diff --git a/matrix.hpp b/matrix.hpp
index 20bce4a..5e4d9de 100644
--- a/matrix.hpp
+++ b/matrix.hpp
@@ -11,12 +11,20 @@ private:
   vector *cols;
 
 public:
-  matrix(const long long num_cols, const long long num_rows) {
-    this->num_cols = num_rows;
-    this->num_rows = num_cols;
-    this->cols = (vector *)calloc(sizeof(vector), num_rows);
-    for (long long i = 0; i < num_rows; i++) {
-      this->cols[i] = vector(num_cols);
+  matrix(const long long num_rows, const long long num_cols) {
+    this->num_cols = num_cols;
+    this->num_rows = num_rows;
+    this->cols = (vector *)calloc(sizeof(vector), num_cols);
+    for (long long i = 0; i < num_cols; i++) {
+      this->cols[i] = vector(num_rows);
+    }
+  }
+  matrix(const matrix &m) {
+    this->num_cols = m.num_cols;
+    this->num_rows = m.num_rows;
+    this->cols = (vector *)calloc(sizeof(vector), m.num_cols);
+    for (long long i = 0; i < m.num_cols; i++) {
+      this->cols[i] = m[i];
     }
   }
   ~matrix() {