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  • How to create a magic square in PHP?

    - by TerranRich
    I'd like to try my hand at creating a Magic Square in PHP (i.e. a grid of numbers that all add up to the same value), but I really don't know where to start. I know of the many methods that create magic square, such as starting "1" at a fixed position, then moving in a specific direction with each iteration. But that doesn't create a truly randomized Magic Square, which is what I'm aiming for. I want to be able to generate an N-by-N Magic Square of N² numbers where each row and column adds up to N(N²+1)/2 (e.g. a 5x5 square where all rows/columns add up to 65 — the diagonals don't matter). Can anybody provide a starting point? I don't want anybody to do the work for me, I just need to know how to start such a project? I know of one generator, written in Java (http://www.dr-mikes-math-games-for-kids.com/how-to-make-a-magic-square.html) but the last Java experience I had was over 10 years ago before I quickly abandoned it. Therefore, I don't really understand what the code is actually doing. I did notice, however, that when you generate a new square, it shows the numbers 1-25 (for a 5x5 square), in order, before quickly generating a fresh randomized square.

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  • How does the momentum/inertial scroll work with the Magic Mouse on NSScrollView?

    - by jbrennan
    When you scroll with the newer Apple Magic Mouse (at least on 10.6, I can't confirm any previous Mac OS) you get inertial scroll like scrolling on iPhone (that is, after a flick of the finger to scroll, it doesn't abruptly stop, but instead gradually slows down). This behaviour is "for free" with all NSScrollViews, it would appear. There are exceptional cases, such as Tweetie for Mac (I've heard Tweetie was written with a custom Table View class that works akin to how UITableView works on iPhone). My question is, how do the scroll views know how to do this inertial scrolling? My guess is the mouse [driver] repeatedly sends scroll events with a dampening scroll magnitude (or something like that) over the scroll period. But I'm not really sure how it works. I am having some scrolling problems in my scrollview class and I'm trying to figure out why (obviously we don't have the source code to Tweetie to see why it doesn't get the proper scrolling), but just trying to better understand how it works in order to fix my own problems.

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  • What is the magic behind perl read() function and buffer which is not a ref ?

    - by alex8657
    I do not get to understand how the Perl read($buf) function is able to modify the content of the $buf variable. $buf is not a reference, so the parameter is given by copy (from my c/c++ knowledge). So how come the $buf variable is modified in the caller ? Is it a tie variable or something ? The C documentation about setbuf is also quite elusive and unclear to me # Example 1 $buf=''; # It is a scalar, not a ref $bytes = $fh->read($buf); print $buf; # $buf was modified, what is the magic ? # Example 2 sub read_it { my $buf = shift; return $fh->read($buf); } my $buf; $bytes = read_it($buf); print $buf; # As expected, this scope $buf was not modified

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  • Install PHP mcrypt on Red Hat 4

    - by Chris
    I'm having a very hard time getting mcrypt for PHP installed on a Red Hat 4 server. I've downloaded the rpm but it tells me: error: Failed dependencies: php-common(x86-32) = 5.4.7-2.fc18 is needed by php-mcrypt-5.4.7-2.fc18.i686 rpmlib(FileDigests) <= 4.6.0-1 is needed by php-mcrypt-5.4.7-2.fc18.i686 libc.so.6(GLIBC_2.4) is needed by php-mcrypt-5.4.7-2.fc18.i686 libltdl.so.7 is needed by php-mcrypt-5.4.7-2.fc18.i686 rtld(GNU_HASH) is needed by php-mcrypt-5.4.7-2.fc18.i686 rpmlib(PayloadIsXz) <= 5.2-1 is needed by php-mcrypt-5.4.7-2.fc18.i686 So when I try to install one of those packages, they also require another 8 packages. So I'm diving into dependency hell here. Now if I try to compile mcrypt from source, this is what I get: checking for libmcrypt - version >= 2.5.0... no *** Could not run libmcrypt test program, checking why... *** The test program failed to compile or link. See the file config.log for the *** exact error that occured. This usually means LIBMCRYPT was incorrectly installed *** or that you have moved LIBMCRYPT since it was installed. In the latter case, you *** may want to edit the libmcrypt-config script: no configure: error: *** libmcrypt was not found But I was able to install libmcrypt from an rpm packages successfully. Any suggestions? Also, I cannot use up2date as it requires an active paid account from Red Hat and since the staff has changed rather rapidly in the last year where I work, no one knows if there even was any support accounts.

