Difference between revisions of "Power Series for sine and cosine"

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Line 36: Line 36:
 
</html>
 
</html>
 
<source lang="javascript">
 
<source lang="javascript">
 +
board1 = JXG.JSXGraph.initBoard('jxgbox1', {originX: 300, originY: 150, unitX: 50, unitY: 50});
 +
board1.suspendUpdate();
 +
board1.createElement('axis', [[1,0], [0,0]], {});
 +
board1.createElement('axis', [[0,1], [0,0]], {});
 +
board1.createElement('curve', [function(t){ return t; }, function(t){ return Math.sin(t); }, "t", -10, 10],{strokeColor: "#cccccc"});
 +
var s = board1.createElement('slider', [0.75,-2.5,5,0,10,0], {name:'S'});
 +
board1.createElement('curve', [
 +
  function(t){ return t; },
 +
  function(t) {
 +
    var val = 0;
 +
    for(var i = 0; i < Math.floor(s.X()) + 1; i++) {
 +
      var f = 1;
 +
      var n = 1;
 +
      while (n <= 2 * i + 1) { f = f * n++; }
 +
        val = val + Math.pow(-1, i) * Math.pow(t, 2 * i + 1) / f;
 +
      }
 +
      return val;
 +
    }, "t", -10, 10], {strokeColor: "#bb0000"});
 +
board1.unsuspendUpdate();
 
</source>
 
</source>
  
Line 70: Line 89:
 
</html>
 
</html>
 
<source lang="javascript">
 
<source lang="javascript">
 +
board2 = JXG.JSXGraph.initBoard('jxgbox2', {originX: 300, originY: 150, unitX: 50, unitY: 50});
 +
board2.suspendUpdate();
 +
board2.createElement('axis', [[1,0], [0,0]], {});
 +
board2.createElement('axis', [[0,1], [0,0]], {});
 +
board2.createElement('curve', [function(t){ return t; }, function(t){ return Math.cos(t); }, "t", -10, 10],{strokeColor: "#cccccc"});
 +
var s2 = board2.createElement('slider', [0.75,-2.5,5,0,10,0], {name:'T'});
 +
board2.createElement('curve', [
 +
function(t){ return t; },
 +
function(t) {
 +
var val = 0;
 +
for(var i = 0; i < Math.floor(s2.X()) + 1; i++) {
 +
var f = 1;
 +
var n = 1;
 +
while (n <= 2 * i) { f = f * n++; }
 +
  val = val + Math.pow(-1, i) * Math.pow(t, 2 * i) / f;
 +
}
 +
return val;
 +
}, "t", -10, 10],{strokeColor: "#009900"});
 +
board2.unsuspendUpdate();
 
</source>
 
</source>
  
 
[[Category:Examples]]
 
[[Category:Examples]]

Revision as of 12:31, 17 September 2008

Power Series for Sine

board1 = JXG.JSXGraph.initBoard('jxgbox1', {originX: 300, originY: 150, unitX: 50, unitY: 50});
board1.suspendUpdate();
board1.createElement('axis', [[1,0], [0,0]], {});
board1.createElement('axis', [[0,1], [0,0]], {});
board1.createElement('curve', [function(t){ return t; }, function(t){ return Math.sin(t); }, "t", -10, 10],{strokeColor: "#cccccc"});
var s = board1.createElement('slider', [0.75,-2.5,5,0,10,0], {name:'S'});
board1.createElement('curve', [
  function(t){ return t; }, 
  function(t) {
    var val = 0;
    for(var i = 0; i < Math.floor(s.X()) + 1; i++) {
      var f = 1;
      var n = 1;
      while (n <= 2 * i + 1) { f = f * n++; }
        val = val + Math.pow(-1, i) * Math.pow(t, 2 * i + 1) / f;
      }
      return val;
    }, "t", -10, 10], {strokeColor: "#bb0000"});
board1.unsuspendUpdate();

Power Series for Cosine

board2 = JXG.JSXGraph.initBoard('jxgbox2', {originX: 300, originY: 150, unitX: 50, unitY: 50});
board2.suspendUpdate();
board2.createElement('axis', [[1,0], [0,0]], {});
board2.createElement('axis', [[0,1], [0,0]], {});
board2.createElement('curve', [function(t){ return t; }, function(t){ return Math.cos(t); }, "t", -10, 10],{strokeColor: "#cccccc"});
var s2 = board2.createElement('slider', [0.75,-2.5,5,0,10,0], {name:'T'});
board2.createElement('curve', [
	function(t){ return t; }, 
	function(t) {
		var val = 0;
		for(var i = 0; i < Math.floor(s2.X()) + 1; i++) {
			var f = 1;
			var n = 1;
			while (n <= 2 * i) { f = f * n++; }
   			val = val + Math.pow(-1, i) * Math.pow(t, 2 * i) / f;
		}
		return val;
	}, "t", -10, 10],{strokeColor: "#009900"});						
board2.unsuspendUpdate();