Difference between revisions of "Dual lattice"
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A WASSERMANN (talk | contribs) |
A WASSERMANN (talk | contribs) |
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w1 = brd.create('arrow', [[0,0], function() { | w1 = brd.create('arrow', [[0,0], function() { | ||
| − | + | var num = b1.X() * b2.Y() - b2.X() * b1.Y(); | |
| − | }], {}); | + | return [b2.Y() / num, -b2.X() / num]; |
| + | |||
| + | }], {strokeColor: 'red'}); | ||
