feat: lasso documentation

src/linalg/naive/dense_matrix.rs

@@ -187,9 +187,7 @@ impl<T: RealNumber> BaseVector<T> for Vec<T> {
             );
         }
 
-        for i in 0..self.len() {
-            self[i] = other[i];
-        }
+        self[..].clone_from_slice(&other[..]);
     }
 }
 
@@ -929,9 +927,7 @@ impl<T: RealNumber> BaseMatrix<T> for DenseMatrix<T> {
             );
         }
 
-        for i in 0..self.values.len() {
-            self.values[i] = other.values[i];
-        }
+        self.values[..].clone_from_slice(&other.values[..]);
     }
 
     fn abs_mut(&mut self) -> &Self {
@@ -1066,6 +1062,14 @@ mod tests {
         assert_eq!(32.0, BaseVector::dot(&v1, &v2));
     }
 
+    #[test]
+    fn vec_copy_from() {
+        let mut v1 = vec![1., 2., 3.];
+        let v2 = vec![4., 5., 6.];
+        v1.copy_from(&v2);
+        assert_eq!(v1, v2);
+    }
+
     #[test]
     fn vec_approximate_eq() {
         let a = vec![1., 2., 3.];
@@ -1199,6 +1203,14 @@ mod tests {
         assert_eq!(a.dot(&b), 32.);
     }
 
+    #[test]
+    fn copy_from() {
+        let mut a = DenseMatrix::from_2d_array(&[&[1., 2.], &[3., 4.], &[5., 6.]]);
+        let b = DenseMatrix::from_2d_array(&[&[7., 8.], &[9., 10.], &[11., 12.]]);
+        a.copy_from(&b);
+        assert_eq!(a, b);
+    }
+
     #[test]
     fn slice() {
         let m = DenseMatrix::from_2d_array(&[