Continuous function II: Difference between revisions

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Line 1: Line 1:
<jsxgraph width="600" height="500" box="box">
<jsxgraph width="600" height="500" box="box">
  var board = JXG.JSXGraph.initBoard('box', {originX: 50, originY: 400, unitX: 50, unitY: 50});
  var board = JXG.JSXGraph.initBoard('box', {boundingbox: [-1, 10, 11, -2], axis: true});
var b1axisx = board.create('axis', [[0,0], [1,0]], {});
var b1axisy = board.create('axis', [[0,0], [0,1]], {});


  var f = function(x) { return 1.0/x; };
  var f = function(x) { return 1.0/x; };
Line 9: Line 7:
  var s = board.create('slider', [[0,-1],[4,-1],[0,1,1]],{name:'&epsilon;'});
  var s = board.create('slider', [[0,-1],[4,-1],[0,1,1]],{name:'&epsilon;'});


  var y1 = board.create('glider', [0,3,b1axisy],{name:'f(a)'});
  var y1 = board.create('glider', [0,3,board.defaultAxes.y],{name:'f(a)'});
  board.suspendUpdate();
  board.suspendUpdate();
  var y2 = board.create('point', [0,function(){return y1.Y()-s.Value();}],{style:7,name:' '});
  var y2 = board.create('point', [0,function(){return y1.Y()-s.Value();}],{size:2,face:'[]',name:' '});
  var y3 = board.create('point', [0,function(){return y1.Y()+s.Value();}],{style:7,name:' '});
  var y3 = board.create('point', [0,function(){return y1.Y()+s.Value();}],{size:2,face:'[]',name:' '});


  var z1 = board.create('point', [function(){return f(y1.Y());},function(){return y1.Y();}],{style:7,name:'f(a)'});
  var z1 = board.create('point', [function(){return f(y1.Y());},function(){return y1.Y();}],{size:2,face:'[]',name:'f(a)'});
  var z2 = board.create('point', [function(){return f(y2.Y());},function(){return y2.Y();}],{style:7,name:' '});
  var z2 = board.create('point', [function(){return f(y2.Y());},function(){return y2.Y();}],{size:2,face:'[]',name:' '});
  var z3 = board.create('point', [function(){return f(y3.Y());},function(){return y3.Y();}],{style:7,name:' '});
  var z3 = board.create('point', [function(){return f(y3.Y());},function(){return y3.Y();}],{size:2,face:'[]',name:' '});


  var v1 = board.create('line', [z1,y1],{strokeColor:'gray',dash:2,strokeWidth:1,straightFirst:false,straightLast:false});
  var v1 = board.create('segment', [z1,y1],{strokeColor:'gray',dash:2,strokeWidth:1});
  var v2 = board.create('line', [z2,y2],{strokeColor:'gray',dash:2,strokeWidth:1});
  var v2 = board.create('line', [z2,y2],{strokeColor:'gray',dash:2,strokeWidth:1});
  var v3 = board.create('line', [z3,y3],{strokeColor:'gray',dash:2,strokeWidth:1});
  var v3 = board.create('line', [z3,y3],{strokeColor:'gray',dash:2,strokeWidth:1});
Line 35: Line 33:


<source lang="javascript">
<source lang="javascript">
  var board = JXG.JSXGraph.initBoard('box', {originX: 50, originY: 400, unitX: 50, unitY: 50});
  var board = JXG.JSXGraph.initBoard('box', {boundingbox: [-1, 10, 11, -2], axis: true});
var b1axisx = board.create('axis', [[0,0], [1,0]], {});
var b1axisy = board.create('axis', [[0,0], [0,1]], {});


  var f = function(x) { return 1.0/x; };
  var f = function(x) { return 1.0/x; };
Line 44: Line 40:
  var s = board.create('slider', [[0,-1],[4,-1],[0,1,1]],{name:'&epsilon;'});
  var s = board.create('slider', [[0,-1],[4,-1],[0,1,1]],{name:'&epsilon;'});


