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  • Maths Question: number of different permutations

    - by KingCong
    This is more of a maths question than programming but I figure a lot of people here are pretty good at maths! :) My question is: Given a 9 x 9 grid (81 cells) that must contain the numbers 1 to 9 each exactly 9 times, how many different grids can be produced. The order of the numbers doesn't matter, for example the first row could contain nine 1's etc. This is related to Sudoku and we know the number of valid Sudoku grids is 6.67×10^21, so since my problem isn't constrained like Sudoku by having to have each of the 9 numbers in each row, column and box then the answer should be greater than 6.67×10^21. My first thought was that the answer is 81! however on further reflection this assume that the 81 number possible for each cell are different, distinct number. They are not, there are 81 possible numbers for each cell but only 9 possible different numbers. My next thought was then that each of the cells in the first row can be any number between 1 and 9. If by chance the first row happened to be all the same number, say all 1s, then each cell in the second row could only have 8 possibilites, 2-9. If this continued down until the last row then number of different permutations could be calculated by 9^2 * 8^2 * 7^2 ..... * 1^2. However this doesn't work if each row doesn't contain 9 of the same number. It's been quite a while since I studied this stuff and I can't think of a way to work it out, I'd appreciate any help anyone can offer.

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  • Distributed version control systems merge easiness details

    - by Idsa
    I have just read Joel's blogpost concerning distributed version control systems and can't understand the main idea. He says that SVN thinks in terms of versions while Mercurial thinks in terms of changes. And, according to Joel, it solves merging problems. I heard this idea several times and still haven't conceived it. As I know, SVN's merging mechanism is based on changes (diffs) too. So what is the difference? I have no experience with distributed version control systems but I actively use SVN branching/merging and had no serious problems with it. Of course there are merging conflicts sometimes (when one piece of code was changed in both branches). But I see no way how this problem can be solved automatically by some kind of control version system.

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  • What database systems should an startup company consider?

    - by Am
    Right now I'm developing the prototype of a web application that aggregates large number of text entries from a large number of users. This data must be frequently displayed back and often updated. At the moment I store the content inside a MySQL database and use NHibernate ORM layer to interact with the DB. I've got a table defined for users, roles, submissions, tags, notifications and etc. I like this solution because it works well and my code looks nice and sane, but I'm also worried about how MySQL will perform once the size of our database reaches a significant number. I feel that it may struggle performing join operations fast enough. This has made me think about non-relational database system such as MongoDB, CouchDB, Cassandra or Hadoop. Unfortunately I have no experience with either. I've read some good reviews on MongoDB and it looks interesting. I'm happy to spend the time and learn if one turns out to be the way to go. I'd much appreciate any one offering points or issues to consider when going with none relational dbms?

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  • Why doesn't java.lang.Number implement Comparable?

    - by Julien Chastang
    Does anyone know why java.lang.Number does not implement Comparable? This means that you cannot sort Numbers with Collections.sort which seems to me a little strange. Post discussion update: Thanks for all the helpful responses. I ended up doing some more research about this topic. The simplest explanation for why java.lang.Number does not implement Comparable is rooted in mutability concerns. For a bit of review, java.lang.Number is the abstract super-type of AtomicInteger, AtomicLong, BigDecimal, BigInteger, Byte, Double, Float, Integer, Long and Short. On that list, AtomicInteger and AtomicLong to do not implement Comparable. Digging around, I discovered that it is not a good practice to implement Comparable on mutable types because the objects can change during or after comparison rendering the result of the comparison useless. Both AtomicLong and AtomicInteger are mutable. The API designers had the forethought to not have Number implement Comparable because it would have constrained implementation of future subtypes. Indeed, AtomicLong and AtomicInteger were added in Java 1.5 long after java.lang.Number was initially implemented. Apart from mutability, there are probably other considerations here too. A compareTo implementation in Number would have to promote all numeric values to BigDecimal because it is capable of accommodating all the Number sub-types. The implication of that promotion in terms of mathematics and performance is a bit unclear to me, but my intuition finds that solution kludgy.

