Riemann sum III: Difference between revisions

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Appromximate the integral of
<math>f: R\to R, x\mapsto x^2 </math>
<math>f: R\to R, x\mapsto x^2 </math>
<html>
<html>
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<jsxgraph width="800" height="400" box="box">
<jsxgraph width="800" height="400" box="box">
var brd = JXG.JSXGraph.initBoard('box', {axis:true, boundingbox:[-2,40,8,-5]});
var brd = JXG.JSXGraph.initBoard('box', {axis:true, boundingbox:[-2,40,8,-5]});
var s = brd.create('slider',[[1,30],[5,30],[1,50,500]],{name:'n',snapWidth:1});
var s = brd.create('slider',[[-1,30],[5,30],[3,50,500]],{name:'n',snapWidth:1});
var a = brd.create('slider',[[1,20],[5,20],[-10,0,0]],{name:'start'});
var a = brd.create('slider',[[-1,20],[3,20],[-10,0,0]],{name:'start'});
var b = brd.create('slider',[[1,10],[5,10],[0,6,10]],{name:'end'});
var b = brd.create('slider',[[-1,10],[3,10],[0,6,10]],{name:'end'});
var f = function(x){ return x*x; };
var f = function(x){ return x*x; };
var plot = brd.create('functiongraph',[f,function(){return a.Value();}, function(){return b.Value();}]);
var plot = brd.create('functiongraph',[f,function(){return a.Value();}, function(){return b.Value();}]);
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     ],  
     ],  
     {fillColor:'#ffff00', fillOpacity:0.3});
     {fillColor:'#ffff00', fillOpacity:0.3});
/*
 
brd.createElement('text',[-6,-4,function(){ return 'Sum='+(brd.riemannsum(f,s.Value(),document.getElementById('sumtype').value,a.Value(),b.Value())).toFixed(4); }]);
brd.createElement('text',[-6,-4,function(){ return 'Sum='+(brd.riemannsum(f,s.Value(),document.getElementById('sumtype').value,a.Value(),b.Value())).toFixed(4); }]);
*/
 
</jsxgraph>
</jsxgraph>



Revision as of 15:25, 2 February 2010

Appromximate the integral of [math]\displaystyle{ f: R\to R, x\mapsto x^2 }[/math]

Riemann sum type:

The underlying JavaScript code

<jsxgraph width="800" height="400" box="box">
</jsxgraph>