Method code for $math.rectangular_cylindrical()

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arg coords;
var a;

a = atan2(coords[2], coords[1]);
if (a < 0)
    a += pi2;
return [.distance(coords.subrange(1, 2), origin_2d), a, coords[3]];

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// Miroslav Silovic
// Created 19-Oct-1996 as a part of ColdCore, see: @help Credit