# Difference between revisions of "Elliptic curves"

From JSXGraph Wiki

A WASSERMANN (talk | contribs) |
A WASSERMANN (talk | contribs) |
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An elliptic curve can be written as a plane algebraic curve defined by an equation of the form | 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> | :<math> y^2=x^3+ax+b\,. </math> | ||

− | <jsxgraph width="600" height="400" box=" | + | <jsxgraph width="600" height="400" box="jxgbox"> |

JXG.Options.axis.strokeColor = '#cccccc'; | JXG.Options.axis.strokeColor = '#cccccc'; | ||

brd = JXG.JSXGraph.initBoard('jxgbox', {originX: 300, originY: 200, unitX: 20, unitY: 20, axis:true}); | brd = JXG.JSXGraph.initBoard('jxgbox', {originX: 300, originY: 200, unitX: 20, unitY: 20, axis:true}); | ||

Line 16: | Line 16: | ||

<source lang="javascript"> | <source lang="javascript"> | ||

− | |||

JXG.Options.axis.strokeColor = '#cccccc'; | JXG.Options.axis.strokeColor = '#cccccc'; | ||

brd = JXG.JSXGraph.initBoard('jxgbox', {originX: 300, originY: 200, unitX: 20, unitY: 20, axis:true}); |

## Revision as of 13:04, 25 March 2011

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', {originX: 300, originY: 200, unitX: 20, unitY: 20, 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();
```