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• Advanced (?) Excel sorting

  - by Preston Grayskull

  First of all, I'd like to admit that I don't really know anything about Excel, but I have tried to look up a solution to this in Excel books and Googling. Here's what I'm trying to do: I have a really long spreadsheet There are 7 columns total, but only two columns that I'm most interested in. Here's an example CSV that is much more simple than my actual dataset, but the search/sort is analogous: John, Apple Dave, Apple Dave, Orange Steve, Apple Steve, Orange Steve, Kiwi Bob, Apple Bob, Banana I'm interested in extracting the entire rows (all of the columns) that meet the following criteria: ["Apple"] OR ["Apple" and "Orange"] NOT ["Apple" and "Orange" and Anything Else] NOT ["Apple" and Anything that isn't Orange] So with the above CSV, I would get the entire rows for John and Dave, but not Steve and not Bob. I started doing this manually, and will likely finish by the time this question has an answer, but I would like to know this for future reference. Thanks!

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• Localized database for customers

  - by Jim

  The company I work for, has just moved to AWS - and currently they have one very large central database with the instance currently located in America. However, one of their clients has requested that all of their data is held in the EU. So creating an AWS instance in Ireland isn't a problem, the problem is the database and how to manage it. We were considering having another database that runs in the EU for European customers, and use a different primary key step, so that the primary keys will never conflict in case the two locations need to be merged in the future. The problem is, if we have a customer that uses our system in both America, and the EU we would have to create 2 accounts for that user, and reporting across both regions would not be possible as the connection time would be too high. Is there an alternative to set this up?

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• What makes people think that NNs have more computational power than existing models?

  - by Bubba88

  I've read in Wikipedia that neural-network functions defined on a field of arbitrary real/rational numbers (along with algorithmic schemas, and the speculative `transrecursive' models) have more computational power than the computers we use today. Of course it was a page of russian wikipedia (ru.wikipedia.org) and that may be not properly proven, but that's not the only source of such.. rumors Now, the thing that I really do not understand is: How can a string-rewriting machine (NNs are exactly string-rewriting machines just as Turing machines are; only programming language is different) be more powerful than a universally capable U-machine? Yes, the descriptive instrument is really different, but the fact is that any function of such class can be (easily or not) turned to be a legal Turing-machine. Am I wrong? Do I miss something important? What is the cause of people saying that? I do know that the fenomenum of undecidability is widely accepted today (though not consistently proven according to what I've read), but I do not really see a smallest chance of NNs being able to solve that particular problem. Add-in: Not consistently proven according to what I've read - I meant that you might want to take a look at A. Zenkin's (russian mathematician) papers after mid-90-s where he persuasively postulates the wrongness of G. Cantor's concepts, including transfinite sets, uncountable sets, diagonalization method (method used in the proof of undecidability by Turing) and maybe others. Even Goedel's incompletness theorems were proven in right way in only 21-st century.. That's all just to plug Zenkin's work to the post cause I don't know how widespread that knowledge is in CS community so forgive me if that did look stupid. Thank you!

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• How do you pronounce Linux?

  - by Xerxes

  I'm tired of the old fart at work who keeps coming upto my desk and telling me all about his "years of experience in working with Unix and Lye-nix". I couldn't vent it out at him because that would be wrong, so I'm going to vent it out here - because obviously (that's the right thing to do...). Anyway, for all the people that practice in this disgusting behaviour - the pronunciation is.... (Hmmm - anyone know phonetics?) - "Li-nix" Note: Despite hating him for this - he is otherwise a very nice (but sometimes rather annoying) person. Now... to formally make this a "question" - Could someone write the phonetics for pronouncing "Linux", and also the notorious "Lye-nix", so I can make a note of it for future ventings? I think this is right... L?n?x, NOT L?n?x. ...or perhaps... L?n?x, NOT L?n?x* Can someone confirm the correct phonetics? (Listen to Linus on the matter).

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• Cloud based backup solutions based on open standards?

