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Does something like a "statistically intractable" set of problems exist? That is, problems that can be solved in polynomial time with a non-statistically approach, but cannot be tackled with stats?-- Terurme ( talk) 12:36, 10 February 2017 (UTC)
It is deceptively difficult with calculus.In your example, the period would actually be 2d if d were the diameter of a circle which followed the curve of each peak or valley, because it takes a peak and valley pair to make 1 period. But you said a period of d, so I'll go with that. So, assuming the semicircular shape you seemed to be assuming (and which is common for corrugated steel) for the sine wave produced in this way, the answer is actually fairly trivial to calculate using basic algebra:
S = 1/2dΠ(l/d)
where S is the length of steel required. That being said, sine waves don't generally form perfect semicircles out of their peaks and valleys so one is forced to do a lot more work to model a realistic sine wave. And yes, this is (to the best of my knowledge) very difficult to do in calculus, but very easy to do with a loop.
ᛗᛁᛟᛚᚾᛁᚱPants
Tell me all about it. 15:07, 10 February 2017 (UTC)
The trick is getting that specific arc length on the last semicircle.If you're saying that l/d must be an integer, then yes; it's very tricky and requires calculus. If you're saying the last semicircle is going to have a diameter of l%d (note this is programming notation, % is the modulus operator), then it's a little tricky but not too bad (still better to do with a loop, but fairly easy with algebra).
And I did purposely make the problem much easier. In the original, the width of each semicircle was d and the height was h - so they weren't actually semicircles. They were ellipses. I found that complication to be silly.I figured it was on purpose, to make it easier to explain. It's pretty rare for the frequency and amplitude of a wave to be exactly the same. The answer I provided only works when that is the case, naturally. I think I could work out how to do it algebraically, but despite being a programmer, I've never been very good at math and I don't want to make my brain hurt. And I'd probably get it wrong, anyways (note how I had to correct my formula above from d/l to l/d). ᛗᛁᛟᛚᚾᛁᚱPants Tell me all about it. 15:43, 10 February 2017 (UTC)
I have Windows 10 and Microsoft Edge and recently went through a major software upgrade with a message saying to restart my computer and wait approximately 90 minutes for the updates to take effect. All I know about the change is that my slow Internet has gotten faster, though I made no changes that should have made that happen. I turn off the computer these days with the button that tells it to sleep, so it comes on in the middle of the night. Apparently an update of some kind has taken place.
Yesterday it seemed like every web site I went to gave me "yahoo.com is not responding" with a button to "recover webpage". If I clicked on the button I got a message with a green line moving back and forth saying Windows was searching for a solution. If they found one, they didn't tell me. Most of the time the problem cleared up quickly and I never had to click on the "recover webpage" button or anything else.
Most sites work--eventually. Some are faster than others. Some never give me the message. McClatchy Newspapers sites sometimes won't let me go to articles, but I found a workaround by right-clicking and copying the link and then pasting. With these sites, the page will disappear and then come back. tunegenie.com will update the playlist but I can't listen to the radio station; it never stops "buffering" and the blue circle just keeps on turning.
I do have some hints. I signed in to radioinsight.com a few minutes ago and got some javascript error. It didn't stop me from signing in but I was never able to "agree to terms", which was something I had to do today for some reason. I also could not ask a new question here by clicking on the ask a question button.— Vchimpanzee • talk • contributions • 18:15, 10 February 2017 (UTC)
[your] slow Internet has gotten faster, though [you] made no changesis that the browser (Edge) was updated and in the process the browser cache was cleared; in which case, the connection has not really gotten faster, but the browser has. This definitely happened to me with a previous version of Firefox, although there is no real reason that cache-clearing improves your situation, even with a large cache size. Tigraan Click here to contact me 19:01, 10 February 2017 (UTC)
Firefox and its endless updates and endless problemsThat's curious to me, because I've used it for over a decade, and never noticed it to be more problematic than other browsers. Indeed, I've noticed it to be significantly less problem prone than others. Also, all updates are automatic.If you're worried about breaking something during the install, don't. It literally takes just one button click to install it. Web browsers can be very complicated bits of software, but they're designed to be very modular and work across platforms. There are other options as well, such as Chrome, Safari or Dolphin. ᛗᛁᛟᛚᚾᛁᚱPants Tell me all about it. 20:00, 10 February 2017 (UTC)
Is there not some way when "Windows is searching for a solution" to tell me what it found? A few weeks ago I got a message about the update but don't know how to get to it now. It's not like it's in email.
