--- a/+sbp/+implementations/d2_2.m	Mon Jan 02 09:07:49 2017 +0100
+++ b/+sbp/+implementations/d2_2.m	Mon Jan 02 09:12:05 2017 +0100
@@ -1,5 +1,5 @@
 function [H, HI, D1, D2, e_1, e_m, M, Q, S_1, S_m] = d2_2(m,h)
-    
+
     BP = 1;
     if(m<2*BP)
         error(['Operator requires at least ' num2str(2*BP) ' grid points']);
@@ -11,33 +11,40 @@
     H=(speye(m,m));H(1,1)=0.5;H(m,m)=0.5;
     H=h*H;
     HI=inv(H);
-    
+
     diags   = -1:1;
     stencil = [-1/2 0 1/2];
     D1 = stripeMatrix(stencil, diags, m);
-    
-    D1(1,1)=-1;D1(1,2)=1;D1(m,m-1)=-1;D1(m,m)=1;
-    D1(m,m-1)=-1;D1(m,m)=1;
-    D1=D1/h;
+
+    D1(1,1) = -1;
+    D1(1,2) = 1;
 
-    Q=H*D1 + 1/2*(e_1*e_1') - 1/2*(e_m*e_m');
+    D1(m,m-1) = -1;
+    D1(m,m)   = 1;
+
+    D1 = D1/h;
+
+    Q = H*D1 + 1/2*(e_1*e_1') - 1/2*(e_m*e_m');
 
     diags   = -1:1;
     stencil = [1 -2 1];
     D2 = stripeMatrix(stencil, diags, m);
-    
-    D2(1,1)=1;D2(1,2)=-2;D2(1,3)=1;
-    D2(m,m-2)=1;D2(m,m-1)=-2;D2(m,m)=1;
-    D2=D2/h^2;
 
-    S_U=[-3/2, 2, -1/2]/h;
-    S_1=sparse(1,m);
-    S_1(1:3)=S_U;
-    S_m=sparse(1,m);
-    S_m(m-2:m)=fliplr(-S_U);
+    D2(1,1) = 1;
+    D2(1,2) = -2;
+    D2(1,3) = 1;
+    D2(m,m-2) = 1;
+    D2(m,m-1) = -2;
+    D2(m,m)   = 1;
+    D2 = D2/h^2;
 
+    S_U = [-3/2, 2, -1/2]/h;
+    S_1 = sparse(1,m);
+    S_1(1:3) = S_U;
+    S_m = sparse(1,m);
+    S_m(m-2:m) = fliplr(-S_U);
 
-    M=-H*D2-e_1*S_1+e_m*S_m;
+    M = -H*D2-e_1*S_1+e_m*S_m;
     S_1 = S_1';
     S_m = S_m';
 end
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