Fixes accidental ctrl+z before publishing; TGIF

Author: danburzo

src/interpolate/splineMonotone.js

@@ -37,8 +37,8 @@ const monotone = (y_im1, y_i, y_ip1, y_ip2, h, t) => {
 		min(abs(s_i), abs(s_ip1), 0.5 * abs((y_ip2 - y_i) / (2 * h)));
 
 	return (
-		((yp_i + yp_ip1 - 2 * si) / h2) * t3 +
-		((3 * si - 2 * yp_i - yp_ip1) / h) * t2 +
+		((yp_i + yp_ip1 - 2 * s_i) / h2) * t3 +
+		((3 * s_i - 2 * yp_i - yp_ip1) / h) * t2 +
 		yp_i * t +
 		y_i
 	);

test/interpolateSplineMonotone.test.js

@@ -0,0 +1,20 @@
+import tape from 'tape';
+import { samples, interpolateSplineMonotone } from '../src/index';
+
+tape('interpolateSplineMonotone', t => {
+	let data = [3, 2.8, 2.5, 1, 0.95, 0.8, 0.5, 0.1, 0.05];
+	t.deepEqual(samples(10).map(interpolateSplineMonotone()(data)), [
+		3,
+		2.826611796982167,
+		2.6089163237311386,
+		1.3592592592592596,
+		0.973593964334705,
+		0.8984224965706447,
+		0.7148148148148149,
+		0.40631001371742104,
+		0.09005486968449936,
+		0.049999999999999975
+	]);
+
+	t.end();
+});