--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/+sbp/+implementations/d1_upwind_5.m	Thu Sep 08 15:35:45 2016 +0200
@@ -0,0 +1,31 @@
+function [H, HI, Dp, Dm, e_1, e_m] = d1_upwind_5(m,h)
+    Hv=ones(m,1);
+    Hv(1:4)=[0.251e3/0.720e3; 0.299e3/0.240e3; 0.211e3/0.240e3; 0.739e3/0.720e3;];
+    Hv(m-3:m)=rot90(Hv(1:4),2);
+    Hv = Hv*h;
+    H = spdiag(Hv,0);
+    HI = spdiag(1./Hv,0);
+
+    q_diags   = [-2 -1 0 1 2 3];
+    q_stencil = [1/20 -1/2 -1/3 +1 -1/4 +1/30];
+    Qp = stripeMatrix(q_stencil, q_diags,m);
+
+    Q_U = [
+        -0.1e1/0.120e3 0.941e3/0.1440e4 -0.47e2/0.360e3 -0.7e1/0.480e3;
+        -0.869e3/0.1440e4 -0.11e2/0.120e3 0.25e2/0.32e2 -0.43e2/0.360e3;
+        0.29e2/0.360e3 -0.17e2/0.32e2 -0.29e2/0.120e3 0.1309e4/0.1440e4;
+        0.1e1/0.32e2 -0.11e2/0.360e3 -0.661e3/0.1440e4 -0.13e2/0.40e2;
+    ];
+
+    Qp(1:4,1:4)=Q_U;
+    Qp(m-3:m,m-3:m)=flipud( fliplr(Q_U(1:4,1:4) ) )'; %%% This is different from standard SBP
+
+    Qm=-Qp';
+
+    e_1=zeros(m,1);e_1(1)=1;
+    e_m=zeros(m,1);e_m(m)=1;
+
+    Dp=HI*(Qp-1/2*e_1*e_1'+1/2*e_m*e_m') ;
+
+    Dm=HI*(Qm-1/2*e_1*e_1'+1/2*e_m*e_m') ;
+end