mapM2x()

Index syten::SQL::Helpers::mapM2x	(	int	x,
		int	y,
		int	l,
		int	w
	)

Meandering map flipped (2 sites):

y->
x  1  2 27 28 29 30
|  4  3 26 25 32 31
v  5  6 23 24 33 34
   8  7 22 21  .  .
   9 10 19 20  .  .
  12 11 18 17  .  .
  13 14 15 16  .  .

Parameters

x	length-coordinate, [0, l-1]
y	width-coordinate, [0, w-1]
l	length, [1, …)
w	width, [1, …)

Returns

0-indexed offset from the start if x != -1 != y and 0 denoting a non-diagonal lattice if x == -1 == y.

References mapM2().

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