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102 lines
2.5 KiB
HTML
102 lines
2.5 KiB
HTML
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<!DOCTYPE html>
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<head>
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<!--
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Copyright (C) 2007 Apple Inc. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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-->
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<title>SunSpider math-spectral-norm</title>
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</head>
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<body>
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<h3>math-spectral-norm</h3>
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<div id="console">
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</div>
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<script>
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var _sunSpiderStartDate = new Date();
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// The Great Computer Language Shootout
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// http://shootout.alioth.debian.org/
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//
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// contributed by Ian Osgood
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function A(i,j) {
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return 1/((i+j)*(i+j+1)/2+i+1);
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}
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function Au(u,v) {
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for (var i=0; i<u.length; ++i) {
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var t = 0;
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for (var j=0; j<u.length; ++j)
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t += A(i,j) * u[j];
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v[i] = t;
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}
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}
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function Atu(u,v) {
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for (var i=0; i<u.length; ++i) {
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var t = 0;
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for (var j=0; j<u.length; ++j)
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t += A(j,i) * u[j];
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v[i] = t;
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}
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}
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function AtAu(u,v,w) {
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Au(u,w);
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Atu(w,v);
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}
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function spectralnorm(n) {
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var i, u=[], v=[], w=[], vv=0, vBv=0;
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for (i=0; i<n; ++i) {
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u[i] = 1; v[i] = w[i] = 0;
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}
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for (i=0; i<10; ++i) {
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AtAu(u,v,w);
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AtAu(v,u,w);
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}
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for (i=0; i<n; ++i) {
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vBv += u[i]*v[i];
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vv += v[i]*v[i];
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}
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return Math.sqrt(vBv/vv);
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}
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for (var i = 6; i <= 48; i *= 2) {
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spectralnorm(i);
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}
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var _sunSpiderInterval = new Date() - _sunSpiderStartDate;
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document.getElementById("console").innerHTML = _sunSpiderInterval;
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</script>
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</body>
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</html>
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