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  1. E

    proving something in NP

    My point is, if you prove that verification cannot be done in polynomial time, then the problem is not in NP. It doesn't matter if P=NP (your "Assuming P != NP" statement isn't required).
  2. E

    proving something in NP

    If you can prove that it cannot be verified in polynomial time then that would show the problem is not in NP. This is regardless of whether P=NP. Remember that P is the set of decision problems that can be solved in polynomial time while NP is the set of problems whose solutions can be...
  3. E

    proving something in NP

    No, the solution has to be verifiable in polynomial time. I wrote a long post about P vs NP awhile ago, I'll just link it here: http://forums.anandtech.com/showpost.php?p=30874851&postcount=5
  4. E

    Detecting spread spectrum

    Well detecting it is just a matter of having a receiver sensitive enough to see the spread signal. For example if you point a big enough dish at a GPS satellite you'll be able to see the chips being sent down directly (while normally you'd just see noise from a small antenna). Of course if the...
  5. E

    Unfamiliar with selling stock and taxes implications...

    Taking that section bit by bit: You have no tax liability from buying the stock. (This differs from other stock transactions where if you purchase the stock below the fair market value, you are taxed on the difference as income.) You have to wait 2 years + 1 day after your enrollment date...
  6. E

    Trellis Modulation

    I haven't studied TCM but this looks like a good read on it: http://complextoreal.com/wp-content/uploads/2013/01/tcm.pdf It looks like TCM isn't a particularly simple modulation scheme so it may not be reasonable to expect a simple analogy for it (or at least not an accurate one).
  7. E

    Did I pull a jaw muscle?

    I've had similar pain before, I figured it was a TMJ problem but never bothered get it checked out. Went away after a week or so. Hurts a lot when you eat in the meantime, though, so take NSAIDs as necessary.
  8. E

    Instead of emailing 100 people using "BCC", is there a service that emails indiv?

    Look up mail merge. There are many such options (I use https://code.google.com/p/valmerge/).
  9. E

    How to identify RAM chips on PCB?**How do you line these things up????**

    Probably your best bet will be to Google whatever markings you can see on the chip. If you can't see any markings or Google turns up nothing, you're probably not going to get far.
  10. E

    Binary search question...

    I tried this out and it worked fine (made a python version). So we have: A = [2, 4, 6, 8, 10, 12] key = 5 imin = 0 imax = 5 So let's go through the iterations (just going to print imin, imax, imid on each iteration, where imid = (imin + imax)/2): 0 5 2 0 1 0 1 1 1 key not found...
  11. E

    Occupation Thread

    Job: Software engineer Dream job: Teacher of some type. Was a TA in college and enjoyed it thoroughly, helping people is the most satisfying thing. Unfortunately it doesn't pay well.
  12. E

    Is coding hard for you?

    Again this is so vague. If you're completely lost then you need to start from square one. Do you know what a variable is? Do you understand data types? Flow control? Functions? You really need to be conversant in the syntax of a language before you can go anywhere (e.g., understanding a binary...
  13. E

    Is coding hard for you?

    Your question is too vague. Are you having trouble understanding the algorithms or data structures that you're writing? Or do you understand the algorithms and data structures, but do you not understand how to translate them into code? If it's the former, then that's hard. If it's the latter...
  14. E

    Pacific Rim....worthy? or not?

    I stand corrected, yes I also felt this was extremely dumb (the analog thing bothered me more perhaps since it was actually attempting to be technical while failing miserably). The wall wouldn't have been so bad if they'd done it the right way by walling up the fissure itself (say by turning the...
  15. E

    Pacific Rim....worthy? or not?

    I saw this yesterday, overall it was good for a mindless summer action flick. The acting is nothing special, but it isn't cringe-worthy (as in, say, Transformers), and the action and special effects are top notch. Plenty of the usual cliches (scene at the end when the hero's pod opens, scene...
  16. E

    Is MATLAB difficult to learn and know? (for future jobs)

    MATLAB is comparatively easy to learn because most MATLAB programs are simple procedural simulation scripts. I would suggest downloading Octave (which shares MATLAB's syntax and doesn't cost $2000) and trying things out. Usually the bottleneck for a MATLAB user is not the MATLAB programming...
  17. E

    Do employers really read cover letters? Or am I wasting my time writing them?

    I'd imagine for technical positions, cover letters are much less important (since they likely filter based on specific experience with languages/tools). For non-technical positions where requirements are softer, they may be more heavily weighed. However, even so, at worst the recruiter will...
  18. E

    pythonic way to write this?

    For just the code you wrote, the below code seems simpler (assumes that only one header will match at a time). For performance you could also compile the regular expressions before the loop, but not sure if you actually care about that or not. headers = ['header1', 'header2', 'header3'] for...
  19. E

    Favorite TV episodes/moments

    The West Wing - Two Cathedrals Superman: TAS - World's Finest (Parts 1-3) Futurama - The Luck of the Fryrish Breaking Bad - Live Free or Die
  20. E

    Join a membership type store like Costco for groceries?

    FYI, if you sign up for the executive membership and you get your rebate check at the end of the year and it is less than $55, you can go to Costco and ask them to refund the difference up to $55 (which is the difference between regular membership and executive membership).
  21. E

    So who invented this whole 'low impact exercise' myth?

