From 65eef4fade5eb426dae01d480f383b8a30b23071 Mon Sep 17 00:00:00 2001 From: Marshall Lochbaum Date: Wed, 11 Aug 2021 14:06:02 -0400 Subject: Change "BQN / main" in header to "(github) / BQN" --- docs/doc/reverse.html | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'docs/doc/reverse.html') diff --git a/docs/doc/reverse.html b/docs/doc/reverse.html index 4fc5165a..104a7e44 100644 --- a/docs/doc/reverse.html +++ b/docs/doc/reverse.html @@ -3,7 +3,7 @@ BQN: Reverse and Rotate -
BQN / main / doc
+
(github) / BQN / doc

Reverse and Rotate

The symbol ⌽ indicates two different array transformations: with no left argument, it reverses the major cells of the array, but with a left argument, it rotates or cycles them around. These two possibilities, first put together in very early versions of APL, can't be considered restrictions or different views of some unifying function, but there are connections between them. Each returns an array with the same shape and all the same elements as 𝕩, possibly in a different arrangement. And elements that start out next to each other in 𝕩 generally stay next to each other—always, if we consider an element on one edge to be next to the one opposite to it. One might think of them as isometries preserving a discrete subgroup of the torus, if one were inclined to think such things. On major cells, the two functions decompose the dihedral group okay I'll stop.

Many uses of Rotate in APL are better handled by shift functions in BQN. If there's no reason to treat the data as cyclic or periodic, it's best to avoid Rotate.

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