Riemann sum III: Difference between revisions

Revision as of 15:25, 2 February 2010

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

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

@@ Line 1: / Line 1: @@
+Appromximate the integral of
 <math>f: R\to R, x\mapsto x^2 </math>
 <html>
@@ Line 12: / Line 13: @@
 <jsxgraph width="800" height="400" box="box">
 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 plot = brd.create('functiongraph',[f,function(){return a.Value();}, function(){return b.Value();}]);
@@ Line 24: / Line 25: @@
      ],
      {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); }]);
-*/
 </jsxgraph>