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  • stripping random number with substr problem

    - by Jim
    Using a random number to be included with another character. Then I want to strip out the random number and just leave the other character. I have this code that generates the random number (8 characters long) consistently. If you hit your refresh button multiple times, the “ID” field disappears even though the “Random Number” plus “ID” are still there. Not sure what is happening to the random number on refresh in the substr function. This is the code: // Begin Create Random ID Code ///////////////////////////////////////// function gRanStr1() { $length1 = 8; $characters = “0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ”; for ($p = 0; $p < $length1; $p++) { $lcrs1 .= $characters[mt_rand(0, strlen($characters)-1)]; } $lcrs9 = str_replace(' ', '', $lcrs9); return $lcrs1; } // End Create Random ID Code ///////////////////////////////////////// // Begin Decode Random ID Code ///////////////////////////////////////// $TrkR99 = "c"; $ResHeadID = gRanStr1() . $TrkR99; $ResHeadID = preg_replace('/[\s]+/',' ',$ResHeadID); echo "”; echo $ResHeadID . ” = echo of Random Number plus ID“; for($i=0; $i if ($ResHeadID == "") { ""; } else { $ResHeadID = preg_replace('/[\s]+/',' ',$ResHeadID); $TrkRa1 = substr($ResHeadID, $Index1 + 8, 1); } $dTrkRes = $TrkRa1; echo $TrkRa1 . " = echo of ID after random number stripped.“; echo “”; // End Decode Random ID Code /////////////////////////////////////////

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  • c# STILL returning wrong number of cores

    - by Justin
    Ok, so I posted in In C# GetEnvironmentVariable("NUMBER_OF_PROCESSORS") returns the wrong number asking about how to get the correct number of cores in C#. Some helpful people directed me to a couple of questions where similar questions were asked but I have already tried those solutions. My question was then closed as being the same as another question, which is true, it is, but the solution given there didn't work. So I'm opening another one hoping that someone may be able to help realising that the other solutions DID NOT work. That question was How to find the Number of CPU Cores via .NET/C#? which used WMI to try to get the correct number of cores. Well, here's the output from the code given there: Number Of Cores: 32 Number Of Logical Processors: 32 Number Of Physical Processors: 4 As per my last question, the machine is a 64 core AMD Opteron 6276 (4x16 cores) running Windows Server 2008 R2 HPC edition. Regardless of what I do Windows always seems to return 32 cores even though 64 are available. I have confirmed the machine is only using 32 and if I hardcode 64 cores, then the machine uses all of them. I'm wondering if there might be an issue with the way the AMD CPUs are detected. FYI, in case you haven't read the last question, if I type echo %NUMBER_OF_PROCESSORS" at the command line, it returns 64. It just won't do it in a programming environment. Thanks, Justin UPDATE: Outputting PROCESSOR_ARCHITECTURE returns AMD64 from the command line, but x86 from the program. The program is 32-bit running on 64-bit hardware. I was asked to compile it to 64-bit but it still shows 32 cores.

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  • Advice on pursuing a masters in information systems or computer science

    - by phantom
    I wanted some advice about pursuing a graduate program. I was recently accepted into a masters in computer science but I do have about 2 years of pre-reqs to complete. However, I attained my undergrad in information systems. I originally applied to computer science because I felt it provided me with more technical knowledge necessary in today's market. I would like to know if you feel four years would be worth it to attain a masters in computer science or spend two years completing attaining a masters in information systems. Thank you! I appreciate your kind response!

