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28 lines
962 B
JavaScript
28 lines
962 B
JavaScript
// Copyright 2009 the Sputnik authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/**
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* Closures are admitted
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*
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* @path ch13/13.2/S13.2.1_A5_T2.js
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* @description Returning a function that approximates the derivative of f
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* using an interval of dx, which should be appropriately small
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*/
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// Return a function that approximates the derivative of f
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// using an interval of dx, which should be appropriately small.
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function derivative(f, dx) {
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return function(x) {
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return (f(x + dx) - f(x)) / dx;
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};
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}
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//////////////////////////////////////////////////////////////////////////////
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//CHECK#1
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if (Math.abs(derivative(Math.sin, 0.0001)(0) - derivative(Math.sin, 0.0001)(2*Math.PI)) >= 1/65536.0) {
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$ERROR('#1: Math.abs(derivative(Math.sin, 0.0001)(0) - derivative(Math.sin, 0.0001)(2*Math.PI)) <= 1/65536.0');
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}
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//
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//////////////////////////////////////////////////////////////////////////////
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