  - by Rick

  I am looking for a solution to backup and consolidate important media from a couple Windows laptops and Mac laptop. I would like a solutions that based on open standards, so my data isn't trapped by proprietary formats and proprietary protocols. I would like the ability to switch clients or change providers in the future. For example, something like Jungle Disk plus S3 sounds like a great option. However, I am having trouble confirming how or if this can be setup meeting this criteria. Are there any real or de-facto standards for treating S3 as a filesystem? If so, what Windows and Mac clients support these standards?

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• Using a time to set XY chart axis scaling like in 2003

  - by CookieOfFortune

  In Excel 2003, when you created a XY chart using time as an axis, you could set the scaling of these axes by typing in the date. In Excel 2007, you have to use the decimal version of the time (eg. How many days since some arbitrary earlier date). I was wondering if there was a way to avoid having to make such a calculation? A developer posted on a blog that this issue would be fixed in a future release, but all versions of Excel 2007 I have tried have not resolved this issue. The relevant quote: Those of you familiar with this technique of converting time to a decimal may recall that Excel 2003 allowed you to enter a date and time like “1/1/07 11:00 AM” directly in the axis option min/max fields and Excel would calculate the appropriate decimal representation. This currently does not work in Excel 2007 but will be fixed in a subsequent release.

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• Flash SWF not initializing until visible - can I force them to initialize?

  - by Jason

  I have an application that needs to render about 100 flash graphs (as well as other DOM stuff) in a series of rows that vertically extend many times beyond the current visible window - in other words, the users have to scroll down see see all the different graphs. This application is also dynamic and when a user changes a value in the DOM (anywhere on the page) it will need to propagate that change to all the Flash graphs at the same time. So I setup all the externalInterface callbacks and was careful to not let any JS start going until the ever-so-important "flashIsReady" call and...it worked great until I tried to update() the existing swf's with new data. Here was the behavior: - All the swfs load (initially) in both IE/Fox = good. - Updating swfs with new content works in IE but not in Fox = not good - Updating swfs with new content works in Fox --ONLY IF-- I scrolled down to the bottom of the page, then back to the top -- BEFORE -- I triggered an update(). So then I started tracing out each time a swf called the JS to say "flash is ready" and I realized, Firfox only renders swfs as they become visible. And To be honest - that's fine and actually, I am pretty sure that IE does this too. But the problem is that not only does Firefox not initialize the swf, Firefox doesn't even acknowledge the swf exists (expect for after onload) if it has not yet been visible. And the proof is that you get JS errors saying: "[FlashDOMID].FlashMethod is not a function". However, scroll down a little, wait until its visible and suddenly the trace starts lighting up "Flash Ready", "Flash Ready", "Flash Ready" and once they are all ready, everything works fine. Someone told me that FF does not init swf's until visible - can I force it? I can post code if you need...but its pretty heavy (hard to strip out the relevant from the rest) and I would like to avoid it (for your sakes) if possible. The question is simple - have you had this happen and if so, did you find a solution? Does anyone now how to force a not-yet-visible swf to initialize? Thanks guys.

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• Fast, reliable data transfers from/to China

  - by Nils

  We are a small company and we will need to transfer rather large amounts of data (10GB+ each time) between Europe and China in the near future. As many may have experienced, Internet connections to or from China can be rather unreliable and slow at times without any apparent reason. For example, while sending data to China via FTP generally works well, it can be painfully slow in the other direction. Currently, we are investigating new ways to have high transfer rates in both directions. So far we have tried: FTP (see above) FTP over VPN services (generally slower than direct connections) F2F (like Retroshare or Freenet - slow!!) Aspera (fast but expensive!) BitTorrent (unreachable end nodes, b/c of firewalls which we must not configure) We would like to try: Cloud storage (e.g. Amazon S3, Google Storage) - are those services always and reliably reachable from inside China? Point-to-Point VPN (currently not possible, b/c of the network, see above) I'd be especially grateful to hear from people who have already dealt with this kind of problem before.

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• What's Excel formats are (most) compatible with LibreOffice and Google Docs?

