Shoelace formula for polygonal area: Difference between revisions
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<pre>30</pre> |
<pre>30</pre> |
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=={{header|min}}== |
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{{works with|min|0.19.3}} |
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<lang min>((((first) map) ((last) map)) cleave) :dezip |
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(((first) (rest)) cleave append) :rotate |
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((0 <) (-1 *) when) :abs |
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( |
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=b =a a size :n 0 :i () =list |
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(i n <) ( |
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a i get b i get ' prepend list append #list |
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i succ @i |
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) while list |
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) :rezip |
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(rezip (-> *) map sum) :cross-sum |
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( |
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((dezip rotate) (dezip swap rotate)) cleave |
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((id) (cross-sum) (id) (cross-sum)) spread |
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- abs 2 / |
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) :shoelace |
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((3 4) (5 11) (12 8) (9 5) (5 6)) shoelace print</lang> |
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<pre> |
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30.0 |
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</pre> |
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=={{header|Modula-2}}== |
=={{header|Modula-2}}== |
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