X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2FIntegration%2FTrapezoid.hs;h=df4da781b6cea30e7fbe763ee20da9ba85549db7;hb=7638f1a379035c045185e25cacf0ea2d9d257265;hp=444d92d2eb9a0ed2e6911970f54cd88aafd71b3a;hpb=2f54e89d36e835c58efcc281741632d457859b20;p=numerical-analysis.git

diff --git a/src/Integration/Trapezoid.hs b/src/Integration/Trapezoid.hs
index 444d92d..df4da78 100644
--- a/src/Integration/Trapezoid.hs
+++ b/src/Integration/Trapezoid.hs
@@ -1,15 +1,19 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE RebindableSyntax #-}
 
-module Integration.Trapezoid
+module Integration.Trapezoid (
+  trapezoid,
+  trapezoid_1 )
 where
 
-import Misc (partition)
+import Misc ( partition )
+
+import NumericPrelude hiding ( abs )
+import qualified Algebra.Field as Field ( C )
+import qualified Algebra.RealField as RealField ( C )
+import qualified Algebra.ToInteger as ToInteger ( C )
+import qualified Algebra.ToRational as ToRational ( C )
 
-import NumericPrelude hiding (abs)
-import qualified Algebra.Field as Field
-import qualified Algebra.RealField as RealField
-import qualified Algebra.ToInteger as ToInteger
-import qualified Algebra.ToRational as ToRational
 
 -- | Use the trapezoid rule to numerically integrate @f@ over the
 --   interval [@a@, @b@].
@@ -38,8 +42,9 @@ trapezoid_1 :: (Field.C a, ToRational.C a, Field.C b)
             -> a       -- ^ The \"right\" endpoint, @b@
             -> b
 trapezoid_1 f a b =
-  (((f a) + (f b)) / 2) * (fromRational' $ toRational (b - a))
-
+  (((f a) + (f b)) / 2) * coerced_interval_length
+  where
+    coerced_interval_length = fromRational' $ toRational (b - a)
 
 -- | Use the composite trapezoid rule to numerically integrate @f@
 --   over @n@ subintervals of [@a@, @b@].