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-<!DOCTYPE html>
-<html>
-<!--
-Copyright 2011 The Closure Library Authors. All Rights Reserved.
-
-Use of this source code is governed by the Apache License, Version 2.0.
-See the COPYING file for details.
--->
-<head>
-<meta http-equiv="X-UA-Compatible" content="IE=edge">
-<title>Closure Unit Tests - goog.math.interpolator.Linear1</title>
-<script src="../../base.js"></script>
-<script>
- goog.require('goog.math.interpolator.Linear1');
- goog.require('goog.testing.jsunit');
-</script>
-</head>
-<body>
-<script>
-
- function testLinear() {
- // Test special case with no data to interpolate.
- var x = [];
- var y = [];
- var interp = new goog.math.interpolator.Linear1();
- interp.setData(x, y);
- assertTrue(isNaN(interp.interpolate(1)));
-
- // Test special case with 1 data point.
- x = [0];
- y = [3];
- interp = new goog.math.interpolator.Linear1();
- interp.setData(x, y);
- assertRoughlyEquals(3, interp.interpolate(1), 1e-4);
-
- // Test general case.
- x = [0, 1, 3, 6, 7];
- y = [0, 0, 0, 0, 0];
- for (var i = 0; i < x.length; ++i) {
- y[i] = Math.sin(x[i]);
- }
- interp = new goog.math.interpolator.Linear1();
- interp.setData(x, y);
-
- var xi = [0, 0.5, 1, 2, 3, 4, 5, 6, 7];
- var expected = [0, 0.4207, 0.8415, 0.4913, 0.1411, 0.0009, -0.1392,
- -0.2794, 0.657];
- var result = [0, 0, 0, 0, 0, 0, 0, 0, 0];
- for (var i = 0; i < xi.length; ++i) {
- result[i] = interp.interpolate(xi[i]);
- }
- assertElementsRoughlyEqual(expected, result, 1e-4);
- };
-
-
- function testOutOfBounds() {
- var x = [0, 1, 2];
- var y = [2, 5, 4];
- var interp = new goog.math.interpolator.Linear1();
- interp.setData(x, y);
- assertRoughlyEquals(interp.interpolate(-1), -1, 1e-4);
- assertRoughlyEquals(interp.interpolate(4), 2, 1e-4);
- };
-
-
- function testInverse() {
- var x = [0, 1, 3, 6, 7];
- var y = [0, 2, 7, 8, 10];
-
- var interp = new goog.math.interpolator.Linear1();
- interp.setData(x, y);
- var invInterp = interp.getInverse();
-
- var xi = [0, 0.5, 1, 2, 3, 4, 5, 6, 7];
- var yi = [0, 1, 2, 4.5, 7, 7.3333, 7.6667, 8, 10];
- var resultX = [0, 0, 0, 0, 0, 0, 0, 0, 0];
- var resultY = [0, 0, 0, 0, 0, 0, 0, 0, 0];
- for (var i = 0; i < xi.length; ++i) {
- resultY[i] = interp.interpolate(xi[i]);
- resultX[i] = invInterp.interpolate(yi[i]);
- }
- assertElementsRoughlyEqual(xi, resultX, 1e-4);
- assertElementsRoughlyEqual(yi, resultY, 1e-4);
- };
-
-</script>
-</body>