  - by iconoclast

  I use Excel (and occasionally Numbers), but I want to be able to share with users of Google Docs and LibreOffice (and I may want to switch in the future). What's the most compatible format to save my Excel spreadsheets in? I'm asking as a question here rather than merely Googling for a list of formats that LibreOffice and GoogleDocs support (although I'm doing that too, and will post the answer if no one else does) because there are likely to be hidden "gotchas" that only someone who has experience using all of the above applications is going to know about. Answers that include personal experience will be preferred over those that only post a link to the relevant facts on google.com and libreoffice.com. Oh, and of course the other reason I'm asking the question is because it's good to have this info readily available on SuperUser.com for anyone else who wants to know the same thing.

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• Request-local storage in ASP.NET (accessible to the code from IHttpModule implementation)

  - by IgorK

  I need to have some object hanging around between two events I'm interested in: PreRequestHandlerExecute (where I create an instance of my object and want to save it) and PostRequestHandlerExecute (where I want to get to the object). After the second event the object is not needed for my purposes and should be discarded either by storage or my explicit action. So the ideal context where my object should be stored is per request (with guaranteed no sharing issues when different threads are serving requests... or processes/servers :) ) Take into account that actual implementation I can do is being made from a HttpModule and is supposed to be a pluggable solution for already written web apps (so the option to provide some state using static/instance variables in Global.asax doesn't look good - I will have to modify Global.asax on every web application). Cache seems to be too broad for this use. I tried to see whether httpContext.Application (of type HttpApplicationState) is good for me or not, but cannot get whether it is exactly per HttpApplication instance or not (AFAIK you can have several instances of HttpApplications used on different threads and therefore serving several requests simultaneously - then using storage shared between threads will not work correctly; otherwise I would use it because one HttpApplication instance serves exactly one request at a time). Something could be done with storing state on the HttpModule instances if I know for sure that it's exactly bound 1-to-1 with every HttpApplication instance running (but again I need a proof that HttpApplication instance is 1-to-1 with my HttpModule's instance). Any valuable and reputable links on these topics are much appreciated... Would be great to find something particularly well-suited for per request situation (because otherwise I may end up with something ulgy... probably either some 'broader' scoped storage and some hacks to have different keys in the storage for different requests, OR using a thread-local thing and in this way commit to the theory that IIS/ASP.NET will not ever serve first event from one thread and the second event from the other thread and so on)

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• Solr/Lucene Scorer

  - by TFor

  We are currently working on a proof-of-concept for a client using Solr and have been able to configure all the features they want except the scoring. Problem is that they want scores that make results fall in buckets: Bucket 1: exact match on category (score = 4) Bucket 2: exact match on name (score = 3) Bucket 3: partial match on category (score = 2) Bucket 4: partial match on name (score = 1) First thing we did was develop a custom similarity class that would return the correct score depending on the field and an exact or partial match. The only problem now is that when a document matches on both the category and name the scores are added together. Example: searching for "restaurant" returns documents in the category restaurant that also have the word restaurant in their name and thus get a score of 5 (4+1) but they should only get 4. I assume for this to work we would need to develop a custom Scorer class but we have no clue on how to incorporate this in Solr. Another option is to create a custom SortField implementation similar to the RandomSortField already present in Solr. Maybe there is even a simpler solution that we don't know about. All suggestions welcome!

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• IPv6 in a Small Business

  - by Martyn

  I’ve been tasked to identify a new server and IT equipment for the company I work for (employees <20). I’m looking at getting a SBS 2011 Standard box. My Question is: Apart from ensuring that our router is IPv6 compliant, is there anything else I need to do/investigate to ensure that we won’t have IPv6 related problems in the future? When investigating this I can only find references to DNS Mangers etc. The SBS 2011 box will be used for exchange and remote log in access – it won’t be hosting any websites. Also will VOIP phone systems be affected by IPv6? (We are running a rather old VOIP system, would that need to be updated?

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• Is WEP used in conjunction with a wireless access list adequate security?

  - by LeopardSkinPillBoxHat

  I use a Netgear wireless router, with various wireless devices connecting to it. One of my wireless devices doesn't support WPA2 security, so I had to downgrade the security on the router to WEP. We all know WEP is broken, so as an added measure I enabled a wireless access list on the router so that only devices with specified MAC addresses which are in my access list are permitted to connect to the router. I know it is possible to spoof a MAC address from a device for the purposes of accessing a secure network like this. But is it easy? Is using WEP and a wireless access list good enough to prevent most hacking attacks? Or should I do whatever I can to ensure all devices support WPA2 in the future?

