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