    Well running isn't exactly low impact and I personally do have knee problems from running, but of course the fitness benefits undoubtedly outweigh the injury concerns. However, it is also true that jogging for 40 minutes isn't as efficient as doing high intensity intervals instead (e.g., 15...
  22. E

    Math - All those silly whats the right answer with order of operaiton

    The comment about left-to-right resolving the ambiguity is absolutely correct. Heck, there's a Wikipedia article on this: http://en.wikipedia.org/wiki/Operator_associativity
  23. E

    Star Trek Into Darkness: 86% at RT.com (Post reviews here!)

    Overall the movie was entertaining. I got a free screening this morning in 3D. I thought the 3D was pretty useless, more distracting than entertaining, but not overly so (didn't ruin the experience). Action was great, special effects were excellent, story was good enough, basically what you'd...
  24. E

    Getting started with Google Apps dev?

    Just create an account and download the SDK. You can use Go, Java, or Python (I've only used Python myself). The documentation is quite good. There is a limit on the size of the free service, so if you grow beyond a certain size expect to pay (see...
  25. E

    Funny / Interesting Interview / Training stories

    Had a guy a few months back that was so nervous he was literally sweating on my keyboard (for the coding questions we have them write some code on a laptop). He kept trying to wipe it off as he was typing, but I still had to wipe it down afterwards.
  26. E

    Does your dog learn names of people?

    Not my dog, but dogs in general are quite remarkable (I saw this story some time ago): http://www.northportlandvet.com/events/can-your-dog-correctly-identify-1022-different-toys/
  27. E

    how do I make a spill over char counter in C?

    I agree, just use a 64-byte integer (long long unsigned int or uint64_t if you're using C99, assuming a reasonable platform) and then use some bit operations to get the individual byte counters (write a getter function to abstract this). It's not clear from the question whether when you do 255...
  28. E

    physics dudes, i has question

    http://en.wikipedia.org/wiki/Antony_Garrett_Lisi http://en.wikipedia.org/wiki/An_Exceptionally_Simple_Theory_of_Everything
  29. E

    Cloud - quick explanation pleasr

    Well there are two cases here: those developing applications to run on cloud infrastructure, and those actually developing the cloud infrastructure. In reality they probably are looking for experience in developing applications that run on something like Amazon AWS, Microsoft Azure, Rackspace...
  30. E

    Any younger guys have experience buying a house?

    There's just a lot of risk. If it were just you, sure, but co-signing with a friend means that if one of you loses his job the other may be completely screwed. If in two years you guys are making closer to $90k each it may be an option (I assume you're around $75k right now). If you can put...
  31. E

    Recent graduate looking for advice

    You don't have to wait for an offer to learn about benefits. You'll just need to land a first round interview, then ask your interviewer about the company's benefits (or ask for an HR contact if s/he doesn't have the information you want). Of course, a higher salary can compensate for lower...
  32. E

    Recent graduate looking for advice

    Basically you need to get in to interviews and then do well in them. I assume if you're smart and prepare, you can do well in an interview. So the question is how to get offered the interview in the first place. There are two ways to do this in my experience as a new grad: 1. Have a good GPA...
  33. E

    FFT Low Pass Filtering methods

    I much prefer SciPy (and related tools) over Matlab. I gave up Matlab at my last job (where Matlab was pretty much entrenched) and went to Python cold turkey and had little trouble doing everything I needed to do in Python. The only way I'd use Matlab in the future is if I absolutely needed...
  34. E

    FFT Low Pass Filtering methods

    I think you have the idea for frequency-domain filtering. Window, take the FFT, zero components, and inverse FFT. Choosing the window function is pretty subjective based on what you want. You can play around with different ones until you get a result you like. One thing you could do since your...
  35. E

    How does a processor use just 1 bit?

    Here's a very simple description: http://en.wikipedia.org/wiki/1-bit_DAC This is a more in-depth discussion that will require some EE background: http://www.analog.com/static/imported-files/tutorials/MT-017.pdf
  36. E

    Professional Commmenting Conventions

    The company you go work at will likely have some style guidelines as to how and when you should comment. I generally try to comment on why I'm doing something, or what the expected behavior is, or any assumptions that I'm making when doing something (if I don't assert those assumptions for some...
  37. E

    Quitting my job this week. What to do about the 401k

    IRA
  38. E

    Power requirements

    You'll probably notice that your tablet charges very slowly (or maybe not at all under heavy use). That's the only issue you'll see.
  39. E

    PWM circuit to control 3-pin fan

    The idea behind PWM is that instead of generating a constant voltage, you generate pulses whose average value turns out to be the constant voltage you want. Typically then you want to average a PWM waveform once it hits an analog device to get a useful signal out of it. However, if the frequency...
  40. E

    Massive amount of phone minutes for one week - cheapest way?

    For 5 days go with a daily plan, not a monthly plan. For example, T-Mobile has unlimited talk+text for $2/day if you pay by the day: http://prepaid-phones.t-mobile.com/pay-by-the-day-cell-phone-plans EDIT: Quick Googling shows that Boost has basically an identical plan for $2/day.
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