Lagrange interpolation: Difference between revisions

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(New page: Constructs a polynomial of degree <math>n</math> through <math>n+1</math> given points. Points can be added by clicking on "Add point". <html> <link rel="stylesheet" type="text/css" href="...)
 
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         p[0] = board.createElement('point', [-1,2], {style:6});
         p[0] = board.createElement('point', [-1,2], {style:6});
         p[1] = board.createElement('point', [3,-1], {style:6});
         p[1] = board.createElement('point', [3,-1], {style:6});
         var polynomial = function(x) {
         var f = function(x) {
                 var i;
                 var i;
                 var y = 0.0;
                 var y = 0.0;
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                 return y;
                 return y;
             };
             };
         graph = board.createElement('curve', ['x', polynomial, 'x', -10, 10], {curveType:'graph'});
         graph = board.createElement('curve', ['x', f, 'x', -10, 10], {curveType:'graph'});
        d1 = board.createElement('curve', ['x', board.D(f), 'x', -10, 10], {curveType:'graph'});


         function addPoint() {
         function addPoint() {

Revision as of 11:13, 23 January 2009

Constructs a polynomial of degree [math]\displaystyle{ n }[/math] through [math]\displaystyle{ n+1 }[/math] given points. Points can be added by clicking on "Add point".

References

The underlying JavaScript code

<link rel="stylesheet" type="text/css" href="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraph.css" />
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/prototype.js"></script>
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraphcore.js"></script>
<div id="box" class="jxgbox" style="width:600px; height:400px;"></div>
        board = JXG.JSXGraph.initBoard('box', {originX: 250, originY: 250, unitX: 50, unitY: 25});
        // Axes
        b1axisx = board.createElement('axis', [[0,0], [1,0]], {});
        b1axisy = board.createElement('axis', [[0,0], [0,1]], {});

        var p = [];
        p[0] = board.createElement('point', [-1,2], {style:6});
        p[1] = board.createElement('point', [3,-1], {style:6});
        
        var f = function(x) {
                var i;
                var y = 0.0;
                var xc = [];
                for (i=0;i<p.length;i++) {
                  xc[i] = p[i].X();
                }
                for (i=0;i<p.length;i++) {
                  var t = p[i].Y();
                  for (var k=0;k<p.length;k++) {
                    if (k!=i) {
                      t *= (x-xc[k])/(xc[i]-xc[k]);
                    }
                  }
                  y += t;
                }
                return y;
            };
        graph = board.createElement('curve', ['x', f, 'x', -10, 10], {curveType:'graph'});

        function addPoint() {
          p.push(board.createElement('point',[(Math.random()-0.5)*10,(Math.random()-0.5)*3],{style:6}));
          board.update();
        }