TEST: Add benchmarks for .select() (based on append)

Author: bluss

benches/append.rs

@@ -0,0 +1,24 @@
+#![feature(test)]
+
+extern crate test;
+use test::Bencher;
+
+use ndarray::prelude::*;
+
+#[bench]
+fn select_axis0(bench: &mut Bencher) {
+    let a = Array::<f32, _>::zeros((256, 256));
+    let selectable = vec![0, 1, 2, 0, 1, 3, 0, 4, 16, 32, 128, 147, 149, 220, 221, 255, 221, 0, 1];
+    bench.iter(|| {
+        a.select(Axis(0), &selectable)
+    });
+}
+
+#[bench]
+fn select_axis1(bench: &mut Bencher) {
+    let a = Array::<f32, _>::zeros((256, 256));
+    let selectable = vec![0, 1, 2, 0, 1, 3, 0, 4, 16, 32, 128, 147, 149, 220, 221, 255, 221, 0, 1];
+    bench.iter(|| {
+        a.select(Axis(1), &selectable)
+    });
+}