Riemann sums: Difference between revisions
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<html> | <html> | ||
<script type="text/javascript" src="http://korpelainen.net/js/AM1.js"></script> | <!--<script type="text/javascript" src="http://korpelainen.net/js/AM1.js"></script>--> | ||
</html> | </html> | ||
<html> | <html> | ||
<form>Riemann sum type: <select id="sumtype"> | <form>Riemann sum type: <select id="sumtype" onChange="brd.update();"> | ||
<option value='left' selected> left | <option value='left' selected> left | ||
<option value='right'> right | <option value='right'> right | ||
<option value='middle'> middle | <option value='middle'> middle | ||
<option value=' | <option value='trapezoidal'> trapezoidal | ||
<option value='simpson'> simpson | |||
<option value='lower'> lower | <option value='lower'> lower | ||
<option value='upper'> upper | <option value='upper'> upper | ||
</select></form> | </select></form> | ||
</html> | </html> | ||
<jsxgraph width="800" height="400" box="box"> | <jsxgraph width="800" height="400" box="box"> | ||
var brd = JXG.JSXGraph.initBoard('box', {axis:true, boundingbox: [-8, 4, 8, -4]}); | |||
var brd = JXG.JSXGraph.initBoard('box', {axis:true, | |||
var s = brd.create('slider',[[1,3],[5,3],[1,10,50]],{name:'n',snapWidth:1}); | var s = brd.create('slider',[[1,3],[5,3],[1,10,50]],{name:'n',snapWidth:1}); | ||
var a = brd.create('slider',[[1,2],[5,2],[-10,-3,0]],{name:'start'}); | var a = brd.create('slider',[[1,2],[5,2],[-10,-3,0]],{name:'start'}); | ||
| Line 30: | Line 29: | ||
{fillColor:'#ffff00', fillOpacity:0.3}); | {fillColor:'#ffff00', fillOpacity:0.3}); | ||
brd.create('text',[-6,-3,function(){ return 'Sum='+( | brd.create('text',[-6,-3,function(){ return 'Sum='+(JXG.Math.Numerics.riemannsum(f,s.Value(),document.getElementById('sumtype').value,a.Value(),b.Value())).toFixed(4); }]); | ||
</jsxgraph> | </jsxgraph> | ||
===The underlying JavaScript code=== | ===The underlying JavaScript code=== | ||
<source lang=" | <source lang="javascript"> | ||
var brd = JXG.JSXGraph.initBoard('box', {axis:true, boundingbox: [-8, 4, 8, -4]}); | |||
var brd = JXG.JSXGraph.initBoard('box', {axis:true, | |||
var s = brd.create('slider',[[1,3],[5,3],[1,10,50]],{name:'n',snapWidth:1}); | var s = brd.create('slider',[[1,3],[5,3],[1,10,50]],{name:'n',snapWidth:1}); | ||
var a = brd.create('slider',[[1,2],[5,2],[-10,-3,0]],{name:'start'}); | var a = brd.create('slider',[[1,2],[5,2],[-10,-3,0]],{name:'start'}); | ||
| Line 56: | Line 48: | ||
{fillColor:'#ffff00', fillOpacity:0.3}); | {fillColor:'#ffff00', fillOpacity:0.3}); | ||
brd.create('text',[-6,-3,function(){ return 'Sum='+( | brd.create('text',[-6,-3,function(){ return 'Sum='+(JXG.Math.Numerics.riemannsum(f,s.Value(),document.getElementById('sumtype').value,a.Value(),b.Value())).toFixed(4); }]); | ||
</source> | </source> | ||
[[Category:Examples]] | [[Category:Examples]] | ||
[[Category:Calculus]] | [[Category:Calculus]] | ||
Latest revision as of 13:50, 7 March 2024
The underlying JavaScript code
var brd = JXG.JSXGraph.initBoard('box', {axis:true, boundingbox: [-8, 4, 8, -4]});
var s = brd.create('slider',[[1,3],[5,3],[1,10,50]],{name:'n',snapWidth:1});
var a = brd.create('slider',[[1,2],[5,2],[-10,-3,0]],{name:'start'});
var b = brd.create('slider',[[1,1],[5,1],[0,Math.PI,10]],{name:'end'});
var f = function(x){ return Math.sin(x); };
var plot = brd.create('functiongraph',[f,function(){return a.Value();}, function(){return b.Value();}]);
var os = brd.create('riemannsum',[f,
function(){ return s.Value();}, function(){ return document.getElementById('sumtype').value;},
function(){return a.Value();},
function(){return b.Value();}
],
{fillColor:'#ffff00', fillOpacity:0.3});
brd.create('text',[-6,-3,function(){ return 'Sum='+(JXG.Math.Numerics.riemannsum(f,s.Value(),document.getElementById('sumtype').value,a.Value(),b.Value())).toFixed(4); }]);
