# Difference between revisions of "Dual lattice"

From JSXGraph Wiki

A WASSERMANN (talk | contribs) |
A WASSERMANN (talk | contribs) |
||

Line 9: | Line 9: | ||

w1 = brd.create('arrow', [[0,0], function() { | w1 = brd.create('arrow', [[0,0], function() { | ||

var num = b1.X() * b2.Y() - b2.X() * b1.Y(); | var num = b1.X() * b2.Y() - b2.X() * b1.Y(); | ||

− | |||

return [b2.Y() / num, -b2.X() / num]; | return [b2.Y() / num, -b2.X() / num]; | ||

+ | }], {strokeColor: 'red'}); | ||

− | }], {strokeColor: ' | + | w2 = brd.create('arrow', [[0,0], function() { |

+ | var num = b1.X() * b2.Y() - b2.X() * b1.Y(); | ||

+ | return [-b1.Y() / num, b1.X() / num]; | ||

+ | }], {strokeColor: 'black'}); | ||