Riemann sum III: Difference between revisions
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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],[ | var s = brd.create('slider',[[-1,30],[2,30],[3,50,500]],{name:'n',snapWidth:1}); | ||
var a = brd.create('slider',[[-1,20],[ | var a = brd.create('slider',[[-1,20],[2,20],[-10,0,0]],{name:'start'}); | ||
var b = brd.create('slider',[[-1,10],[ | var b = brd.create('slider',[[-1,10],[2,10],[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',[- | brd.createElement('text',[-1,35,function(){ return 'Sum='+(brd.riemannsum(f,s.Value(),document.getElementById('sumtype').value,a.Value(),b.Value())).toFixed(4); }]); | ||
</jsxgraph> | </jsxgraph> | ||
Revision as of 15:26, 2 February 2010
Appromximate the integral of [math]\displaystyle{ f: R\to R, x\mapsto x^2 }[/math]
The underlying JavaScript code
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</jsxgraph>
