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Groups > comp.os.linux.advocacy > #383657
| From | deplorable owl <owl@rooftop.invalid> |
|---|---|
| Newsgroups | comp.os.linux.advocacy |
| Subject | Re: Where are you, sdb? I have something fun for your little morons to try |
| Date | 2016-12-11 09:05 +0000 |
| Organization | O.W.L. |
| Message-ID | <ahgjbuc0q.bra@rooftop.invalid> (permalink) |
| References | (10 earlier) <20161211075236.12628ebe@maxa-pc> <ahjblc00g.a3i@rooftop.invalid> <o2iuua$vke$1@news.albasani.net> <ahbocz003.abu4@rooftop.invalid> <o2ivsq$ub4$1@news.albasani.net> |
Melzzzzz <Melzzzzz@zzzzz.com> wrote: > On 11/12/16 08:37 AM, deplorable owl wrote: >> Melzzzzz <Melzzzzz@zzzzz.com> wrote: >>> On 11/12/16 08:09 AM, deplorable owl wrote: >>>> Melzzzzz <mel@zzzzz.com> wrote: >>>>> On Sun, 11 Dec 2016 06:49:30 +0000 (UTC) >>>>> deplorable owl <owl@rooftop.invalid> wrote: >>>>> >>>>>> Melzzzzz <Melzzzzz@zzzzz.com> wrote: >>>>>>> On 11/12/16 06:55 AM, deplorable owl wrote: >>>>>>>> Melzzzzz <Melzzzzz@zzzzz.com> wrote: >>>>>>>>> On 11/12/16 05:27 AM, deplorable owl wrote: >>>>>>>>>> Melzzzzz <Melzzzzz@zzzzz.com> wrote: >>>>>>>>>>> On 11/12/16 05:00 AM, deplorable owl wrote: >>>>>>>>>>>> Melzzzzz <mel@zzzzz.com> wrote: >>>>>>>>>>>>> On Sat, 10 Dec 2016 19:56:49 +0000 (UTC) >>>>>>>>>>>>> deplorable owl <owl@rooftop.invalid> wrote: >>>>>>>>>>>>> >>>>>>>>>>>>>> Melzzzzz <Melzzzzz@zzzzz.com> wrote: >>>>>>>>>>>>>>> On 10/12/16 07:25 AM, deplorable owl wrote: >>>>>>>>>>>>>>>> Melzzzzz <Melzzzzz@zzzzz.com> wrote: >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> BTW, what's the proper approach to randomizing such a huge >>>>>>>>>>>>>>>> number of values? (A large enough pool of seconds so that >>>>>>>>>>>>>>>> randoms would have a good chance of falling on 100,000 >>>>>>>>>>>>>>>> different days). >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>> You don't have to just filter out dupes ;p >>>>>>>>>>>>>>> It is not needed to have 100000k uniques at all. >>>>>>>>>>>>>> >>>>>>>>>>>>>> Yeah, but filtering is just to get uniques. Say you want >>>>>>>>>>>>>> 100000 unique days using random second values, minimizing >>>>>>>>>>>>>> dups and generating exactly 100000 values, how would you >>>>>>>>>>>>>> approach that? >>>>>>>>>>>>> >>>>>>>>>>>>> I would generate 100000 days in order, then shuffle. >>>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> Yes, that's easy, but it dodges the pre-generation randomizing >>>>>>>>>>>> problem rather than addressing it, and also requires generation >>>>>>>>>>>> of a full 8.64 billion numbers then modulo 86400 to get 100000 >>>>>>>>>>>> unique sequential days before shuffling. >>>>>>>>>>> >>>>>>>>>>> Hm, I don't get it ;) >>>>>>>>>>> Just create 100k dates and then shuffle, what's the problem? >>>>>>>>>>> >>>>>>>>>> >>>>>>>>>> It's not really about dates. It's about the rand problem that >>>>>>>>>> arises if you randomize 100,000 time_t values with the goal of >>>>>>>>>> 100,000 unique DD-MM-YYYY values. Consider it generically. >>>>>>>>>> Forget that it's a date function, and assume that you have a >>>>>>>>>> pool of input values for which output values only change for >>>>>>>>>> every 86400 inputs. You want to get 100,000 random (but >>>>>>>>>> hopefully unique) outputs given only 100,000 randomly chosen >>>>>>>>>> inputs. How do you randomize your inputs where the input pool is >>>>>>>>>> minimum 8.64 billion to guarantee that you *might* get 100,000 >>>>>>>>>> unique outputs. >>>>>>>>>> >>>>>>>>>> >>>>>>>>> You