Mean Value Theorem: Difference between revisions

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<html>
<jsxgraph width="600" height="400" box="box">
<link rel="stylesheet" type="text/css" href="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraph.css" />
var board = JXG.JSXGraph.initBoard('box', {boundingbox: [-5, 10, 7, -6], axis:true});
<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>
<script language="JavaScript">
        board = JXG.JSXGraph.initBoard('box', {originX: 250, originY: 250, unitX: 50, unitY: 25});
board.suspendUpdate();
board.suspendUpdate();
        // Axes
var p = [];
        xax = board.createElement('axis', [[0,0], [1,0]], {});
p[0] = board.create('point', [-1,-2], {size:2});
        yax = board.createElement('axis', [[0,0], [0,1]], {});
p[1] = board.create('point', [6,5], {size:2});
p[2] = board.create('point', [-0.5,1], {size:2});
p[3] = board.create('point', [3,3], {size:2});
var f = JXG.Math.Numerics.lagrangePolynomial(p);
var graph = board.create('functiongraph', [f,-10, 10]);


        var p = [];
var g = function(x) {
        p[0] = board.createElement('point', [-1,2], {style:4});
    return JXG.Math.Numerics.D(f)(x)-(p[1].Y()-p[0].Y())/(p[1].X()-p[0].X());
        p[1] = board.createElement('point', [6,2], {style:4});
};
        p[2] = board.createElement('point', [-0.5,1], {style:4});
        p[3] = board.createElement('point', [2,0.5], {style:4});
        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;
            };
    var graph = board.createElement('curve', ['x', f, 'x', -10, 10], {curveType:'graph'});


    var r = board.createElement('point', [
var r = board.create('glider', [
                     function() { return board.root(board.D(f)-(p[1].Y()-p[0].Y())/(p[1].X()-p[0].X()),(p[0].X()+p[1].X())*0.5); },
                     function() { return JXG.Math.Numerics.root(g,(p[0].X()+p[1].X())*0.5); },
                     function() { return f(board.root(board.D(f)-(p[1].Y()-p[0].Y())/(p[1].X()-p[0].X()),(p[0].X()+p[1].X())*0.5)); }],  
                     function() { return f(JXG.Math.Numerics.root(g,(p[0].X()+p[1].X())*0.5)); },
        {name:' ',style:6});
                    graph], {name:' ',size:4,fixed:true});
  var r2 = board.createElement('point', [function(){ return r.X()+0.01;},
board.create('tangent', [r], {strokeColor:'#ff0000'});
      function(){ return f(r.X()+0.01);}], {style:7,visible:false});
line = board.create('line',[p[0],p[1]],{strokeColor:'#ff0000',dash:1});


board.unsuspendUpdate();
</jsxgraph>
===The underlying JavaScript code===
<source lang="javascript">
var board = JXG.JSXGraph.initBoard('box', {boundingbox: [-5, 10, 7, -6], axis:true});
board.suspendUpdate();
var p = [];
p[0] = board.create('point', [-1,-2], {size:2});
p[1] = board.create('point', [6,5], {size:2});
p[2] = board.create('point', [-0.5,1], {size:2});
p[3] = board.create('point', [3,3], {size:2});
var f = JXG.Math.Numerics.lagrangePolynomial(p);
var graph = board.create('functiongraph', [f,-10, 10]);
var g = function(x) {
    return JXG.Math.Numerics.D(f)(x)-(p[1].Y()-p[0].Y())/(p[1].X()-p[0].X());
};


line = board.createElement('line',[r,r2],{strokeColor:'#ff0000'});
var r = board.create('glider', [
line = board.createElement('line',[p[0],p[1]],{strokeColor:'#ff0000',dash:1});
                    function() { return JXG.Math.Numerics.root(g,(p[0].X()+p[1].X())*0.5); },
                    function() { return f(JXG.Math.Numerics.root(g,(p[0].X()+p[1].X())*0.5)); },
                    graph], {name:' ',size:4,fixed:true});
board.create('tangent', [r], {strokeColor:'#ff0000'});
line = board.create('line',[p[0],p[1]],{strokeColor:'#ff0000',dash:1});


board.unsuspendUpdate();
board.unsuspendUpdate();
</script>
</source>
</html>


[[Category:Examples]]
[[Category:Examples]]
[[Category:Calculus]]
[[Category:Calculus]]

Latest revision as of 15:29, 20 February 2013

The underlying JavaScript code

var board = JXG.JSXGraph.initBoard('box', {boundingbox: [-5, 10, 7, -6], axis:true});
board.suspendUpdate();
var p = [];
p[0] = board.create('point', [-1,-2], {size:2});
p[1] = board.create('point', [6,5], {size:2});
p[2] = board.create('point', [-0.5,1], {size:2});
p[3] = board.create('point', [3,3], {size:2});
var f = JXG.Math.Numerics.lagrangePolynomial(p);
var graph = board.create('functiongraph', [f,-10, 10]);

var g = function(x) {
     return JXG.Math.Numerics.D(f)(x)-(p[1].Y()-p[0].Y())/(p[1].X()-p[0].X());
};

var r = board.create('glider', [
                    function() { return JXG.Math.Numerics.root(g,(p[0].X()+p[1].X())*0.5); },
                    function() { return f(JXG.Math.Numerics.root(g,(p[0].X()+p[1].X())*0.5)); },
                    graph], {name:' ',size:4,fixed:true});
board.create('tangent', [r], {strokeColor:'#ff0000'});
line = board.create('line',[p[0],p[1]],{strokeColor:'#ff0000',dash:1});

board.unsuspendUpdate();
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