diff --git a/src/Sparse.cpp b/src/Sparse.cpp
index eef45b6..4b6d8fe 100644
--- a/src/Sparse.cpp
+++ b/src/Sparse.cpp
@@ -27,18 +27,25 @@ namespace Aurora
                 && mColIdxVector.getDataSize() == mValueVector.getDataSize();
     }
     
-    Matrix& Sparse::getColVector()
+     Matrix& Sparse::getColVector() 
     {
         return mColIdxVector;
     }
 
-    Matrix& Sparse::getRowVector()
+     Matrix& Sparse::getRowVector() 
     {
         return mRowIdxVector;
     }
 
-    Matrix& Sparse::getValVector()
+     Matrix& Sparse::getValVector() 
     {
         return mValueVector;
     }
+    size_t Sparse::getM() const{
+        return mM;
+    }
+
+    size_t Sparse::getN() const{
+        return mN;
+    }
 }
\ No newline at end of file
diff --git a/src/Sparse.h b/src/Sparse.h
index 25a43c0..3c0f27a 100644
--- a/src/Sparse.h
+++ b/src/Sparse.h
@@ -10,10 +10,11 @@ namespace Aurora {
         Sparse(Matrix Cols, Matrix Rows, Matrix Values,size_t M, size_t N);
         ~Sparse();
         bool isValid() const;
-        Matrix& getColVector();
-        Matrix& getRowVector();
-        Matrix& getValVector();
-
+        Matrix& getColVector() ;
+        Matrix& getRowVector() ;
+        Matrix& getValVector() ;
+        size_t getM() const ;
+        size_t getN() const;
         // TODO:add operators
     private:
         Matrix mColIdxVector;