first get starting date and ending date. Then generate all >>>>>>>>> possible dates in range. Then randomly pick required number of >>>>>>>>> dates from that list.. >>>>>>>> >>>>>>>> Again, forget that it's dates. Say you have a step function f(x) >>>>>>>> that only changes values for every 86400 values of x (x +/- >>>>>>>> integers). You don't get to select random f(x). You must select >>>>>>>> 100000 random x and get 100000 hopefully unique f(x). What does >>>>>>>> your rand routine look like? >>>>>>> Same answer. >>>>>>> >>>>>> >>>>>> Did you note this part: "You don't get to select random f(x)" ? >>>>>> You must pick 100000 random x, not 100000 random f(x). >>>>>> >>>>> >>>>> It all boils down to same. If you dont have pool of unique numbers to >>>>> pick, you can't produce unique numbers... random functions are random... >>>>> >>>> >>>> True, but you can A) choose a big enough pool, or B) choose an efficient >>>> randomizing algorithm. >>> >>> Efficient randomizing algorithm? Every randomizing algorithm takes >>> number from pool of numbers. If you pick from same pool every time there >>> is always chance to pick same number. you don't get it ? >>> >> >> Yes, of course, but what I am asking is, is there not a way to improve >> this without resorting to increasing the pool size to a crazy range? > > Only way is to make function non random. Pick any linear monotonic > function and voila ;) > That sucks. Oh well, if nothing else, at least by playing with this I learned that there actually was a year zero. :) anon@lowtide:~/code/dfsdates$ ./getdaysec -62167201441 -t 31-Dec--1 23:59:57 (year is BC) anon@lowtide:~/code/dfsdates$ ./getdaysec -62167201440 -t 31-Dec--1 23:59:58 (year is BC) anon@lowtide:~/code/dfsdates$ ./getdaysec -62167201439 -t 31-Dec--1 23:59:59 (year is BC) anon@lowtide:~/code/dfsdates$ ./getdaysec -62167201438 -t 01-Jan-0 00:00:00 (we are in YEAR ZERO!) anon@lowtide:~/code/dfsdates$ ./getdaysec -62167201437 -t 01-Jan-0 00:00:01 (we are in YEAR ZERO!) anon@lowtide:~/code/dfsdates$ ./getdaysec -62167201436 -t 01-Jan-0 00:00:02 (we are in YEAR ZERO!) anon@lowtide:~/code/dfsdates$ ./getdaysec -62157201438 -t 25-Apr-0 17:46:40 (we are in YEAR ZERO!) anon@lowtide:~/code/dfsdates$ ./getdaysec -62147201438 -t 19-Aug-0 11:33:20 (we are in YEAR ZERO!) anon@lowtide:~/code/dfsdates$ ./getdaysec -62137201438 -t 13-Dec-0 05:20:00 (we are in YEAR ZERO!) anon@lowtide:~/code/dfsdates$ ./getdaysec -62135579041 -t 31-Dec-0 23:59:57 (we are in YEAR ZERO!) anon@lowtide:~/code/dfsdates$ ./getdaysec -62135579040 -t 31-Dec-0 23:59:58 (we are in YEAR ZERO!) anon@lowtide:~/code/dfsdates$ ./getdaysec -62135579039 -t 31-Dec-0 23:59:59 (we are in YEAR ZERO!) anon@lowtide:~/code/dfsdates$ ./getdaysec -62135579038 -t 01-Jan-1 00:00:00 anon@lowtide:~/code/dfsdates$ ./getdaysec -62135579037 -t 01-Jan-1 00:00:01 anon@lowtide:~/code/dfsdates$ ./getdaysec -62135579036 -t 01-Jan-1 00:00:02 anon@lowtide:~/code/dfsdates$
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Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-07 12:27 -0500
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-07 19:52 +0000
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-07 21:28 -0500
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-08 05:52 +0000
Re: Where are you, sdb? I have something fun for your little morons to try chrisv <chrisv@nospam.invalid> - 2016-12-08 07:02 -0600
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-08 09:02 -0500
