31], {0,2}, {0,3})
+function g = lebedev2d(m, xlims, ylims, opSet)
+
+    default_arg('opSet', @(m,lim) sbp.D1StaggeredUpwind(m,lim,2));
+
+    if ~iscell(xlims) || numel(xlims) ~= 2
+        error('grid:primalDual2D:InvalidLimits','The limits should be cell arrays with 2 elements.');
+    end
+
+    if ~iscell(ylims) || numel(ylims) ~= 2
+        error('grid:primalDual2D:InvalidLimits','The limits should be cell arrays with 2 elements.');
+    end
+
+    if xlims{1} > xlims{2}
+        error('grid:primalDual2D:InvalidLimits','The elements of the limit must be increasing.');
+    end
+
+    if ylims{1} > ylims{2}
+        error('grid:primalDual2D:InvalidLimits','The elements of the limit must be increasing.');
+    end
+
+    opsX = opSet(m(1), xlims);
+    xp = opsX.x_primal;
+    xd = opsX.x_dual;
+
+    opsY = opSet(m(2), ylims);
+    yp = opsY.x_primal;
+    yd = opsY.x_dual;
+
+    % 4 Cartesian grids with spacing h
+    % 2 grids for displacements (u)
+    % 2 grids for stresses (sigma)
+    % Density needs to be evaluated on the u grids
+    % The stiffness tensor is evaluated on the sigma grids
+
+    gu1 = grid.Cartesian(xp, yp);
+    gu2 = grid.Cartesian(xd, yd);
+    gs1 = grid.Cartesian(xd, yp);
+    gs2 = grid.Cartesian(xp, yd);
+
+    gu = {gu1, gu2};
+    gs = {gs1, gs2};
+
+    dim = 2;
+    g = grid.Staggered(dim, gu, gs);
+
+end
+
+
+