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  • Apple wireless mouse and keyboard doens't work

    - by drigoSkalWalker
    I paired the mouse and keyboard on ubuntu, but it seems not work. I got this error in /var/log/syslog kernel: [ 1875.935712] input: Apple Magic Mouse as /devices/pci0000:00/0000:00:12.0/usb4/4-3/4-3:1.0/bluetooth/hci0/hci0:2/input34 kernel: [ 1875.935885] evdev: no more free evdev devices kernel: [ 1875.935893] input: failed to attach handler evdev to device input34, error: -23 kernel: [ 1875.936049] magicmouse 0005:05AC:030D.0003: input,hidraw0: BLUETOOTH HID v3.06 Mouse [Apple Magic Mouse] on 00:19:5D:0F:4A:F6 kernel: [ 2334.787710] input: Apple Wireless Keyboard as /devices/pci0000:00/0000:00:12.0/usb4/4-3/4-3:1.0/bluetooth/hci0/hci0:4/input36 kernel: [ 2334.787729] evdev: no more free evdev devices kernel: [ 2334.787737] input: failed to attach handler evdev to device input36, error: -23 kernel: [ 2334.787999] generic-bluetooth 0005:05AC:0255.0005: input,hidraw1: BLUETOOTH HID v0.50 Keyboard [Apple Wireless Keyboard] on 00:19:5D:0F:4A:F6 Nothing appears in xinput --list, only the wired mouse and keyboard. How to fix that?

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  • How to disable SELinux in Red Hat?

    - by Neuquino
    I'm having some issues with shared libraries in a Red Hat installation, for example when I try to run sqlplus: error while loading shared libraries: /u01/app/oracle/product/11.2.0/db/lib/libclntsh.so.11.1: cannot restore segment prot after reloc: Permission denied How can permanently disable SELinux? Thanks in advance

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  • Passwords longer than 8 letter in Red Hat 4

    - by Oz123
    I have some machines with RHEL4 Nahant Update 6. Oddly, I found that passwords longer than 8 digits are not stored. So if I had a password 1ABCDEa!, and I changed it to 1ABCDEa!1ABCDEa! I could still log in to the machine with the old password. This machines use NIS authentication, but other machines with Red Hat 5 which use the same NIS server allow login ONLY with the NEW password (16 digits long...)!

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  • Major Analyst Report Chooses Oracle As An ECM Leader

    - by brian.dirking(at)oracle.com
    Oracle announced that Gartner, Inc. has named Oracle as a Leader in its latest "Magic Quadrant for Enterprise Content Management" in a press release issued this morning. Gartner's Magic Quadrant reports position vendors within a particular quadrant based on their completeness of vision and ability to execute. According to Gartner, "Leaders have the highest combined scores for Ability to Execute and Completeness of Vision. They are doing well and are prepared for the future with a clearly articulated vision. In the context of ECM, they have strong channel partners, presence in multiple regions, consistent financial performance, broad platform support and good customer support. In addition, they dominate in one or more technology or vertical market. Leaders deliver a suite that addresses market demand for direct delivery of the majority of core components, though these are not necessarily owned by them, tightly integrated, unique or best-of-breed in each area. We place more emphasis this year on demonstrated enterprise deployments; integration with other business applications and content repositories; incorporation of Web 2.0 and XML capabilities; and vertical-process and horizontal-solution focus. Leaders should drive market transformation." "To extend content governance and best practices across the enterprise, organizations need an enterprise content management solution that delivers a broad set of functionality and is tightly integrated with business processes," said Andy MacMillan, vice president, Product Management, Oracle. "We believe that Oracle's position as a Leader in this report is recognition of the industry-leading performance, integration and scalability delivered in Oracle Enterprise Content Management Suite 11g." With Oracle Enterprise Content Management Suite 11g, Oracle offers a comprehensive, integrated and high-performance content management solution that helps organizations increase efficiency, reduce costs and improve content security. In the report, Oracle is grouped among the top three vendors for execution, and is the furthest to the right, placing Oracle as the most visionary vendor. This vision stems from Oracle's integration of content management right into key business processes, delivering content in context as people need it. Using a PeopleSoft Accounts Payable user as an example, as an employee processes an invoice, Oracle ECM Suite brings that invoice up on the screen so the processor can verify the content right in the process, improving speed and accuracy. Oracle integrates content into business processes such as Human Resources, Travel and Expense, and others, in the major enterprise applications such as PeopleSoft, JD Edwards, Siebel, and E-Business Suite. As part of Oracle's Enterprise Application Documents strategy, you can see an example of these integrations in this webinar: Managing Customer Documents and Marketing Assets in Siebel. You can also get a white paper of the ROI Embry Riddle achieved using Oracle Content Management integrated with enterprise applications. Embry Riddle moved from a point solution for content management on accounts payable to an infrastructure investment - they are now using Oracle Content Management for accounts payable with Oracle E-Business Suite, and for student on-boarding with PeopleSoft e-Campus. They continue to expand their use of Oracle Content Management to address further use cases from a core infrastructure. Oracle also shows its vision in the ability to deliver content optimized for online channels. Marketers can use Oracle ECM Suite to deliver digital assets and offers as part of an integrated campaign that understands website visitors and ensures that they are given the most pertinent information and offers. Oracle also provides full lifecycle management through its built-in records management. Companies are able to manage the lifecycle of content (both records and non-records) through built-in retention management. And with the integration of Oracle ECM Suite and Sun Storage Archive Manager, content can be routed to the appropriate storage media based upon content type, usage data or other business rules. This ensures that the most accessed content is instantly available, and archived content is stored on a more appropriate medium like tape. You can learn more in this webinar - Oracle Content Management and Sun Tiered Storage. If you are interested in reading more about why Oracle was chosen as a Leader, view the Gartner Magic Quadrant for Enterprise Content Management.

