diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 8997c0e..33aeea2 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -7,6 +7,7 @@ add_executable(BTCS_1D_proto_example BTCS_1D_proto_example.cpp)
 add_executable(BTCS_2D_proto_example BTCS_2D_proto_example.cpp)
 add_executable(FTCS_2D_proto_example_mdl FTCS_2D_proto_example_mdl.cpp)
 add_executable(reference-FTCS_2D_closed reference-FTCS_2D_closed.cpp)
+add_executable(meeting_example meeting_example.cpp)
 target_link_libraries(first_example tug)
 target_link_libraries(second_example tug)
 target_link_libraries(boundary_example1D tug)
@@ -16,6 +17,7 @@ target_link_libraries(BTCS_1D_proto_example tug)
 target_link_libraries(BTCS_2D_proto_example tug)
 target_link_libraries(FTCS_2D_proto_example_mdl tug)
 target_link_libraries(reference-FTCS_2D_closed tug)
+target_link_libraries(meeting_example tug)
 # target_link_libraries(FTCS_2D_proto_example easy_profiler) 
 
 add_executable(FTCS_2D_proto_closed_mdl FTCS_2D_proto_closed_mdl.cpp)
diff --git a/examples/meeting_example.cpp b/examples/meeting_example.cpp
new file mode 100644
index 0000000..27d5540
--- /dev/null
+++ b/examples/meeting_example.cpp
@@ -0,0 +1,38 @@
+#include "tug/Boundary.hpp"
+#include <tug/Simulation.hpp>
+
+int main(int argc, char *argv[]) {
+    int row = 20;
+    int col = 30;
+
+    // grid
+    Grid grid = Grid(row,col);
+    MatrixXd concentrations = MatrixXd::Constant(row,col,0);
+    concentrations(10,4) = 2000;
+    grid.setConcentrations(concentrations);
+    MatrixXd alphaX = MatrixXd::Constant(row,col,1);
+    for (int i = 0; i < row; i++) {
+        alphaX(i,0) = 0.05;
+    }
+    MatrixXd alphaY = MatrixXd::Constant(row,col,1);
+    grid.setAlpha(alphaX, alphaY);
+
+    // boundary
+    Boundary bc = Boundary(grid);
+    bc.setBoundarySideConstant(BC_SIDE_LEFT, 0);
+    bc.setBoundarySideConstant(BC_SIDE_RIGHT, 0);
+    bc.setBoundarySideConstant(BC_SIDE_TOP, 0);
+    bc.setBoundarySideConstant(BC_SIDE_BOTTOM, 0);
+    bc.setBoundaryElementClosed(BC_SIDE_LEFT, 3);
+    bc.setBoundaryElementClosed(BC_SIDE_LEFT, 4);
+    bc.setBoundaryElementClosed(BC_SIDE_LEFT, 5);
+    bc.setBoundaryElementConstant(BC_SIDE_BOTTOM, 17, 100);
+
+    // simulation
+    Simulation sim = Simulation(grid, bc, BTCS_APPROACH);
+    sim.setTimestep(0.1);
+    sim.setIterations(100);
+    sim.setOutputCSV(CSV_OUTPUT_XTREME);
+
+    sim.run();
+}
\ No newline at end of file
diff --git a/src/BTCSv2.cpp b/src/BTCSv2.cpp
index 8b7ed21..5e96d94 100644
--- a/src/BTCSv2.cpp
+++ b/src/BTCSv2.cpp
@@ -342,7 +342,7 @@ static void BTCS_2D(Grid &grid, Boundary &bc, double &timestep) {
     for (int i = 0; i < colMax; i++) {
 
         // swap alphas, boundary conditions and sx/sy for column-wise calculation
-        A = createCoeffMatrix(alphaY, bcLeft, bcRight, rowMax, i, sy);
+        A = createCoeffMatrix(alphaY, bcTop, bcBottom, rowMax, i, sy);
         b = createSolutionVector(concentrations_t1, alphaY, alphaX, bcTop, bcBottom, 
                                     bcLeft, bcRight, rowMax, i, sy, sx);
         row_t1 = solve(A, b);
diff --git a/src/Boundary.cpp b/src/Boundary.cpp
index 8f248cf..bba7d9d 100644
--- a/src/Boundary.cpp
+++ b/src/Boundary.cpp
@@ -64,22 +64,36 @@ void Boundary::setBoundarySideClosed(BC_SIDE side) {
     if(grid.getDim() == 1){
         if((side == BC_SIDE_BOTTOM) || (side == BC_SIDE_TOP)){
           throw_invalid_argument(
-              "For the one-dimensional trap, only the BC_SIDE_LEFT and "
+              "For the one-dimensional case, only the BC_SIDE_LEFT and "
               "BC_SIDE_RIGHT borders exist.");
         }
     }
-    this->boundaries[side] = vector<BoundaryElement>(grid.getRow(), BoundaryElement());
+
+    int n;
+    if (side == BC_SIDE_LEFT || side == BC_SIDE_RIGHT) {
+        n = grid.getRow();
+    } else {
+        n = grid.getCol();
+    }
+    this->boundaries[side] = vector<BoundaryElement>(n, BoundaryElement());
 }
 
 void Boundary::setBoundarySideConstant(BC_SIDE side, double value) {
     if(grid.getDim() == 1){
         if((side == BC_SIDE_BOTTOM) || (side == BC_SIDE_TOP)){
           throw_invalid_argument(
-              "For the one-dimensional trap, only the BC_SIDE_LEFT and "
+              "For the one-dimensional case, only the BC_SIDE_LEFT and "
               "BC_SIDE_RIGHT borders exist.");
         }
     }
-    this->boundaries[side] = vector<BoundaryElement>(grid.getRow(), BoundaryElement(value));
+
+    int n;
+    if (side == BC_SIDE_LEFT || side == BC_SIDE_RIGHT) {
+        n = grid.getRow();
+    } else {
+        n = grid.getCol();
+    }
+    this->boundaries[side] = vector<BoundaryElement>(n, BoundaryElement(value));
 }
 
 void Boundary::setBoundaryElementClosed(BC_SIDE side, int index) {