Subversion Repositories wimsdev

var addPoint = function(x) {
  p.push(brd.create('point',
              [x,(Math.random()-0.5)*3],{style:6}));
  brd.update();
};
 
var brd = JXG.JSXGraph.initBoard('jsxbox',
           {axis:true,originX: 250, originY: 250, unitX: 50, unitY: 25});
brd.suspendUpdate();
var p = [];
p[0] = brd.create('point', [-4,2], {style:6});
p[1] = brd.create('point', [3,-1], {style:6});
addPoint(-2);
addPoint(0.5);
addPoint(1);
var pol = brd.lagrangePolynomial(p);
var g = brd.create('functiongraph', [pol, -10, 10], {strokeWidth:3});
var g2 = brd.create('functiongraph', [brd.D(pol), -10, 10],
                                      {dash:3, strokeColor:'#ff0000'});
brd.unsuspendUpdate();