From f661967db88f14531a7a7668aee87cc3c9df9989 Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Wed, 4 Sep 2019 17:46:49 -0400
Subject: reformat

---
 wolff.hs | 62 ++++++++++++++++++++++++++++++++++++++------------------------
 1 file changed, 38 insertions(+), 24 deletions(-)

diff --git a/wolff.hs b/wolff.hs
index 73687b5..1bbef3a 100644
--- a/wolff.hs
+++ b/wolff.hs
@@ -1,46 +1,60 @@
-
 {-# LANGUAGE MultiParamTypeClasses #-}
 
-import Data.Sequence
-import Data.Monoid
-import Data.Monoid.Action
-import Data.Group
+import Control.Monad.Mersenne.Random
 import Data.Char
 import Data.Graph
-import Control.Monad.Mersenne.Random
+import Data.Group
+import Data.Monoid
+import Data.Monoid.Action
+import Data.Sequence
 
-data Z2       = E0 | E1   deriving (Eq, Show)
-data Ising    = Up | Down deriving (Eq, Show)
+data Z2
+  = E0
+  | E1
+  deriving (Eq, Show)
+
+data Ising
+  = Up
+  | Down
+  deriving (Eq, Show)
 
 instance Semigroup Z2 where
-  -- Z2 is a semigroup
   E0 <> a = a
-  E1 <> a | a == E0   = E1
-          | otherwise = E0
+  E1 <> a
+    | a == E0 = E1
+    | otherwise = E0
 
 instance Monoid Z2 where
-  -- Z2 is a monoid
-  mempty      = E0
+  mempty = E0
   mappend a b = a <> b
 
 instance Group Z2 where
-  -- Z2 is a group
   invert = id
 
 instance Action Z2 Ising where
-  -- Z2 has an action on Ising spins
   act E0 a = a
-  act E1 a | a == Up   = Down
-           | otherwise = Up
+  act E1 a
+    | a == Up = Down
+    | otherwise = Up
 
-squareLatticeEdges d l = [(i, (l^j) * quot i (l^j) + mod (l^j + i + s * l^(j-1)) (l^j)) | j <- [1..d], i <- [0..(l^d)-1], s <- [-1, 1]]
-ghostEdges n = [(n, i) | i <- [0..n-1]] ++ [(i, n) | i <- [0..n-1]]
-squareLattice d l = buildG (0, l^d) ((squareLatticeEdges d l) ++ ghostEdges (l^d))
+squareLatticeEdges d l =
+  [ (i, (l ^ j) * quot i (l ^ j) + mod (l ^ j + i + s * l ^ (j - 1)) (l ^ j))
+  | j <- [1 .. d]
+  , i <- [0 .. (l ^ d) - 1]
+  , s <- [-1, 1]
+  ]
 
-data State r x = State { ghost :: r, spins :: Seq x }
+ghostEdges n = [(n, i) | i <- [0 .. n - 1]] ++ [(i, n) | i <- [0 .. n - 1]]
 
-j :: Ising -> Ising -> Integer
-j a b | a == b    =  1
-      | otherwise = -1
+squareLattice d l = buildG (0, l ^ d) ((squareLatticeEdges d l) ++ ghostEdges (l ^ d))
 
+data State r x =
+  State
+    { ghost :: r
+    , spins :: Seq x
+    }
 
+j :: Ising -> Ising -> Integer
+j a b
+  | a == b = 1
+  | otherwise = -1
-- 
cgit v1.2.3-70-g09d2