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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.js | 81 |
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; -}; |