  var y1 = board.create('glider', [0,3,b1axisy],{name:'f(a)'});
  var y1 = board.create('glider', [0,3,board.defaultAxes.y],{name:'f(a)'});
  board.suspendUpdate();
  board.suspendUpdate();
  var y2 = board.create('point', [0,function(){return y1.Y()-s.Value();}],{style:7,name:' '});
  var y2 = board.create('point', [0,function(){return y1.Y()-s.Value();}],{size:2,face:'[]',name:' '});
  var y3 = board.create('point', [0,function(){return y1.Y()+s.Value();}],{style:7,name:' '});
  var y3 = board.create('point', [0,function(){return y1.Y()+s.Value();}],{size:2,face:'[]',name:' '});


  var z1 = board.create('point', [function(){return f(y1.Y());},function(){return y1.Y();}],{style:7,name:'f(a)'});
  var z1 = board.create('point', [function(){return f(y1.Y());},function(){return y1.Y();}],{size:2,face:'[]',name:'f(a)'});
  var z2 = board.create('point', [function(){return f(y2.Y());},function(){return y2.Y();}],{style:7,name:' '});
  var z2 = board.create('point', [function(){return f(y2.Y());},function(){return y2.Y();}],{size:2,face:'[]',name:' '});
  var z3 = board.create('point', [function(){return f(y3.Y());},function(){return y3.Y();}],{style:7,name:' '});
  var z3 = board.create('point', [function(){return f(y3.Y());},function(){return y3.Y();}],{size:2,face:'[]',name:' '});


  var v1 = board.create('line', [z1,y1],{strokeColor:'gray',dash:2,strokeWidth:1,straightFirst:false,straightLast:false});
  var v1 = board.create('segment', [z1,y1],{strokeColor:'gray',dash:2,strokeWidth:1});
  var v2 = board.create('line', [z2,y2],{strokeColor:'gray',dash:2,strokeWidth:1});
  var v2 = board.create('line', [z2,y2],{strokeColor:'gray',dash:2,strokeWidth:1});
  var v3 = board.create('line', [z3,y3],{strokeColor:'gray',dash:2,strokeWidth:1});
  var v3 = board.create('line', [z3,y3],{strokeColor:'gray',dash:2,strokeWidth:1});

Revision as of 13:02, 7 June 2011

References

The underlying JavaScript code

 var board = JXG.JSXGraph.initBoard('box', {boundingbox: [-1, 10, 11, -2], axis: true});

 var f = function(x) { return 1.0/x; };
 var graph = board.create('functiongraph', [f,0.00001, 15], {strokeColor:'#00ff00'});

 var s = board.create('slider', [[0,-1],[4,-1],[0,1,1]],{name:'&epsilon;'});

 var y1 = board.create('glider', [0,3,board.defaultAxes.y],{name:'f(a)'});
 board.suspendUpdate();
 var y2 = board.create('point', [0,function(){return y1.Y()-s.Value();}],{size:2,face:'[]',name:' '});
 var y3 = board.create('point', [0,function(){return y1.Y()+s.Value();}],{size:2,face:'[]',name:' '});

 var z1 = board.create('point', [function(){return f(y1.Y());},function(){return y1.Y();}],{size:2,face:'[]',name:'f(a)'});
 var z2 = board.create('point', [function(){return f(y2.Y());},function(){return y2.Y();}],{size:2,face:'[]',name:' '});
 var z3 = board.create('point', [function(){return f(y3.Y());},function(){return y3.Y();}],{size:2,face:'[]',name:' '});

 var v1 = board.create('segment', [z1,y1],{strokeColor:'gray',dash:2,strokeWidth:1});
 var v2 = board.create('line', [z2,y2],{strokeColor:'gray',dash:2,strokeWidth:1});
 var v3 = board.create('line', [z3,y3],{strokeColor:'gray',dash:2,strokeWidth:1});

 var h1 = board.create('curve', [function(t){return z1.X();},function(t){return t},0,20], {strokeColor:'gray',dash:2,strokeWidth:1});
 var h2 = board.create('curve', [function(t){return z2.X();},function(t){return t},0,20], {strokeColor:'gray',dash:2,strokeWidth:1});
 var h3 = board.create('curve', [function(t){return z3.X();},function(t){return t},0,20], {strokeColor:'gray',dash:2,strokeWidth:1});
 board.unsuspendUpdate();
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