add one more surface test for ndg

Author: espdev

tests/ndg_evaluate.rs

@@ -23,3 +23,35 @@ fn test_make_surface() {
 
     assert_abs_diff_eq!(yi, y);
 }
+
+
+#[test]
+fn test_make_surface_1() {
+    let x0 = array![1., 2., 3.];
+    let x1 = array![1., 2., 3., 4.];
+    let x = vec![x0.view(), x1.view()];
+
+    let xi0 = array![1., 1.5, 2., 2.5, 3.];
+    let xi1 = array![1., 1.5, 2., 2.5, 3., 3.5, 4.];
+    let xi = vec![xi0.view(), xi1.view()];
+
+    let y = array![
+        [1., 2., 3., 4.],
+        [5., 6., 7., 8.],
+        [9., 10., 11., 12.],
+    ];
+
+    let yi_expected = array![
+        [1., 1.5, 2., 2.5, 3., 3.5, 4.],
+        [3., 3.5, 4., 4.5, 5., 5.5, 6.],
+        [5., 5.5, 6., 6.5, 7., 7.5, 8.],
+        [7., 7.5, 8., 8.5, 9., 9.5, 10.],
+        [9., 9.5, 10., 10.5, 11., 11.5, 12.],
+    ];
+
+    let yi = GridCubicSmoothingSpline::new(&x, &y)
+        .make().unwrap()
+        .evaluate(&xi).unwrap();
+
+    assert_abs_diff_eq!(yi, yi_expected);
+}