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• zero downtime during database scheme upgrade on SQL 2008

  - by eject

  I have web application on IIS7 with SQL server 2008 as RDBMS. Need get 0 downtime during future upgrades of ASP.NET code and DB schema as well. I need to get right scenario for this. I have 2 web servers and 2 sql servers and one http load balancer whcih allows to switch web backend server for web requests. Main goal is to make 1st web server and DB server up and running, update code and db schema on 2nd server and then switch all the requests to 2nd server and then main problem - how to copy data from 1st database 2nd (which was changed during upgrade).

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• Suggestions? Password & Encrypted Read/Write File like a Mac (.dmg or .SparseBundle) also R/W on Windows, Ubuntu

  - by Jeff Drew

  For years I have used .dmg or .sparsebundle (Encrypted and Password Protected) to safely keep home directory backups on my Mac. Now, I am looking for a similar Full Permissions/Read/Write that maintains an encrypted, and password protected file that it Tri-Platform. I'd like to have the future ability to use it on Mac OS X, Windows 7/8, and Ubuntu (current releases+). I appreciate your recommendations. Thank you. (I like mounting a DMG and having a file directory structure that can be easily maintained and organized. When done, un-mounting the file.) (I've seen Windows tools to open encrypted DMG files? and I will explore these options, but with the desire to also keep the file accessible on on three OSes, someone might have additional suggestions.)

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• Yum install packages to an alternate directory, without chroot?

  - by Stefan Lasiewski

  I would like to use the Foswiki yum repository to install Foswiki (296 packages). The default installation path is /var/lib/, but I want to install it to an alternate location at /opt/www/. In the future, I still want to use yum to check for and apply updates to the packages. Is it possible to use yum to install packages to an location which is different then the default location provided by RPMs? Does Yum provide anything similar to ./configure --prefix=/usr/local/ or rpm --install --prefix=/opt/local? Yum provides the --installroot option, but that appears to primarily for chroot environments.

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• Looking at desktop virtualization, but some users need 3D support. Is HP Remote Graphics a viable solution?

  - by Ryan Thompson

  My company is looking at desktop virtualization, and are planning to move all of the desktop compute resources into the server room or data center, and provide users with thin clients for access. In most cases, a simple VNC or Remote Desktop solution is adequate, but some users are running visualizations that require 3D capability--something that VNC and Remote Desktop cannot support. Rather than making an exception and providing desktop machines for these users, complicating out rollout and future operations, we are considering adding servers with GPUs, and using HP's Remote Graphics to provide access from the thin client. The demo version appears to work acceptably, but there is a bit of a learning curve, it's not clear how well it would work for multiple simultaneous sessions, and it's not clear if it would be a good solution to apply to non-3D sessions. If possible, as with the hardware, we want to deploy a single software solution instead of a mishmash. If anyone has had experience managing a large installation of HP Remote Graphics, I would appreciate any feedback you can provide.

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• tcp handshake failed.client send rst (after syn-ack). can any one advice?

  - by user1495181

  architecture: 2 linux computer connected . on the second (192.168.1.1) one run apache server . I have a small program that take tcp packets from nfqueue change the dst ip to 192.168.1.1 in case that the dst ip is 192.168.1.2 (i know that i can do it with iptables , but my program will do more things in the future), fix check sum and return to the queue. if i call to telnet 192.168.1.1 , means that my program dosnt need to do any manipulation, handshake is OK. If i call to telnet 192.168.1.2 , my program change the dest. server get the syn and return syn-ack, but right after getting the syn-ack the client send rst. Can anyone advice? wireshark of the telnet tcpdump of the telenet above

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• How to automatically set default quota limits for users on XFS filesystem, when the new account is created

  - by acidburn2k

  I guess the title explains the problem pretty well. Do you have an idea for a mechanism, which will automatically assign default quota values for every new account created (sort as the skel scheme works, but in this area)? Now, I am looking for a generic clean solution, not some ugly cron based scripts, or wrapper scripts for creating users. I would also like to avoid any external, unmaintained stuff (like forgotten pam modules, and such). Anything what could lead to overhead and extra work in future isn't really the solution, nor is checking for new accounts every minute.

