testing/performance/talos/page_load_test/sunspider/math-spectral-norm.html

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  27
  28 <title>SunSpider math-spectral-norm</title>
  29 <link rel="stylesheet" href="sunspider.css"></link>
  30 </head>
  31
  32 <body>
  33 <h3>math-spectral-norm</h3>
  34 <div id="console">
  35 </div>
  36 <script>
  37
  38
  39 // The Great Computer Language Shootout
  40 // http://shootout.alioth.debian.org/
  41 //
  42 // contributed by Ian Osgood
  43
  44 function A(i,j) {
  45   return 1/((i+j)*(i+j+1)/2+i+1);
  46 }
  47
  48 function Au(u,v) {
  49   for (var i=0; i<u.length; ++i) {
  50     var t = 0;
  51     for (var j=0; j<u.length; ++j)
  52       t += A(i,j) * u[j];
  53     v[i] = t;
  54   }
  55 }
  56
  57 function Atu(u,v) {
  58   for (var i=0; i<u.length; ++i) {
  59     var t = 0;
  60     for (var j=0; j<u.length; ++j)
  61       t += A(j,i) * u[j];
  62     v[i] = t;
  63   }
  64 }
  65
  66 function AtAu(u,v,w) {
  67   Au(u,w);
  68   Atu(w,v);
  69 }
  70
  71 function spectralnorm(n) {
  72   var i, u=[], v=[], w=[], vv=0, vBv=0;
  73   for (i=0; i<n; ++i) {
  74     u[i] = 1; v[i] = w[i] = 0;
  75   }
  76   for (i=0; i<10; ++i) {
  77     AtAu(u,v,w);
  78     AtAu(v,u,w);
  79   }
  80   for (i=0; i<n; ++i) {
  81     vBv += u[i]*v[i];
  82     vv  += v[i]*v[i];
  83   }
  84   return Math.sqrt(vBv/vv);
  85 }
  86
  87 for (var i = 6; i <= 48; i *= 2) {
  88     spectralnorm(i);
  89 }
  90
  91
  92
  93 </script>
  94
  95
  96 </body>
  97 </html>