Difference between revisions of "Elliptic curves"
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Jump to navigationJump to searchA WASSERMANN (talk | contribs) |
A WASSERMANN (talk | contribs) |
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Line 5: | Line 5: | ||
brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-15, 10, 15, -10], axis:true}); | brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-15, 10, 15, -10], axis:true}); | ||
brd.suspendUpdate(); | brd.suspendUpdate(); | ||
− | var b = brd.create('slider',[[1,-3],[10,-3],[-10, | + | var b = brd.create('slider',[[1,-3],[10,-3],[-10,-3,10]],{name:'a'}); |
var a = brd.create('slider',[[1,-4],[10,-4],[-10,0,10]],{name:'b'}); | var a = brd.create('slider',[[1,-4],[10,-4],[-10,0,10]],{name:'b'}); | ||
var c1 = brd.create('functiongraph', [function(x){ return Math.sqrt(x*x*x+a.Value()*x+b.Value()); }], | var c1 = brd.create('functiongraph', [function(x){ return Math.sqrt(x*x*x+a.Value()*x+b.Value()); }], | ||
{strokeWidth:3,strokeColor:'black'}); | {strokeWidth:3,strokeColor:'black'}); | ||
− | var c2 = brd.create('functiongraph', [function(x){ return -Math.sqrt(x*x*x+a.Value()*x+b.Value()); }], | + | //var c2 = brd.create('functiongraph', [function(x){ return -Math.sqrt(x*x*x+a.Value()*x+b.Value()); }], |
− | + | // {strokeWidth:3,strokeColor:'black'}); | |
brd.unsuspendUpdate(); | brd.unsuspendUpdate(); | ||
</jsxgraph> | </jsxgraph> |
Revision as of 12:18, 28 February 2014
An elliptic curve can be written as a plane algebraic curve defined by an equation of the form
- [math] y^2=x^3+ax+b\,. [/math]
JXG.Options.axis.strokeColor = '#cccccc';
brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-15, 10, 15, -10], axis:true});
brd.suspendUpdate();
var b = brd.create('slider',[[1,-3],[10,-3],[-10,0,10]],{name:'a'});
var a = brd.create('slider',[[1,-4],[10,-4],[-10,0,10]],{name:'b'});
var c1 = brd.create('functiongraph', [function(x){ return Math.sqrt(x*x*x+a.Value()*x+b.Value()); }],
{strokeWidth:3,strokeColor:'black'});
var c2 = brd.create('functiongraph', [function(x){ return -Math.sqrt(x*x*x+a.Value()*x+b.Value()); }],
{strokeWidth:3,strokeColor:'black'});
brd.unsuspendUpdate();