14 Aug
2011
14 Aug
'11
4:15 p.m.
On Sun, Aug 14, 2011 at 12:44 PM, Yitzchak Gale
Malcolm Wallace wrote:
For instance, although I can guess at "sconcat", what semantics is "replicate1p" supposed to have?
A semigroup is just an associative operator. sconcat is analogous to mconcat, providing a potentially optimized traversal over a non-empty list. Not necessarily in theory, but in practice quite useful. replicate1p needs to be renamed, but it repeats an element (n + 1) times using peasant multiplication, taking advantage of the associativity to get away with using (<>) only log n times. replicate1p 0 a = a replicate1p 1 a = a <> a replicate1p 3 a = (a <> a) <> (a <> a) etc. I am happy to spend some time working on the documentation. -Edward