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  • Windows Server 2008 R2 Print Server - Change Printer Names on All Client Systems

    - by Jeramy
    I have a Windows Server 2008 R2 print server set up hosting out multiple printers to my end users. I would like to change the naming convention for all of the printers hosted on the print server and want this change reflected on the client end. For example: I have a HP4000 printer named "Cottage" on the print server. I want to rename the printer "HR-1stFloor-220a" on the print server and I want this printer to appear on every client system with the new name. Simply renaming the printer on the server automatically creates a link from the old printer name to the new one, so all the clients work but the actual name, from their perspective, has not changed. Renaming the share name also does not visibly effect the end user (though it does update the port information). I would like to have the names of the printers be meaningful information regarding department and location, but this means that when they change hands or move I would need to update this information, and currently I am not seeing a way short of writing custom start-up scripts and remove/replacing them through AD. Is there a simple way of accomplishing this task? Thank you for your help.

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  • Anticipating JavaOne 2012 – Number 17!

    - by Janice J. Heiss
    As I write this, JavaOne 2012 (September 30-October 4 in San Francisco, CA) is just over a week away -- the seventeenth JavaOne! I’ll resist the impulse to travel in memory back to the early days of JavaOne. But I will say that JavaOne is a little like your birthday or New Year’s in that it invites reflection, evaluation, and comparison. It’s a time when we take the temperature of Java and assess the world of information technology generally. At JavaOne, insight and information flow amongst Java developers like no other time of the year.This year, the status of Java seems more secure in the eyes of most Java developers who agree that Oracle is doing an acceptable job of stewarding the platform, and while the story is still in progress, few doubt that Oracle is engaging strongly with the Java community and wants to see Java thrive. From my perspective, the biggest news about Java is the growth of some 250 alternative languages for the JVM – from Groovy to Jython to JRuby to Scala to Clojure and on and on – offering both new opportunities and challenges. The JVM has proven itself to be unusually flexible, resulting in an embarrassment of riches in which, more and more, developers are challenged to find ways to optimally mix together several different languages on projects.    To the matter at hand -- I can say with confidence that Oracle is working hard to make each JavaOne better than the last – more interesting, more stimulating, more networking, and more fun! A great deal of thought and attention is being devoted to the task. To free up time for the 475 technical sessions/Birds of feather/Hands-on-Labs slots, the Java Strategy, Partner, and Technical keynotes will be held on Sunday September 30, beginning at 4:00 p.m.   Let’s not forget Java Embedded@JavaOne which is being held Wednesday, Oct. 3rd and Thursday, Oct. 4th at the Hotel Nikko. It will provide business decision makers, technical leaders, and ecosystem partners important information about Java Embedded technologies and new business opportunities.   This year's JavaOne theme is “Make the Future Java”. So come to JavaOne and make your future better by:--Choosing from 475 sessions given by the experts to improve your working knowledge and coding expertise --Networking with fellow developers in both casual and formal settings--Enjoying world-class entertainment--Delighting in one of the world’s great cities (my home town) Hope to see you there!

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  • The number of soft 404 errors is increasing because of redirects to the home page

    - by Stevie G
    I have an increase in soft 404 errors. Using Apache in my .htaccess file I have: Redirect 301 /test.html? /page/pop/test Redirect 301 /about.html? /about I have also tried: Redirect 301 http://www.example.co.za/test.html? http://www.example.co.za/services/test however whenever I go to: http://www.example.co.za/test.html http://www.example.co.za/about.html it just redirects to the home page I also have: RewriteRule ^.*$ index.php [NC,L] in .htaccess

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  • ID number for sites [closed]

    - by Jonathan
    Possible Duplicate: please add a key fields to stackauth results It would be easier if sites each had an ID, it help with keeping track of them, not only in a numerical way (which is generally easier and smaller than using name strings). Also changes of site names (such as when a site progresses from beta, or decides it's name is not quite right during beta). Everything else has IDs so why not sites?

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  • optimizing operating systems to provide maximum informix performance.

