aboutsummaryrefslogtreecommitdiff
path: root/contexts/data/lib/closure-library/closure/goog/math/interpolator/pchip1.js
diff options
context:
space:
mode:
Diffstat (limited to 'contexts/data/lib/closure-library/closure/goog/math/interpolator/pchip1.js')
-rw-r--r--contexts/data/lib/closure-library/closure/goog/math/interpolator/pchip1.js81
1 files changed, 0 insertions, 81 deletions
diff --git a/contexts/data/lib/closure-library/closure/goog/math/interpolator/pchip1.js b/contexts/data/lib/closure-library/closure/goog/math/interpolator/pchip1.js
deleted file mode 100644
index 40184c7..0000000
--- a/contexts/data/lib/closure-library/closure/goog/math/interpolator/pchip1.js
+++ /dev/null
@@ -1,81 +0,0 @@
-// Copyright 2012 The Closure Library Authors. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS-IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-/**
- * @fileoverview A one dimensional monotone cubic spline interpolator.
- *
- * See http://en.wikipedia.org/wiki/Monotone_cubic_interpolation.
- *
- */
-
-goog.provide('goog.math.interpolator.Pchip1');
-
-goog.require('goog.math');
-goog.require('goog.math.interpolator.Spline1');
-
-
-
-/**
- * A one dimensional monotone cubic spline interpolator.
- * @extends {goog.math.interpolator.Spline1}
- * @constructor
- */
-goog.math.interpolator.Pchip1 = function() {
- goog.base(this);
-};
-goog.inherits(goog.math.interpolator.Pchip1, goog.math.interpolator.Spline1);
-
-
-/** @override */
-goog.math.interpolator.Pchip1.prototype.computeDerivatives = function(
- dx, slope) {
- var len = dx.length;
- var deriv = new Array(len + 1);
- for (var i = 1; i < len; ++i) {
- if (goog.math.sign(slope[i - 1]) * goog.math.sign(slope[i]) <= 0) {
- deriv[i] = 0;
- } else {
- var w1 = 2 * dx[i] + dx[i - 1];
- var w2 = dx[i] + 2 * dx[i - 1];
- deriv[i] = (w1 + w2) / (w1 / slope[i - 1] + w2 / slope[i]);
- }
- }
- deriv[0] = this.computeDerivativeAtBoundary_(
- dx[0], dx[1], slope[0], slope[1]);
- deriv[len] = this.computeDerivativeAtBoundary_(
- dx[len - 1], dx[len - 2], slope[len - 1], slope[len - 2]);
- return deriv;
-};
-
-
-/**
- * Computes the derivative of a data point at a boundary.
- * @param {number} dx0 The spacing of the 1st data point.
- * @param {number} dx1 The spacing of the 2nd data point.
- * @param {number} slope0 The slope of the 1st data point.
- * @param {number} slope1 The slope of the 2nd data point.
- * @return {number} The derivative at the 1st data point.
- * @private
- */
-goog.math.interpolator.Pchip1.prototype.computeDerivativeAtBoundary_ = function(
- dx0, dx1, slope0, slope1) {
- var deriv = ((2 * dx0 + dx1) * slope0 - dx0 * slope1) / (dx0 + dx1);
- if (goog.math.sign(deriv) != goog.math.sign(slope0)) {
- deriv = 0;
- } else if (goog.math.sign(slope0) != goog.math.sign(slope1) &&
- Math.abs(deriv) > Math.abs(3 * slope0)) {
- deriv = 3 * slope0;
- }
- return deriv;
-};