--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/+grid/old/max_h.m	Thu Sep 17 10:12:50 2015 +0200
@@ -0,0 +1,33 @@
+function [d_max, i1_max, j1_max, i2_max, j2_max] = max_h(X,Y)
+    ni = size(X,1);
+    nj = size(X,2);
+    d_max = 0;
+
+    i1_max = 0;
+    j1_max = 0;
+    i2_max = 0;
+    j2_max = 0;
+
+    D = {[0,-1],[1,0],[0,1],[-1,0]};
+
+    for i = 1:ni
+        for j = 1:nj
+            p1 = [X(i,j); Y(i,j)];
+            for k = 1:length(D)
+                i2 = i+D{k}(1);
+                j2 = j+D{k}(2);
+                if i2 >= 1 && i2 <= ni && j2 >= 1 && j2 <= nj
+                    p2 = [X(i2,j2); Y(i2,j2)];
+                    d = norm(p2-p1);
+                    if d > d_max;
+                        d_max = d;
+                        i1_max = i;
+                        j1_max = j;
+                        i2_max = i2;
+                        j2_max = j2;
+                    end
+                end
+            end
+        end
+    end
+end