From: Brandon S. Allbery KF8NH [mailto:allbery@ece.cmu.edu]
I was playing with that when your message came in:
mress:5003 Z$ cat foo.hs import Data.Fixed
data E2 = E2 instance HasResolution E2 where resolution _ = 100 type Money = Fixed E2
... *Main> :m +Data.List *Main Data.List> let l = [1.25 :: Money,2.00,4.46,12.80,1.15,6.00] in sum l / genericLength l 4.61
That what you want?
Yes... I'm now wondering how one would read Money values. There's a Show instance for Fixed, but no Read. Could use: readMoney :: String -> Money readMoney s = let d :: Double; d = read s in realToFrac d ... but is there a better way? Note that readMoney is a bit dumb: *Main> readMoney "3.149999" 3.14 Alistair ***************************************************************** Confidentiality Note: The information contained in this message, and any attachments, may contain confidential and/or privileged material. It is intended solely for the person(s) or entity to which it is addressed. Any review, retransmission, dissemination, or taking of any action in reliance upon this information by persons or entities other than the intended recipient(s) is prohibited. If you received this in error, please contact the sender and delete the material from any computer. *****************************************************************