Lituus: Difference between revisions
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A WASSERMANN (talk | contribs) (New page: a lituus is a spiral in which the angle is inversely proportional to the square of the radius (as expressed in polar coordinates). :<math>r^2\theta = k \,</math> <jsxgraph width="500" he...) |
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A lituus is a spiral in which the angle is inversely proportional to the square of the radius (as expressed in polar coordinates). | |||
:<math>r^2\theta = k \,</math> | :<math>r^2\theta = k \,</math> | ||
| Line 9: | Line 9: | ||
{curveType:'polar', strokewidth:4}); | {curveType:'polar', strokewidth:4}); | ||
</jsxgraph> | </jsxgraph> | ||
===The JavaScript code to produce this picture=== | |||
<source lang="xml"> | |||
<jsxgraph width="500" height="500" box="box1"> | |||
b1 = JXG.JSXGraph.initBoard('box1', {axis:true,originX: 250, originY: 250, unitX: 25, unitY: 25}); | |||
var k = b1.createElement('slider', [[1,8],[5,8],[0,1,4]]); | |||
var c = b1.createElement('curve', [function(phi){return Math.sqrt(k.Value()/phi); }, [0, 0],0, 8*Math.PI], | |||
{curveType:'polar', strokewidth:4}); | |||
</jsxgraph> | |||
</source> | |||
===External References=== | |||
* [http://en.wikipedia.org/wiki/Lituus_(mathematics) http://en.wikipedia.org/wiki/Lituus_(mathematics)] | |||
[[Category:Examples]] | [[Category:Examples]] | ||
[[Category:Curves]] | [[Category:Curves]] | ||
Revision as of 08:08, 18 March 2009
A lituus is a spiral in which the angle is inversely proportional to the square of the radius (as expressed in polar coordinates).
- [math]\displaystyle{ r^2\theta = k \, }[/math]
The JavaScript code to produce this picture
<jsxgraph width="500" height="500" box="box1">
b1 = JXG.JSXGraph.initBoard('box1', {axis:true,originX: 250, originY: 250, unitX: 25, unitY: 25});
var k = b1.createElement('slider', [[1,8],[5,8],[0,1,4]]);
var c = b1.createElement('curve', [function(phi){return Math.sqrt(k.Value()/phi); }, [0, 0],0, 8*Math.PI],
{curveType:'polar', strokewidth:4});
</jsxgraph>
