Logs: freenode/#haskell

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2021-04-13 12:36:47	<lambdabot>	ap
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2021-04-13 12:40:50	<ddk>	?
2021-04-13 12:41:33	<merijn>	You should figure out how you want/have to store things in postgres and then find out how to use that using postgres-simple, I'd say?
2021-04-13 12:42:33	<merijn>	Seems to me the Database.PostgreSQL.Simple.Time has more than you'd ever want to know on the topic?
2021-04-13 12:42:52	<merijn>	Also: Don't store future times in UTC
2021-04-13 12:45:19	<ddk>	merijn: using `TIMESTAMP WITH TIME ZONE` in postgres, I'm not sure whether I can directly parse them in Haskell
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2021-04-13 13:02:55	<Komrad_Kafuka>	Hi
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2021-04-13 13:05:19	<Komrad_Kafuka>	I've been recently learning haskell and it's a little hard but great. I was writing some code for evaluating e^x but it's giving me an error I can't understand , can I share it with you guys?
2021-04-13 13:06:20	<hyperisco>	yes
2021-04-13 13:06:27	<merijn>	I'm pretty sure I know the issue without seeing it ;)
2021-04-13 13:06:42	<merijn>	Probably the difference between
2021-04-13 13:06:45	<merijn>	:t (**)
2021-04-13 13:06:47	<lambdabot>	Floating a => a -> a -> a
2021-04-13 13:06:48	<merijn>	:t (^)
2021-04-13 13:06:49	<lambdabot>	(Integral b, Num a) => a -> b -> a
2021-04-13 13:06:50	<merijn>	:t (^^)
2021-04-13 13:06:52	<lambdabot>	(Fractional a, Integral b) => a -> b -> a
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2021-04-13 13:07:42	<Komrad_Kafuka>	{-# LANGUAGE FlexibleInstances, UndecidableInstances, DuplicateRecordFields #-}
2021-04-13 13:07:43	<Komrad_Kafuka>	module Main where
2021-04-13 13:07:43	<Komrad_Kafuka>	import Control.Monad
2021-04-13 13:07:44	<Komrad_Kafuka>	import Data.Array
2021-04-13 13:07:44	<Komrad_Kafuka>	import Data.Bits
2021-04-13 13:07:44	<Komrad_Kafuka>	import Data.List
2021-04-13 13:07:45	<Komrad_Kafuka>	import Data.List.Split
2021-04-13 13:07:45	<Komrad_Kafuka>	import Data.Set
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2021-04-13 13:07:46	<Komrad_Kafuka>	import Debug.Trace
2021-04-13 13:07:47	<Komrad_Kafuka>	import System.Environment
2021-04-13 13:07:47	<Komrad_Kafuka>	import System.IO
2021-04-13 13:07:47	<Komrad_Kafuka>	import System.IO.Unsafe
2021-04-13 13:07:48	<Komrad_Kafuka>	factorial :: Double -> Double
2021-04-13 13:07:48	<Komrad_Kafuka>	factorial 0 = 1
2021-04-13 13:07:49	<Komrad_Kafuka>	factorial x = x * factorial x - 1
2021-04-13 13:07:49	<Komrad_Kafuka>	pow :: Double -> Integer -> Double
2021-04-13 13:07:50	<Komrad_Kafuka>	pow _ 0 = 1.000 :: Double
2021-04-13 13:07:50	<Komrad_Kafuka>	pow 0 _ = 0.000 :: Double
2021-04-13 13:08:04	<Komrad_Kafuka>	Here's the error
2021-04-13 13:08:05	<Komrad_Kafuka>	Solution.hs:27:41: error:
2021-04-13 13:08:06	<Komrad_Kafuka>	• Couldn't match expected type ‘Double’ with actual type ‘Integer’
2021-04-13 13:08:06	<Komrad_Kafuka>	• In the first argument of ‘factorial’, namely ‘count’
2021-04-13 13:08:07	<Komrad_Kafuka>	In the second argument of ‘(/)’, namely ‘(factorial count)’
2021-04-13 13:08:07	<Komrad_Kafuka>	In the first argument of ‘(+)’, namely
2021-04-13 13:08:08	<Komrad_Kafuka>	‘(pow x count) / (factorial count)’
2021-04-13 13:08:08	<Komrad_Kafuka>	\|
2021-04-13 13:08:09	<Komrad_Kafuka>	27 \| eval x count = (pow x count)/(factorial count) + (eval x count - 1)
2021-04-13 13:08:09	<Komrad_Kafuka>	\| ^^^^^
2021-04-13 13:08:10	<Komrad_Kafuka>	Solution.hs:36:9: error:
2021-04-13 13:08:10	<Komrad_Kafuka>	• Couldn't match expected type ‘Double -> Integer -> IO b0’
2021-04-13 13:08:11	<Komrad_Kafuka>	with actual type ‘IO ()’
2021-04-13 13:08:11	<Komrad_Kafuka>	• The function ‘print’ is applied to three arguments,
2021-04-13 13:08:12	<Komrad_Kafuka>	but its type ‘(Double -> Integer -> Double) -> IO ()’ has only one
2021-04-13 13:08:12	<Komrad_Kafuka>	In a stmt of a 'do' block: print eval x 0
2021-04-13 13:08:13	<Komrad_Kafuka>	In the expression:
2021-04-13 13:08:13	<Komrad_Kafuka>	do x <- readLn :: IO Double
2021-04-13 13:08:14	<Komrad_Kafuka>	print eval x 0
2021-04-13 13:08:14	<Komrad_Kafuka>	\|
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2021-04-13 13:09:09	<ski>	@where paste
2021-04-13 13:09:10	<lambdabot>	Help us help you: please paste full code, input and/or output at e.g. https://paste.tomsmeding.com
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2021-04-13 13:09:39	<ski>	Komrad_Kafuka : please use a paste site (like e.g. that ^ above), next time -- don't paste huge amounts of lines into the channel
2021-04-13 13:10:06	<Komrad_Kafuka>	Sure, sorry about that
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2021-04-13 13:10:21	<ski>	(i was actually surprised you weren't automatically K-lined by Sigyn for doing that .. but now i notices Sigyn's gone missing, for whatever reason)
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2021-04-13 13:10:52	<Komrad_Kafuka>	https://paste.tomsmeding.com/VGuP7TtX
2021-04-13 13:11:38	<Komrad_Kafuka>	ski yeah I did not get any message at first, here's the link

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