Implement bilinear interpolation

linear-interpolation/src/vecutils.cpp

@@ -12,3 +12,13 @@ void print3DMatrixSlice(const arr3d<double> &arr, int t) {
         println("");
     }
 }
+
+void print3DMatrixSlice(const arr3d<std::pair<double, double>> &arr, int t) {
+    for (int x = 0; x < arr.extent(1); x++) {
+        for (int y = 0; y < arr.extent(2); y++) {
+            auto [u,v] = arr[t,x,y];
+            print("({:>7.4f}, {:>7.4f}) ", u, v);
+        }
+        println("");
+    }
+}