There is a place to click to find out what updates I need. I clicked on that and now the updates are downloading. And I was just told to restart. I'll do it later, when I finish.— Vchimpanzee • talk • contributions • 21:27, 10 February 2017 (UTC)
Sigh... Perhaps we should close this section here. If the OP doesn't want to go through any trouble this helpdesk can't do anything. I suggest the OP brings his computer anywhere and have it fixed for a fee. That's probably not even that expensive... Jahoe ( talk) 23:55, 10 February 2017 (UTC)
Hi there, TheSandDoctor recently used a {{ help me}} template to ask for help on the Hollywood Pinball talk page, but I told them it would probably be best to ask their question here, so I'm posting a little message here pointing towards TheSandDoctor's message. I'll post it below to so you can see it here:
I was unable to find any credits for producer, programmers, designers, artists, etc. for Hollywood Pinball. If anyone could help locate them, be my guest and feel free to add them. Thanks!
— — Preceding text originally posted on Talk:Hollywood Pinball ( diff) by TheSandDoctor ( talk⋅ contribs) 23:50, 9 February 2017 (UTC)
If you can, please try and help them - if you can. Thanks! Seagull123 Φ 19:51, 10 February 2017 (UTC)
Computing desk | ||
---|---|---|
< February 9 | << Jan | February | Mar >> | February 11 > |
Welcome to the Wikipedia Computing Reference Desk Archives |
---|
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
Does something like a "statistically intractable" set of problems exist? That is, problems that can be solved in polynomial time with a non-statistically approach, but cannot be tackled with stats?-- Terurme ( talk) 12:36, 10 February 2017 (UTC)
It is deceptively difficult with calculus.In your example, the period would actually be 2d if d were the diameter of a circle which followed the curve of each peak or valley, because it takes a peak and valley pair to make 1 period. But you said a period of d, so I'll go with that. So, assuming the semicircular shape you seemed to be assuming (and which is common for corrugated steel) for the sine wave produced in this way, the answer is actually fairly trivial to calculate using basic algebra:
S = 1/2dΠ(l/d)
where S is the length of steel required. That being said, sine waves don't generally form perfect semicircles out of their peaks and valleys so one is forced to do a lot more work to model a realistic sine wave. And yes, this is (to the best of my knowledge) very difficult to do in calculus, but very easy to do with a loop.
ᛗᛁᛟᛚᚾᛁᚱPants
Tell me all about it. 15:07, 10 February 2017 (UTC)
The trick is getting that specific arc length on the last semicircle.If you're saying that l/d must be an integer, then yes; it's very tricky and requires calculus. If you're saying the last semicircle is going to have a diameter of l%d (note this is programming notation, % is the modulus operator), then it's a little tricky but not too bad (still better to do with a loop, but fairly easy with algebra).