    - by Frank Developer
    Are there any Informix-specific guides for optimizing any operating system where an ifx engine is running? For example, in Linux, strip-down to a bare minimum all unecessary binaries, daemons, utilities, tune kernel parameters, optimize raw and cooked devices (hdparm). Someday, maybe, informix can create its own proprietary PICK-like O/S. The general idea is for the OS where ifx sits on have the smallest footprint, lowest overhead impact on ifx and provide optimized ifx performance.

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  • Solving Euler Project Problem Number 1 with Microsoft Axum

    - by Jeff Ferguson
    Note: The code below applies to version 0.3 of Microsoft Axum. If you are not using this version of Axum, then your code may differ from that shown here. I have just solved Problem 1 of Project Euler using Microsoft Axum. The problem statement is as follows: If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23. Find the sum of all the multiples of 3 or 5 below 1000. My Axum-based solution is as follows: namespace EulerProjectProblem1{ // http://projecteuler.net/index.php?section=problems&id=1 // // If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. // The sum of these multiples is 23. // Find the sum of all the multiples of 3 or 5 below 1000. channel SumOfMultiples { input int Multiple1; input int Multiple2; input int UpperBound; output int Sum; } agent SumOfMultiplesAgent : channel SumOfMultiples { public SumOfMultiplesAgent() { int Multiple1 = receive(PrimaryChannel::Multiple1); int Multiple2 = receive(PrimaryChannel::Multiple2); int UpperBound = receive(PrimaryChannel::UpperBound); int Sum = 0; for(int Index = 1; Index < UpperBound; Index++) { if((Index % Multiple1 == 0) || (Index % Multiple2 == 0)) Sum += Index; } PrimaryChannel::Sum <-- Sum; } } agent MainAgent : channel Microsoft.Axum.Application { public MainAgent() { var SumOfMultiples = SumOfMultiplesAgent.CreateInNewDomain(); SumOfMultiples::Multiple1 <-- 3; SumOfMultiples::Multiple2 <-- 5; SumOfMultiples::UpperBound <-- 1000; var Sum = receive(SumOfMultiples::Sum); System.Console.WriteLine(Sum); System.Console.ReadLine(); PrimaryChannel::ExitCode <-- 0; } }} Let’s take a look at the various parts of the code. I begin by setting up a channel called SumOfMultiples that accepts three inputs and one output. The first two of the three inputs will represent the two possible multiples, which are three and five in this case. The third input will represent the upper bound of the problem scope, which is 1000 in this case. The lone output of the channel represents the sum of all of the matching multiples: channel SumOfMultiples{ input int Multiple1; input int Multiple2; input int UpperBound; output int Sum;} I then set up an agent that uses the channel. The agent, called SumOfMultiplesAgent, received the three inputs from the channel sent to the agent, stores the results in local variables, and performs the for loop that iterates from 1 to the received upper bound. The agent keeps track of the sum in a local variable and stores the sum in the output portion of the channel: agent SumOfMultiplesAgent : channel SumOfMultiples{ public SumOfMultiplesAgent() { int Multiple1 = receive(PrimaryChannel::Multiple1); int Multiple2 = receive(PrimaryChannel::Multiple2); int UpperBound = receive(PrimaryChannel::UpperBound); int Sum = 0; for(int Index = 1; Index < UpperBound; Index++) { if((Index % Multiple1 == 0) || (Index % Multiple2 == 0)) Sum += Index; } PrimaryChannel::Sum <-- Sum; }} The application’s main agent, therefore, simply creates a new SumOfMultiplesAgent in a new domain, prepares the channel with the inputs that we need, and then receives the Sum from the output portion of the channel: agent MainAgent : channel Microsoft.Axum.Application{ public MainAgent() { var SumOfMultiples = SumOfMultiplesAgent.CreateInNewDomain(); SumOfMultiples::Multiple1 <-- 3; SumOfMultiples::Multiple2 <-- 5; SumOfMultiples::UpperBound <-- 1000; var Sum = receive(SumOfMultiples::Sum); System.Console.WriteLine(Sum); System.Console.ReadLine(); PrimaryChannel::ExitCode <-- 0; }} The result of the calculation (which, by the way, is 233,168) is sent to the console using good ol’ Console.WriteLine().

