Add Sparse functions.

src/Sparse.cpp

@@ -26,4 +26,19 @@ namespace Aurora
                 && mColIdxVector.getDataSize() == mRowIdxVector.getDataSize() 
                 && mColIdxVector.getDataSize() == mValueVector.getDataSize();
     }
+    
+    Matrix& Sparse::getColVector()
+    {
+        return mColIdxVector;
+    }
+
+    Matrix& Sparse::getRowVector()
+    {
+        return mRowIdxVector;
+    }
+
+    Matrix& Sparse::getValVector()
+    {
+        return mValueVector;
+    }
 }