Shoelace formula for polygonal area: Difference between revisions
add RPL - optimized version
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OVER RE OVER IM * SWAP RE ROT IM * - +
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<span style="color:blue">'''SHOEL'''</span> ''( { (vertices) } → area ) ''
append 1st vertice at the end
get 2 vertices
sum += determinant
end loop
finalize calculation, clean stack
return area
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</pre>
=={{header|Ruby}}==
<syntaxhighlight lang="ruby">
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