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| <head> |
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| Copyright (C) 2007 Apple Inc. All rights reserved. |
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| |
| <title>SunSpider math-spectral-norm</title> |
| <link rel="stylesheet" href="sunspider.css"> |
| </head> |
| |
| <body> |
| <h3>math-spectral-norm</h3> |
| <div id="console"> |
| </div> |
| <script src="sunspider-record-result.js"></script> |
| <script> |
| |
| var _sunSpiderStartDate = new Date(); |
| |
| // The Great Computer Language Shootout |
| // http://shootout.alioth.debian.org/ |
| // |
| // contributed by Ian Osgood |
| |
| function A(i,j) { |
| return 1/((i+j)*(i+j+1)/2+i+1); |
| } |
| |
| function Au(u,v) { |
| for (var i=0; i<u.length; ++i) { |
| var t = 0; |
| for (var j=0; j<u.length; ++j) |
| t += A(i,j) * u[j]; |
| v[i] = t; |
| } |
| } |
| |
| function Atu(u,v) { |
| for (var i=0; i<u.length; ++i) { |
| var t = 0; |
| for (var j=0; j<u.length; ++j) |
| t += A(j,i) * u[j]; |
| v[i] = t; |
| } |
| } |
| |
| function AtAu(u,v,w) { |
| Au(u,w); |
| Atu(w,v); |
| } |
| |
| function spectralnorm(n) { |
| var i, u=[], v=[], w=[], vv=0, vBv=0; |
| for (i=0; i<n; ++i) { |
| u[i] = 1; v[i] = w[i] = 0; |
| } |
| for (i=0; i<10; ++i) { |
| AtAu(u,v,w); |
| AtAu(v,u,w); |
| } |
| for (i=0; i<n; ++i) { |
| vBv += u[i]*v[i]; |
| vv += v[i]*v[i]; |
| } |
| return Math.sqrt(vBv/vv); |
| } |
| |
| for (var i = 6; i <= 48; i *= 2) { |
| spectralnorm(i); |
| } |
| |
| |
| var _sunSpiderInterval = new Date() - _sunSpiderStartDate; |
| |
| record(_sunSpiderInterval); |
| </script> |
| |
| |
| </body> |
| </html> |
