I guess whatever version you are using did not export that function. In any case the definition for that function is incredibly simple, so you could just write your own for now. diffTimeSpec :: TimeSpec -> TimeSpec -> TimeSpecdiffTimeSpec ts1 ts2 = abs (ts1 - ts2) On Mon, Jul 9, 2018 at 9:08 AM, Awsaf Rahman wrote:

I imported the System.Clock module and tried to use the diffTimeSpec function but it keeps saying "out of scope".

On Mon, Jul 9, 2018 at 2:45 PM, David McBride wrote:

...

There is a diffTimeSpec function in that module that seems like it would work.

On Mon, Jul 9, 2018 at 8:30 AM, Awsaf Rahman wrote:

...

Hello,

I am trying to time a function I have written in haskell using the clock package in the following way:

*start <- getTime Monotonic* *evaluate(something)* *end <- getTime Monotonic* *fprint (timeSpecs % "\n") start end*

Now what I want is to store the time difference between *start* and *end. *Is there a way I can do that?

Regards Awsaf

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toList :: String -> [Integer] toList input = read ("[" ++ input ++ "]") That was creative, but a more idiomatic way to write that would be to use the split package stack ghci --package split import Data.Split toList :: String -> [Integer] toList = fmap read . splitOn "," As for how to aggregate times, start thinking about the types before you start. Each iteration you should take a List and return a TimeSpec. testcase :: [Integer] -> IO TimeSpec testcase l = do start <- getTime Monotonic evaluate (mergesort l) end <- getTime Monotonic return $ diffTimeSpec start end Now, we need to run it 100 times and collect the times. Sounds like a job for map, but since testcase is monadic, use mapM instead (or traverse). main = do unsortedList <- undefined times <- mapM (\c -> testcase unsortedList) [1..100] print times On Mon, Jul 9, 2018 at 9:40 AM, Awsaf Rahman wrote:

Okay, here is what I am trying to do. I am trying to time this mergesort program. I want to run this program 100, 1000, etc times and store the timing results in a list if possible. Can't seem to figure out how to do it! The following program prints the timings to the shell and I need to figure out a way to store the timings in a list.

{-# LANGUAGE OverloadedStrings #-} {-# LANGUAGE BangPatterns #-} import Control.Exception import Formatting import Formatting.Clock import System.Clock import Control.DeepSeq

mergesort [] = [] mergesort [x] = [x] mergesort xs = let (lhalf, rhalf) = splitAt (length xs `div` 2) xs in merge' (mergesort lhalf) (mergesort rhalf)

merge' lhalf rhalf = merge lhalf rhalf []

merge [] [] acc = reverse acc merge [] y acc = reverse acc ++ y merge x [] acc = reverse acc ++ x

merge (l:ls) (r:rs) acc | l < r = merge ls (r:rs) (l:acc) | otherwise = merge rs (l:ls) (r:acc)

toList :: String -> [Integer] toList input = read ("[" ++ input ++ "]")

repeater unsortedlist 0 result = return (result)

repeater unsortedlist counter result = do start <- getTime Monotonic evaluate(mergesort unsortedlist) end <- getTime Monotonic fprint (timeSpecs % "\n") start end repeater unsortedlist (counter-1) result

main = do file <- getLine contents <- readFile file let !unsortedlist = (toList contents) repeater unsortedlist 100 []

On Mon, Jul 9, 2018 at 3:21 PM, David McBride wrote:

...

I guess whatever version you are using did not export that function. In any case the definition for that function is incredibly simple, so you could just write your own for now.

diffTimeSpec :: TimeSpec -> TimeSpec -> TimeSpecdiffTimeSpec ts1 ts2 = abs (ts1 - ts2)

On Mon, Jul 9, 2018 at 9:08 AM, Awsaf Rahman wrote:

...

I imported the System.Clock module and tried to use the diffTimeSpec function but it keeps saying "out of scope".

On Mon, Jul 9, 2018 at 2:45 PM, David McBride wrote:

...

There is a diffTimeSpec function in that module that seems like it would work.

On Mon, Jul 9, 2018 at 8:30 AM, Awsaf Rahman

...

wrote:

...

Hello,

I am trying to time a function I have written in haskell using the clock package in the following way:

*start <- getTime Monotonic* *evaluate(something)* *end <- getTime Monotonic* *fprint (timeSpecs % "\n") start end*

Now what I want is to store the time difference between *start* and *end. *Is there a way I can do that?

Regards Awsaf

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