# Difference between revisions of "Elliptic curves"

From JSXGraph Wiki

Jump to navigationJump to searchA WASSERMANN (talk | contribs) |
A WASSERMANN (talk | contribs) |
||

(3 intermediate revisions by the same user not shown) | |||

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],[-10,2.10,10]],{name:'a'}); |

− | var a = brd.create('slider',[[1,-4],[10,-4],[-10, | + | var a = brd.create('slider',[[1,-4],[10,-4],[-10,-9.52,10]],{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()); }], |

## Latest revision as of 13:42, 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();
```