improved test

Author: sebasv

tests/oper.rs

@@ -272,8 +272,8 @@ fn fold_and_sum() {
 }
 
 #[test]
-fn fold_and_prod() {
-    let a = Array::linspace(0., 127., 128).into_shape((8, 16)).unwrap();
+fn scalar_prod() {
+    let a = Array::linspace(0.5, 2., 128).into_shape((8, 16)).unwrap();
     assert_approx_eq(a.fold(1., |acc, &x| acc * x), a.scalar_prod(), 1e-5);
 
     // test different strides
@@ -289,25 +289,6 @@ fn fold_and_prod() {
             assert_approx_eq(prod, a1.scalar_prod(), 1e-5);
         }
     }
-
-    // skip a few elements
-    let max = 8 as Ixs;
-    for i in 1..max {
-        for skip in 1..max {
-            let a1 = a.slice(s![.., ..;i]);
-            let mut iter1 = a1.iter();
-            for _ in 0..skip {
-                iter1.next();
-            }
-            let iter2 = iter1.clone();
-
-            let mut prod = 1.;
-            for elt in iter1 {
-                prod *= *elt;
-            }
-            assert_approx_eq(iter2.fold(1., |acc, &x| acc * x), prod, 1e-5);
-        }
-    }
 }
 
 fn range_mat(m: Ix, n: Ix) -> Array2<f32> {