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  • Weird .#filename files on remote ssh-connected systems after mcedit

    - by etranger
    I'm using MacFusion sshfs in combination with Midnight Commander, and when I edit remote text files with mcedit, weird symlinks are created on the remote system. $ ls -l .* lrwxr-xr-x 1 user group 34 Jun 27 01:54 .#filename.txt -> [email protected] where etranger is my local login name, and mbp is a hostname of my notebook running MacOS. symlinks can be removed by running remote rm command, but cannot be deleted on the mac-fuse mounted volume and thus pollutes the filesystem. I cannot figure what part of software is responsible for this, and how I could fix this, any help is appreciated. EDIT: This appears to be mcedit behavior as documented here: https://dev.openwrt.org/ticket/8245 Apparently, sshfs fails to remove symlink to the lock file for some reason (".#" in filename, perhaps), and it pollutes the filesystem. A quick workaround is possible, using another bug of Midnight Commander: editing (F4) the broken symlink effectively converts it to a missing lock file it was supposed to point to, and removes the symlink itself. The newly created file may then be deleted normally. EDIT 2: Unchecking "Follow symlink" in MacFusion apparently allows sshfs to remove dead symlinks, so the problem disappears completely.

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  • Empathy chat limits the number of contacts displayed?

    - by Ka7anax
    I'm using Empathy Chat with these accounts: GTalk & Facebook. I just noticed now that from my GTalk friends only 6 appear online (including me) and in reality online are 14 (checked on GMail). And from Facebook it displays 44. So is Empathy Chat limited to display only 50 contacts? I looked through the settings and didn't see anything like this :| The worst part is that I have 1 GTalk contact as Favorite and it's not in the list... Is it a bug? PS: I'm using Ubuntu 10.10

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  • grep pattern interpretted differently in 2 different systems with same grep version

    - by Lance Woodson
    We manufacture a linux appliance for data centers, and all are running fedora installed from the same kickstart process. There are different hardware versions, some with IDE hard drives and some SCSI, so the filesystems may be at /dev/sdaN or /dev/hdaN. We have a web interface into these appliances that show disk usage, which is generated using "df | grep /dev/*da". This generally works for both hardware versions, giving an output like follows: /dev/sda2 5952284 3507816 2137228 63% / /dev/sda5 67670876 9128796 55049152 15% /data /dev/sda1 101086 11976 83891 13% /boot However, for one machine, we get the following result from that command: Binary file /dev/sda matches It seems that its grepping files matching /dev/*da for an unknown pattern for some reason, only on this box that is seemingly identical in grep version, packages, kernel, and hardware. I switched the grep pattern to be "/dev/.da" and everything works as expected on this troublesome box, but I hate not knowing why this is happening. Anyone have any ideas? Or perhaps some other tests to try?

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  • How much should a Systems Administrator be making?

    - by Curtis
    Hello, I'm a Sys Admin for a small (but successful and growing) company (~60 employees). I've got roughly 5-6 years of actual sys admin experience, plus another 5+ years of lower level work in the industry. I'm responsible for most everything above a helpdesk level in the company (server[windows]/network[cisco]/firewall/SAN[emc] setup/configuration/maintenance/troubleshooting), lead many projects, analyze system data -- I'm sure you've heard it all before...I have a bunch of certs, most are just "nice to have", but the ones that actually apply to my role are CCNA, MSCE, VCP (VMware). If things go wrong, I'm first in line to resolve the issue. I'm not management (no one reports to me). I've seen many of these sorts of questions online before, and I know the typical response is "too many variables, depends on location, industry type" etc etc. I'm just wondering (ballpark) what I should be looking for. I've tried to give as much detail as I can, but if I'm missing something, I'd be glad to post it. Thanks anyone.

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