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• Adding SSL to Heroku site post launch

  - by dineth

  I have a rails API that I want to deploy on Heroku. $20/month for a SSL site on heroku is a little steep given I am not earning anything out of this app yet. I am after advice and wondering if it is possible to add SSL sometime in the future? This is for a iOS app that I'm writing. Basically the idea would be that I continue to use https://myapp.heroku.com through their piggyback SSL. Once I get some cash in, I want to transition to using https://www.myapp.com. At this point the API would still need to work for app users who haven't upgraded to a new version of the app that points to the new domain. Anyone know if this is possible? Would both URLs continue to work? My gut feeling tells me this is not possible. Any advice would help. Thanks!

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• Extracting streaming video from swf

  - by user1018733

  I am trying to speed up this video by 1.25x to 1.5x, udacity style. I tried grabbing the http://smart.if.uidaho.edu/courses/f2012/cs512/ using the Download Flash & Video Firefox plugin, but it only grabbed the swf player that streams the video. Is there any other way to download this video? (as well as future videos). As a final solution, I can use video capture software while I'm not using the computer, but I don't want that hassle and time delay if possible.

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• How do you prove a function works?

  - by glenn I.

  I've recently gotten the testing religion and have started primarily with unit testing. I code unit tests which illustrate that a function works under certain cases, specifically using the exact inputs I'm using. I may do a number of unit tests to exercise the function. Still, I haven't actually proved anything other than the function does what I expect it to do under the scenarios I've tested. There may be other inputs and scenarios I haven't thought of and thinking of edge cases is expensive, particularly on the margins. This is all not very satisfying to do me. When I start to think of having to come up with tests to satisfy branch and path coverage and then integration testing, the prospective permutations can become a little maddening. So, my question is, how can one prove (in the same vein of proving a theorem in mathematics) that a function works (and, in a perfect world, compose these 'proofs' into a proof that a system works)? Is there a certain area of testing that covers an approach where you seek to prove a system works by proving that all of its functions work? Does anybody outside of academia bother with an approach like this? Are there tools and techniques to help? I realize that my use of the word 'work' is not precise. I guess I mean that a function works when it does what some spec (written or implied) states that it should do and does nothing other than that. Note, I'm not a mathematician, just a programmer.

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• Project specific help [closed]

  - by Sushant Jain

  Hi friends, I am in final year of engineering with Information Technology branch. I have to make my final year project based on Linux/UNIX platform. But until now i couldn't find any good project idea that will be useful for my future industrial career also. So please help me if you have any good project idea related to any field in Linux that gives us a leading edge in my career. and please suggest me sources that will be helpful to me in making that project. Thanks in advance.....

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• Can a consumer wireless router act as both a wireless client and access point?

  - by glibdud

  I'm going to be moving in the future, and integrating my home network into that of my landlord. I wish to maintain an isolated network while using his internet connection, so I'm planning on cascading my router off of his (WAN-to-LAN type configuration). Unfortunately, it looks like it might not be feasible to run a wire between the two. Therefore, I'd like to send my WAN connection over WiFi to his router. At my disposal, I have a WRT54GL (running Shibby's Tomato mod), and I just bought an Asus RT-N66U (I can be flexible with the firmware). My first thought was to set up the WRT as a wireless bridge, then run a wire between that and the N66U's WAN port. I'm reasonably sure I could make that work, but can I eliminate the WRT from the equation altogether? Can the N66U connect to the landlord's WiFi as a client, effectively using that as the WAN port, while simultaneously providing wireless access to my devices on an altogether different WLAN?

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• CentOS-Like configuration of Vim on Ubuntu

  - by matejkramny

  Whenever I use a CentOS System, there's always a pleasant configuration of vim which mainly does the following: Remembering position of closed files Colour mode (!!!) Bash has colours There's lots more, just not something i can recall on the spot. Then, i go to ubuntu and its all black and white, no nice vim config etc. I have to use Ubuntu, and I hate ubuntu because of this. I know I can all configure it by myself, so my question is: How can I configure the Ubuntu system to behave (aesthetically) like CentOS? PS to future self: I will be stoned to death for asking such a question.

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