@Test
public void create() {

	final List<Sample<Double>> points = List.of(
		Sample.ofDouble(1, 2, 3, 4),
		Sample.ofDouble(1, 2, 3, 4),
		Sample.ofDouble(1, 2, 3, 4),
		Sample.ofDouble(1, 2, 3, 4)
	);
	final SampleList<Double> samples = new SampleList<>(points);
	final var result = samples.eval(MathExpr.parse("x + y + z - y").toTree());
	for (var y : result.calculated()) {
		Assert.assertEquals(y.doubleValue(), 4.0);
	}
}