Re: [Haskell-cafe] What is the good way to work with list comprehension and UTCTime?
Thank you. Will do. On Mon, Sep 17, 2012 at 7:14 AM, Antoine Latter wrote: > On Sun, Sep 16, 2012 at 5:04 PM, Richard O'Keefe wrote: >> >> On 15/09/2012, at 5:14 AM, Chris Heller wrote: >> >>> You might want to have a look at the time-recurrence package: >>> http://hackage.haskell.org/package/time-recurrence >>> >>> For your simple cases you would do something like: >>> >>> Each second: >>> >>> starting (UTCTime ...) $ recur secondly >>> >>> Each minute: >>> >>> starting (UTCTime ...) $ recur minutely >> >> Ouch. Look up "minutely" (my-NEWT-ly) in an English >> dictionary. Look up "secondly" while you're there. >> >> > > You can blame RFC 5545 for that one. In section 3.3.10. our frequencies are: > > freq= "SECONDLY" / "MINUTELY" / "HOURLY" / "DAILY" >/ "WEEKLY" / "MONTHLY" / "YEARLY" > > Antoine > > ___ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe -- 竹密岂妨流水过 山高哪阻野云飞 And for G+, please use magiclouds#gmail.com. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] What is the good way to work with list comprehension and UTCTime?
Antoine has it right, the language is lifted from the RFC. Chris Heller SAS - Advanced Analytics Teragram Research & Development phone: 1-617-576-6800 x54237 mobile: 1-617-460-3643 email: hel...@teragram.com On Sep 16, 2012, at 7:14 PM, Antoine Latter wrote: > On Sun, Sep 16, 2012 at 5:04 PM, Richard O'Keefe wrote: >> >> On 15/09/2012, at 5:14 AM, Chris Heller wrote: >> >>> You might want to have a look at the time-recurrence package: >>> http://hackage.haskell.org/package/time-recurrence >>> >>> For your simple cases you would do something like: >>> >>> Each second: >>> >>>starting (UTCTime ...) $ recur secondly >>> >>> Each minute: >>> >>>starting (UTCTime ...) $ recur minutely >> >> Ouch. Look up "minutely" (my-NEWT-ly) in an English >> dictionary. Look up "secondly" while you're there. >> >> > > You can blame RFC 5545 for that one. In section 3.3.10. our frequencies are: > > freq= "SECONDLY" / "MINUTELY" / "HOURLY" / "DAILY" > / "WEEKLY" / "MONTHLY" / "YEARLY" > > Antoine ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] What is the good way to work with list comprehension and UTCTime?
On Sun, Sep 16, 2012 at 5:04 PM, Richard O'Keefe wrote: > > On 15/09/2012, at 5:14 AM, Chris Heller wrote: > >> You might want to have a look at the time-recurrence package: >> http://hackage.haskell.org/package/time-recurrence >> >> For your simple cases you would do something like: >> >> Each second: >> >> starting (UTCTime ...) $ recur secondly >> >> Each minute: >> >> starting (UTCTime ...) $ recur minutely > > Ouch. Look up "minutely" (my-NEWT-ly) in an English > dictionary. Look up "secondly" while you're there. > > You can blame RFC 5545 for that one. In section 3.3.10. our frequencies are: freq= "SECONDLY" / "MINUTELY" / "HOURLY" / "DAILY" / "WEEKLY" / "MONTHLY" / "YEARLY" Antoine ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] What is the good way to work with list comprehension and UTCTime?
On 15/09/2012, at 5:14 AM, Chris Heller wrote: > You might want to have a look at the time-recurrence package: > http://hackage.haskell.org/package/time-recurrence > > For your simple cases you would do something like: > > Each second: > > starting (UTCTime ...) $ recur secondly > > Each minute: > > starting (UTCTime ...) $ recur minutely Ouch. Look up "minutely" (my-NEWT-ly) in an English dictionary. Look up "secondly" while you're there. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] What is the good way to work with list comprehension and UTCTime?
This is nice. Thanks to all. On Fri, Sep 14, 2012 at 4:03 PM, Roman Cheplyaka wrote: > Consider using the time-lens package. > > import Data.Time.Lens > import Data.Lens.Common > > List comprehension style: > > [modL seconds (+ fromIntegral n) t | n <- [0..]] > [modL minutes (+ n) t | n <- [0..]] > > (you need fromIntegral for seconds, because it is of fractional type in > Data.Time). > > iterate style, as suggested by Karl: > > iterate (seconds ^+= 1) t > iterate (minutes ^+= 1) t > > On Fri, Sep 14, 2012 at 7:29 AM, Magicloud Magiclouds > wrote: >> >> Hi, >> Simple usage, I could make an instance of Enum to UTCTime, so >> [utcTime..] could work. But that is so stiff. How if sometimes I want >> to step by 1 min, sometimes I want to step by 1 sec? >> So I think some way like [ t | addUTCTime last 60 ] could be nice. >> But I cannot figure it out >> Any idea? >> -- >> 竹密岂妨流水过 >> 山高哪阻野云飞 >> >> And for G+, please use magiclouds#gmail.com. >> >> ___ >> Haskell-Cafe mailing list >> Haskell-Cafe@haskell.org >> http://www.haskell.org/mailman/listinfo/haskell-cafe > > -- 竹密岂妨流水过 山高哪阻野云飞 And for G+, please use magiclouds#gmail.com. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] What is the good way to work with list comprehension and UTCTime?
Consider using the time-lens package. import Data.Time.Lens import Data.Lens.Common List comprehension style: [modL seconds (+ fromIntegral n) t | n <- [0..]] [modL minutes (+ n) t | n <- [0..]] (you need fromIntegral for seconds, because it is of fractional type in Data.Time). iterate style, as suggested by Karl: iterate (seconds ^+= 1) t iterate (minutes ^+= 1) t On Fri, Sep 14, 2012 at 7:29 AM, Magicloud Magiclouds < magicloud.magiclo...@gmail.com> wrote: > Hi, > Simple usage, I could make an instance of Enum to UTCTime, so > [utcTime..] could work. But that is so stiff. How if sometimes I want > to step by 1 min, sometimes I want to step by 1 sec? > So I think some way like [ t | addUTCTime last 60 ] could be nice. > But I cannot figure it out > Any idea? > -- > 竹密岂妨流水过 > 山高哪阻野云飞 > > And for G+, please use magiclouds#gmail.com. > > ___ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] What is the good way to work with list comprehension and UTCTime?
On Thu, Sep 13, 2012 at 10:29 PM, Magicloud Magiclouds < magicloud.magiclo...@gmail.com> wrote: > Hi, > Simple usage, I could make an instance of Enum to UTCTime, so > [utcTime..] could work. But that is so stiff. How if sometimes I want > to step by 1 min, sometimes I want to step by 1 sec? > So I think some way like [ t | addUTCTime last 60 ] could be nice. > But I cannot figure it out > Any idea? > Try using Prelude.iterate. -Karl ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] What is the good way to work with list comprehension and UTCTime?
Hi, Simple usage, I could make an instance of Enum to UTCTime, so [utcTime..] could work. But that is so stiff. How if sometimes I want to step by 1 min, sometimes I want to step by 1 sec? So I think some way like [ t | addUTCTime last 60 ] could be nice. But I cannot figure it out Any idea? -- 竹密岂妨流水过 山高哪阻野云飞 And for G+, please use magiclouds#gmail.com. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
