diff --git a/assets/html/homepage.html b/assets/html/homepage.html
index 896f2ea..0390a8c 100644
--- a/assets/html/homepage.html
+++ b/assets/html/homepage.html
@@ -77,7 +77,6 @@
 
 function addString(message) {
     mathField.write(message);
-    postLaTex();
 }
 
 function delString() {
@@ -97,7 +96,6 @@
 function simulateKey(key) {
     mathField.keystroke(key);
     isClearable = false;
-    postLaTex();
     postClearable();
 }
 
diff --git a/lib/src/latex.dart b/lib/src/latex.dart
index 25cdbcd..5c4089a 100644
--- a/lib/src/latex.dart
+++ b/lib/src/latex.dart
@@ -365,16 +365,14 @@ class MatrixParser extends Parser {
   final String inputString;
   final bool isRadMode;
   final int precision;
-
-  int get length => _stream.length;
+  bool square;
+  bool single;
 
   MatrixParser(this.inputString, {this.isRadMode = true, this.precision = 10}) : super(inputString, isRadMode);
 
   @override
   void tokenize() {
-    final matrix = (string('\\begin{bmatrix}') & any().starLazy(string('\\end{bmatrix}')).flatten() & string('\\end{bmatrix}')).pick(1);
-
-    final basic = matrix.map((v)=>[v, 'b']);
+    final matrix = (string('\\begin{bmatrix}') & any().starLazy(string('\\end{bmatrix}')).flatten() & string('\\end{bmatrix}')).pick(1).map((v)=>[v, 'b']);
 
     final plus = char('+').map((v)=>[v, ['o', 2]]);
 
@@ -386,7 +384,7 @@ class MatrixParser extends Parser {
 
     final oper = plus | minus | times | divide;
     
-    final tokenize = (basic | oper).star().end();
+    final tokenize = (matrix | oper).star().end();
 
     _stream = tokenize.parse(inputString).value;
 
@@ -396,6 +394,12 @@ class MatrixParser extends Parser {
         i++;
       }
     }
+
+    if (_stream.length == 1 && _stream[0][1] == 'b') {
+      single = true;
+    } else {
+      single = false;
+    }
   }
 
   void matrixParse() {
@@ -414,6 +418,11 @@ class MatrixParser extends Parser {
           }
         }
         _stream[i][0] = Matrix(source);
+        if (single && _stream[i][0].m == _stream[i][0].n) {
+          square = true;
+        } else {
+          square = false;
+        }
       }
     }
   }
diff --git a/lib/src/mathbox.dart b/lib/src/mathbox.dart
index 4cefa45..28a71ec 100644
--- a/lib/src/mathbox.dart
+++ b/lib/src/mathbox.dart
@@ -106,7 +106,7 @@ class MathBox extends StatelessWidget {
               onMessageReceived: (JavascriptMessage message) {
                 if (message.message.contains('matrix')) {
                   matrixModel.updateExpression(message.message);
-                } else {
+                } else if (message.message.isNotEmpty) {
                   mathModel.updateExpression(message.message);
                   mathModel.calcNumber();
                 }
diff --git a/lib/src/mathmodel.dart b/lib/src/mathmodel.dart
index a0fd12b..98cb653 100644
--- a/lib/src/mathmodel.dart
+++ b/lib/src/mathmodel.dart
@@ -63,7 +63,6 @@ class MathModel with ChangeNotifier {
   }
 
   String checkHistory({@required toPrevious}) {
-    // TODO: Have index problem
     if (toPrevious) {
       if (_resultIndex>0) {
         _resultIndex--;
@@ -98,43 +97,39 @@ class MatrixModel with ChangeNotifier {
   int _precision;
   bool _isRadMode;
   bool single = true;
+  bool square = true;
+  Matrix matrix;
 
-  get result => _result.last;
+  bool get result => _result.last;
 
   void updateExpression(String expression) {
     _matrixExpression.last = expression;
-    final mp = MatrixParser(_matrixExpression.last)..tokenize();
-    single = mp.length>1?false:true;
+    final mp = MatrixParser(_matrixExpression.last, precision: _precision);
+    matrix = mp.parse();
+    single = mp.single;
+    square = mp.square;
     notifyListeners();
   }
 
   void calc() {
-    final mp = MatrixParser(_matrixExpression.last, precision: _precision);
-    Matrix matrix = mp.parse();
     _result.last = matrix;
     _matrixExpression.add(_matrixExpression.last);
     _result.add(_result.last);
   }
 
   void norm() {
-    final mp = MatrixParser(_matrixExpression.last, precision: _precision);
-    Matrix matrix = mp.parse();
     _result.last = matrix.det();
     _matrixExpression.add(_matrixExpression.last);
     _result.add(_result.last);
   }
 
   void transpose() {
-    final mp = MatrixParser(_matrixExpression.last, precision: _precision);
-    Matrix matrix = mp.parse();
     _result.last = matrix.transpose();
     _matrixExpression.add(_matrixExpression.last);
     _result.add(_result.last);
   }
 
   void invert() {
-    final mp = MatrixParser(_matrixExpression.last, precision: _precision);
-    Matrix matrix = mp.parse();
     _result.last = matrix.inverse();
     _matrixExpression.add(_matrixExpression.last);
     _result.add(_result.last);
diff --git a/lib/src/result.dart b/lib/src/result.dart
index 597eda4..6bd6436 100644
--- a/lib/src/result.dart
+++ b/lib/src/result.dart
@@ -111,7 +111,7 @@ class MatrixButton extends StatelessWidget {
             child: Text('Calculate'),
           ),
           Consumer<MatrixModel>(
-            builder: (_, model, child) => model.single?
+            builder: (_, model, child) => model.square?
               SingleMatrixButton(
                 child: child,
                 onPressed: () {
@@ -124,30 +124,30 @@ class MatrixButton extends StatelessWidget {
             child: Text('Invert'),
           ),
           Consumer<MatrixModel>(
-            builder: (_, model, child) => model.single?
+            builder: (_, model, child) => model.square?
               SingleMatrixButton(
                 child: child,
                 onPressed: () {
-                  model.transpose();
+                  model.norm();
                   mathBoxController.deleteAllExpression();
-                  mathBoxController.addString(model.display());
+                  mathBoxController.addString(model.result.toString());
                 },
               ):
               SizedBox(height: 0.0,),
-            child: Text('Transpose'),
+            child: Text('Norm'),
           ),
           Consumer<MatrixModel>(
             builder: (_, model, child) => model.single?
               SingleMatrixButton(
                 child: child,
                 onPressed: () {
-                  model.norm();
+                  model.transpose();
                   mathBoxController.deleteAllExpression();
-                  mathBoxController.addString(model.result.toString());
+                  mathBoxController.addString(model.display());
                 },
               ):
               SizedBox(height: 0.0,),
-            child: Text('Norm'),
+            child: Text('Transpose'),
           ),
           SingleMatrixButton(
             child: Text('Add Row'),