Remove drop_{upper,lower}

Author: termoshtt

src/triangular.rs

@@ -126,15 +126,3 @@ impl<A, S> IntoTriangular<ArrayBase<S, Ix2>> for ArrayBase<S, Ix2>
         self
     }
 }
-
-pub fn drop_upper<A: Zero, S>(a: ArrayBase<S, Ix2>) -> ArrayBase<S, Ix2>
-    where S: DataMut<Elem = A>
-{
-    a.into_triangular(UPLO::Lower)
-}
-
-pub fn drop_lower<A: Zero, S>(a: ArrayBase<S, Ix2>) -> ArrayBase<S, Ix2>
-    where S: DataMut<Elem = A>
-{
-    a.into_triangular(UPLO::Upper)
-}

tests/qr.rs

@@ -15,7 +15,7 @@ fn test(a: Array2<f64>, n: usize, m: usize) {
     println!("r = \n{:?}", &r);
     assert_close_l2!(&q.t().dot(&q), &Array::eye(min(n, m)), 1e-7);
     assert_close_l2!(&q.dot(&r), &ans, 1e-7);
-    assert_close_l2!(&drop_lower(r.clone()), &r, 1e-7);
+    assert_close_l2!(&r.clone().into_triangular(UPLO::Upper), &r, 1e-7);
 }
 
 #[test]