And I did purposely make the problem much easier. In the original, the width of each semicircle was d and the height was h - so they weren't actually semicircles. They were ellipses. I found that complication to be silly.I figured it was on purpose, to make it easier to explain. It's pretty rare for the frequency and amplitude of a wave to be exactly the same. The answer I provided only works when that is the case, naturally. I think I could work out how to do it algebraically, but despite being a programmer, I've never been very good at math and I don't want to make my brain hurt. And I'd probably get it wrong, anyways (note how I had to correct my formula above from d/l to l/d). ᛗᛁᛟᛚᚾᛁᚱPants Tell me all about it. 15:43, 10 February 2017 (UTC)
I have Windows 10 and Microsoft Edge and recently went through a major software upgrade with a message saying to restart my computer and wait approximately 90 minutes for the updates to take effect. All I know about the change is that my slow Internet has gotten faster, though I made no changes that should have made that happen. I turn off the computer these days with the button that tells it to sleep, so it comes on in the middle of the night. Apparently an update of some kind has taken place.
Yesterday it seemed like every web site I went to gave me "yahoo.com is not responding" with a button to "recover webpage". If I clicked on the button I got a message with a green line moving back and forth saying Windows was searching for a solution. If they found one, they didn't tell me. Most of the time the problem cleared up quickly and I never had to click on the "recover webpage" button or anything else.
Most sites work--eventually. Some are faster than others. Some never give me the message. McClatchy Newspapers sites sometimes won't let me go to articles, but I found a workaround by right-clicking and copying the link and then pasting. With these sites, the page will disappear and then come back. tunegenie.com will update the playlist but I can't listen to the radio station; it never stops "buffering" and the blue circle just keeps on turning.
I do have some hints. I signed in to radioinsight.com a few minutes ago and got some javascript error. It didn't stop me from signing in but I was never able to "agree to terms", which was something I had to do today for some reason. I also could not ask a new question here by clicking on the ask a question button.— Vchimpanzee • talk • contributions • 18:15, 10 February 2017 (UTC)
[your] slow Internet has gotten faster, though [you] made no changesis that the browser (Edge) was updated and in the process the browser cache was cleared; in which case, the connection has not really gotten faster, but the browser has. This definitely happened to me with a previous version of Firefox, although there is no real reason that cache-clearing improves your situation, even with a large cache size. Tigraan Click here to contact me 19:01, 10 February 2017 (UTC)
Firefox and its endless updates and endless problemsThat's curious to me, because I've used it for over a decade, and never noticed it to be more problematic than other browsers. Indeed, I've noticed it to be significantly less problem prone than others. Also, all updates are automatic.If you're worried about breaking something during the install, don't. It literally takes just one button click to install it. Web browsers can be very complicated bits of software, but they're designed to be very modular and work across platforms. There are other options as well, such as Chrome, Safari or Dolphin. ᛗᛁᛟᛚᚾᛁᚱPants Tell me all about it. 20:00, 10 February 2017 (UTC)
Is there not some way when "Windows is searching for a solution" to tell me what it found? A few weeks ago I got a message about the update but don't know how to get to it now. It's not like it's in email.
There is a place to click to find out what updates I need. I clicked on that and now the updates are downloading. And I was just told to restart. I'll do it later, when I finish.— Vchimpanzee • talk • contributions • 21:27, 10 February 2017 (UTC)
Sigh... Perhaps we should close this section here. If the OP doesn't want to go through any trouble this helpdesk can't do anything. I suggest the OP brings his computer anywhere and have it fixed for a fee. That's probably not even that expensive... Jahoe ( talk) 23:55, 10 February 2017 (UTC)
Hi there, TheSandDoctor recently used a {{ help me}} template to ask for help on the Hollywood Pinball talk page, but I told them it would probably be best to ask their question here, so I'm posting a little message here pointing towards TheSandDoctor's message. I'll post it below to so you can see it here:
I was unable to find any credits for producer, programmers, designers, artists, etc. for Hollywood Pinball. If anyone could help locate them, be my guest and feel free to add them. Thanks!
— — Preceding text originally posted on Talk:Hollywood Pinball ( diff) by TheSandDoctor ( talk⋅ contribs) 23:50, 9 February 2017 (UTC)
If you can, please try and help them - if you can. Thanks! Seagull123 Φ 19:51, 10 February 2017 (UTC)