Re: Where are you, sdb? I have something fun for your little morons to try Adlbifhr Mjduhgfks <am@random.us> - 2016-12-08 00:32 +0000
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-07 21:48 -0500
Re: Where are you, sdb? I have something fun for your little morons to try Adlbifhr Mjduhgfks <am@random.us> - 2016-12-08 14:17 +0000
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-08 11:00 -0500
Re: Where are you, sdb? I have something fun for your little morons to try Steve Carroll <fretwizzer@gmail.com> - 2016-12-08 09:13 -0800
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-08 18:41 -0500
Re: Where are you, sdb? I have something fun for your little morons to try Steve Carroll <fretwizzer@gmail.com> - 2016-12-08 17:32 -0800
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-08 21:12 -0500
Cartoons are easier to read than the Wall Street Journal. Jeff-Relf.Me <@.> - 2016-12-08 20:16 -0800
Re: Where are you, sdb? I have something fun for your little morons to try Steve Carroll <fretwizzer@gmail.com> - 2016-12-09 09:03 -0800
Re: Where are you, sdb? I have something fun for your little morons to try Adlbifhr Mjduhgfks <am@random.us> - 2016-12-08 15:49 +0000
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-08 11:00 -0500
Re: Where are you, sdb? I have something fun for your little morons to try Adlbifhr Mjduhgfks <am@random.us> - 2016-12-08 16:24 +0000
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-08 18:43 -0500
Only _results_ matter; i.e.: What does it do ? Jeff-Relf.Me <@.> - 2016-12-08 19:45 -0800
Re: Only _results_ matter; i.e.: What does it do ? flatfish+++ <flatfish@linuxmail.org> - 2016-12-08 22:50 -0500
I don't need the source code. Jeff-Relf.Me <@.> - 2016-12-08 20:39 -0800
Re: I don't need the source code. flatfish+++ <flatfish@linuxmail.org> - 2016-12-08 23:48 -0500
I'm hard to copy, thank God. Jeff-Relf.Me <@.> - 2016-12-08 22:30 -0800
Re: I'm hard to copy, thank God. flatfish+++ <flatfish@linuxmail.org> - 2016-12-09 01:54 -0500
Re: I'm hard to copy, thank God. Steve Carroll <fretwizzer@gmail.com> - 2016-12-09 12:30 -0800
Re: I don't need the source code. Poutnik <poutnik4nntp@gmail.com> - 2016-12-09 07:12 +0100
Re: I don't need the source code. flatfish+++ <flatfish@linuxmail.org> - 2016-12-09 01:15 -0500
Re: I don't need the source code. Poutnik <poutnik4nntp@gmail.com> - 2016-12-09 07:27 +0100
Re: I don't need the source code. flatfish+++ <flatfish@linuxmail.org> - 2016-12-09 01:44 -0500
Usenet is not CraigsList nor WikiPedia, Reddit. Jeff-Relf.Me <@.> - 2016-12-08 23:00 -0800
Re: Usenet is not CraigsList nor WikiPedia, Reddit. flatfish+++ <flatfish@linuxmail.org> - 2016-12-09 02:12 -0500
If/When Cola is being honest, they don't think MicroSoft is "Evil". Jeff-Relf.Me <@.> - 2016-12-08 23:56 -0800
Re: Usenet is not CraigsList nor WikiPedia, Reddit. Poutnik <poutnik4nntp@gmail.com> - 2016-12-09 08:16 +0100
Usually, the __DEFAULT__ "Subject:" line isn't best. Jeff-Relf.Me <@.> - 2016-12-08 22:53 -0800
Re: Usually, the __DEFAULT__ "Subject:" line isn't best. Poutnik <poutnik4nntp@gmail.com> - 2016-12-09 08:19 +0100
Please lookup the word "Default". Jeff-Relf.Me <@.> - 2016-12-08 23:31 -0800
Re: Please lookup the word "Default". Poutnik <poutnik4nntp@gmail.com> - 2016-12-09 08:42 +0100
The parent post. -- Re: Please lookup the word "Default". Jeff-Relf.Me <@.> - 2016-12-09 00:12 -0800
Re: The parent post. -- Re: Please lookup the word "Default". Poutnik <poutnik4nntp@gmail.com> - 2016-12-09 11:28 +0100