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  • Magic key in Linux Kernel

    - by Masi
    What is the purpose of the following command? sudo echo t > /proc/sysrq-trigger I run it, but I can see no difference in the magic key and its output at dmesg. Trigger suggests me that the databases of sysrq are involved in the process.

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  • Fresh Red Hat Enterprise Linux fails to install httpd using yum

    - by Julian
    I'm trying to install a LAMP stack in a fresh red hat server but yum is misbehaving. Being linux illiterate I'm at a loss. $yum install httpd Loaded plugins: security Setting up Install Process No package httpd available. Nothing to do My yum config $ cat /etc/yum.conf [main] cachedir=/var/cache/yum keepcache=0 debuglevel=2 logfile=/var/log/yum.log distroverpkg=redhat-release tolerant=1 exactarch=1 obsoletes=1 gpgcheck=1 plugins=1 # Note: yum-RHN-plugin doesn't honor this. metadata_expire=1h # Default. # installonly_limit = 3 # PUT YOUR REPOS HERE OR IN separate files named file.repo # in /etc/yum.repos.d Other stuff in the yum.repos.d dir $ ls -lah /etc/yum.repos.d/ total 12K drwxr-xr-x 2 root root 4.0K Feb 4 01:15 . drwxr-xr-x 59 root root 4.0K Feb 4 01:28 .. -rw-r--r-- 1 root root 561 Mar 10 2010 rhel-debuginfo.repo What could be going on? I thought "out of the box" RHEL5.5 would be friendlier :)

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  • sudo/su command for Red Hat Server 5.4

    - by rednaxela
    Without going into too much detail, I need to execute one linux command on redhat with root user access. Red Hat Server 5.4 does not recognise the sudo command. The command su can be used to switch to the root user on redhat, but su cannot be done in one line. For example the command: su ; cd opt/storage/RootAccessFolder will not work because this only switches you to root, then executes the cd command once you have logged out from the root user. I guess what i'm looking for is like a.. sudo cd opt/storage/RootAccessFolder but I say again, sudo doesn't work. Any ideas?

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  • Successful SQL Injection despite PHP Magic Quotes

    - by Crimson
    I have always read that Magic Quotes do not stop SQL Injections at all but I am not able to understand why not! As an example, let's say we have the following query: SELECT * FROM tablename WHERE email='$x'; Now, if the user input makes $x=' OR 1=1 --, the query would be: SELECT * FROM tablename WHERE email='\' OR 1=1 --'; The backslash will be added by Magic Quotes with no damage done whatsoever! Is there a way that I am not seeing where the user can bypass the Magic Quote insertions here?

