Difference between revisions of "Lagrange interpolation (dup)"

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Line 45: Line 45:
 
         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});
 +
        p[2] = board.createElement('point', [-3,0], {style:6});
 
          
 
          
 
         graph = board.createElement('functiongraph', [board.lagrangePolynomial(p), -10, 10]);
 
         graph = board.createElement('functiongraph', [board.lagrangePolynomial(p), -10, 10]);

Revision as of 18:18, 25 March 2009

Constructs a polynomial of degree [math]n[/math] through [math]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});
        p[2] = board.createElement('point', [-3,0], {style:6});
        
        graph = board.createElement('functiongraph', [board.lagrangePolynomial(p), -10, 10]);

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