Threads branch like a tree, SubTopics sprout. Jeff-Relf.Me <@.> - 2016-12-09 03:35 -0800
Re: Threads branch like a tree, SubTopics sprout. Poutnik <poutnik4nntp@gmail.com> - 2016-12-09 16:18 +0100
Re: The parent post. -- Re: Please lookup the word "Default". moroney@world.std.spaamtrap.com (Michael Moroney) - 2016-12-09 15:05 +0000
I want details, Michael Moroney. Jeff-Relf.Me <@.> - 2016-12-09 07:18 -0800
Re: I want details, Michael Moroney. Steve Carroll <fretwizzer@gmail.com> - 2016-12-09 10:38 -0800
Re: I want details, Michael Moroney. moroney@world.std.spaamtrap.com (Michael Moroney) - 2016-12-10 04:03 +0000
I never had to deal with such problems. Jeff-Relf.Me <@.> - 2016-12-09 21:15 -0800
Re: I never had to deal with such problems. moroney@world.std.spaamtrap.com (Michael Moroney) - 2016-12-11 01:50 +0000
Re: The parent post. -- Re: Please lookup the word "Default". chrisv <chrisv@nospam.invalid> - 2016-12-09 09:37 -0600
Re: The parent post. -- Re: Please lookup the word "Default". moroney@world.std.spaamtrap.com (Michael Moroney) - 2016-12-09 20:32 +0000
Re: I don't need the source code. chrisv <chrisv@nospam.invalid> - 2016-12-09 06:39 -0600
Re: I don't need the source code. Poutnik <poutnik4nntp@gmail.com> - 2016-12-09 16:19 +0100
Re: I don't need the source code. Silver Slimer <.m@nsn.s> - 2016-12-09 11:51 -0500
Re: I don't need the source code. flatfish+++ <flatfish@linuxmail.org> - 2016-12-09 12:07 -0500
Re: I don't need the source code. Silver Slimer <.m@nsn.s> - 2016-12-09 12:22 -0500
Re: I don't need the source code. flatfish+++ <flatfish@linuxmail.org> - 2016-12-09 12:28 -0500
Re: I don't need the source code. moroney@world.std.spaamtrap.com (Michael Moroney) - 2016-12-09 17:52 +0000
I only have time to read a few select authors, sorry. Jeff-Relf.Me <@.> - 2016-12-09 10:05 -0800
Re: I don't need the source code. chrisv <chrisv@nospam.invalid> - 2016-12-09 12:26 -0600
Re: I don't need the source code. Silver Slimer <.m@nsn.s> - 2016-12-09 14:06 -0500
Re: I don't need the source code. Chris Ahlstrom <OFeem1987@teleworm.us> - 2016-12-09 19:56 -0500
Re: I don't need the source code. Silver Slimer <.m@nsn.s> - 2016-12-10 09:23 -0500
Re: Only _results_ matter; i.e.: What does it do ? fr314159@gmail.com - 2016-12-09 07:17 -0800
Re: Only _results_ matter; i.e.: What does it do ? DFS <nospam@dfs.com> - 2016-12-12 18:54 -0500
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-12 18:39 -0500
Re: Where are you, sdb? I have something fun for your little morons to try Melzzzzz <mel@zzzzz.com> - 2016-12-09 03:38 +0100
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-09 19:00 +0000
Re: Where are you, sdb? I have something fun for your little morons to try Melzzzzz <mel@zzzzz.com> - 2016-12-10 00:33 +0100
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-10 05:24 +0000
Re: Where are you, sdb? I have something fun for your little morons to try Melzzzzz <Melzzzzz@zzzzz.com> - 2016-12-10 06:54 +0100
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-10 06:25 +0000
Re: Where are you, sdb? I have something fun for your little morons to try Melzzzzz <Melzzzzz@zzzzz.com> - 2016-12-10 07:28 +0100
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-10 19:56 +0000
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-10 15:19 -0500
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-10 15:23 -0500
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-10 20:44 +0000
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-10 17:55 -0500
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-11 00:02 +0000