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  • Red Hat - Accept Self-Signed Certificates

    - by user552788
    Hi: Is there a way I can get a Red Hat Linux box to trust a self-signed certificate? e.g. wget https://example.com - gives an error that certificate is untrusted as 'https://example.com' has a self-signed certificate; with wget '--no-check-certificate' can over-ride checking of the certificate. But I would like to get the Red Hat to implicitly trust the self-signed certificate - is there a way to do this? Thanks.

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  • How do I make PHP's Magic __set work like a natural variable?

    - by Navarr
    Basically, what I want to do is create a class called Variables that uses sessions to store everything in it, allowing me to quickly get and store data that needs to be used throughout the entire site without working directly with sessions. Right now, my code looks like this: <?php class Variables { public function __construct() { if(session_id() === "") { session_start(); } } public function __set($name,$value) { $_SESSION["Variables"][$name] = $value; } public function __get($name) { return $_SESSION["Variables"][$name]; } public function __isset($name) { return isset($_SESSION["Variables"][$name]); } } However, when I try to use it like a natural variable, for example... $tpl = new Variables; $tpl->test[2] = Moo; echo($tpl->test[2]); I end up getting "o" instead of "Moo" as it sets test to be "Moo," completely ignoring the array. I know I can work around it by doing $tpl->test = array("Test","Test","Moo"); echo($tpl->test[2]); but I would like to be able to use it as if it was a natural variable. Is this possible?

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  • Configure Raid On Red Hat 5

    - by Sopolin
    Hi all, I have a problem with configure raid on red hat enterprise linux. The problem is when I create raid on two hard disks. It works successfully but after I remove one hard disk. It works normally. It means that I plug in one hard disk for testing configure raid. But after that I put both hard disks and create other file. The raid is cleared. My question is: Why do I turn off server machine, it clears raid that I configure first time before I turn off? Could anyone help to solve this problem? Thank, Ung Sopolin

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  • Red Hat 5.4 slow processing

    - by yucefrizk
    I'm running Red Hat Linux 5.4 on HP DL580 server with 16 processors and 64 GB of RAM. I'm connecting to the server remotely through SSH. after entering the password, it takes time to return the command line, if I click ctrl+c during this time, I'll have the command line prompt but not the correct bash prompt (I have to run bash to pass to my correct prompt). I tried to install Apache on the server, ./configure took 4 hours to finish instead of 1 or two minutes, Oracle installation same behavior. Server Disks are mirrored using RAID controller. any idea what could be the reason of this slowness?

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  • Clone a Red Hat RAID as part of a disaster recovery plan

    - by Campo
    I am looking for recommendations to clone a Red Hat mirrored raid to a single hard drive located in the same machine. The idea is if the servers hardware ever has an issue we have a similar hardware machine ready to go. All we would have to do is pop in the cloned drive. If the servers RAID ever failed we could just switch to the single drive to maintain uptime and restore the original configuration on the spare server with a backup. This is a restaurant and they are open 7 days a week. We do have time from 12:am to 9:00am to perform the necessary steps for a clone and we talking about under 10 Gigs of information. There is a database on the server. I have looked into Rsync and Clonezilla. But I am just not confident either is capable of completing the task I want. Looking for some suggestions and possibly a step by step if you could be so kind.

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  • Red Hat 6.5- sysctl -w net.ipv6.conf.default.accept_redirects=0

    - by kjbradley
    I am in the process of writing a Red Hat 6.5 Kickstart disc with hardened security. I have run a program to determine where the weaknesses are in my system, and apparently there is a medium severity problem by accepting IPV6 redirects. When I implement the following line in my post script in my kickstart, I can't access any websites externally with wget, or ssh/scp in from my computer. sysctl -w net.ipv6.conf.default.accept_redirects=0 Is there a workaround to this so that the system will still be hardened but I will be able to access systems that are external?

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  • Natural Search Engine Optimization - Don't "Game the System" Or You Will Get Banned!

    When focusing on natural search engine optimization, it is important that you keep the process "white hat." You see, when it comes to SEO, there are basically three schools of thought: White hat, Gray hat, and Black hat. As you can probably infer, white hat is following the rules, gray hat is a little in between, and black hat is going against parameters that Google and other major search engines have set for ethical SEO practices.

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