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-10 19:39 -0500
C/CPP's "srand( int Seed )" generates an array of (PseudoRandom) int's. Jeff-Relf.Me <@.> - 2016-12-10 23:09 -0800
Re: C/CPP's "srand( int Seed )" generates an array of (PseudoRandom) int's. deplorable owl <owl@rooftop.invalid> - 2016-12-11 07:23 +0000
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-10 19:56 -0500
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-10 20:07 -0500
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-11 04:07 +0000
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-11 00:18 -0500
Re: Where are you, sdb? I have something fun for your little morons to try Melzzzzz <mel@zzzzz.com> - 2016-12-11 03:40 +0100
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-11 04:00 +0000
Re: Where are you, sdb? I have something fun for your little morons to try Melzzzzz <Melzzzzz@zzzzz.com> - 2016-12-11 05:08 +0100
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-11 04:27 +0000
Re: Where are you, sdb? I have something fun for your little morons to try Melzzzzz <Melzzzzz@zzzzz.com> - 2016-12-11 05:58 +0100
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-11 05:55 +0000
Re: Where are you, sdb? I have something fun for your little morons to try Melzzzzz <Melzzzzz@zzzzz.com> - 2016-12-11 07:11 +0100
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-11 06:49 +0000
Re: Where are you, sdb? I have something fun for your little morons to try Melzzzzz <mel@zzzzz.com> - 2016-12-11 07:52 +0100
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-11 07:09 +0000
Re: Where are you, sdb? I have something fun for your little morons to try Melzzzzz <Melzzzzz@zzzzz.com> - 2016-12-11 08:23 +0100
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-11 07:37 +0000
Re: Where are you, sdb? I have something fun for your little morons to try Melzzzzz <Melzzzzz@zzzzz.com> - 2016-12-11 08:40 +0100
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-11 09:05 +0000
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-10 19:41 +0000
Re: Where are you, sdb? I have something fun for your little morons to try Melzzzzz <mel@zzzzz.com> - 2016-12-10 20:48 +0100
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-10 20:06 +0000
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-10 10:32 -0500
Re: Where are you, sdb? I have something fun for your little morons to try Melzzzzz <mel@zzzzz.com> - 2016-12-10 16:40 +0100
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-10 11:03 -0500
Re: Where are you, sdb? I have something fun for your little morons to try Steve Carroll <fretwizzer@gmail.com> - 2016-12-10 09:26 -0800
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-10 12:38 -0500
Re: Where are you, sdb? I have something fun for your little morons to try Steve Carroll <fretwizzer@gmail.com> - 2016-12-10 09:52 -0800
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-10 13:01 -0500
Re: Where are you, sdb? I have something fun for your little morons to try Steve Carroll <fretwizzer@gmail.com> - 2016-12-10 10:06 -0800
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-10 19:38 +0000
Re: Where are you, sdb? I have something fun for your little morons to try DFS <nospam@dfs.com> - 2016-12-10 19:55 -0500
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-10 19:33 +0000
Re: Where are you, sdb? I have something fun for your little morons to try deplorable owl <owl@rooftop.invalid> - 2016-12-10 20:00 +0000
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