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• MySQL Relational Database Foreign Key

  - by user623879

  To learn databasing, I am creating a movie database. To associate multiple directors with a movie, I have the following schema: movie(m_ID, ....) m_director(dirID, dirName)//dirID is a autoincrement primary key m_directs(dirID, m_ID) //dirID, m_ID are set as foreign Keys in the mysql database(InnoDB engine) I have a program that connects to the db that needs to add a movie to the database. I can easily add a new entry to the movie table and the m_director table, but I am having trouble adding a entry in the m_directs table. INSERT INTO m_director (dirName) VALUES("Jason Reitman"); INSERT INTO m_directs (dirID, m_ID) VALUES(LAST_INSERT_ID(), "tt0467406"); I am using this sql statement to insert a new director and add the association to the movie. I know the primary key of the movie, but I don't know the dirID, so I use LAST_INSERT_ID() to get the last id of the director just inserted. The problem I am having is that I get the following error: MySql.Data.MySqlClient.MySqlException (0x80004005): Cannot add or update a child row: a foreign key constraint fails (`siteproducts`. `m_directs`, CONSTRAINT `m_directs_ibfk_2` FOREIGN KEY (`dirID`) REFERENCES `m_directs` (`dirID`) ON DELETE CASCADE ON UPDATE CASCADE) Any ideas?

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• Do programmers need a union?

  - by James A. Rosen

  In light of the acrid responses to the intellectual property clause discussed in my previous question, I have to ask: why don't we have a programmers' union? There are many issues we face as employees, and we have very little ability to organize and negotiate. Could we band together with the writers', directors', or musicians' guilds, or are our needs unique? Has anyone ever tried to start one? If so, why did it fail? (Or, alternatively, why have I never heard of it, despite its success?) later: Keith has my idea basically right. I would also imagine the union being involved in many other topics, including: legal liability for others' use/misuse of our work, especially unintended uses evaluating the quality of computer science and software engineering higher education programs -- unlike many other engineering disciplines, we are not required to be certified on receiving our Bachelor's degrees evangelism and outreach -- especially to elementary school students certification -- not doing it, but working with the companies like ISC(2) and others to make certifications meaningful and useful continuing education -- similar to previous conferences -- maintain a go-to list of organizers and other resources our members can use I would see it less so as a traditional trade union, with little emphasis on: pay -- we tend to command fairly good salaries outsourcing and free trade -- most of use tend to be pretty free-market oriented working conditions -- we're the only industry with Aeron chairs being considered anything like "standard"

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• Web Shop Schema - Document Db

  - by Maxem

  I'd like to evaluate a document db, probably mongo db in an ASP.Net MVC web shop. A little reasoning at the beginning: There are about 2 million products. The product model would be pretty bad for rdbms as there'd be many different kinds of products with unique attributes. For example, there'd be books which have isbn, authors, title, pages etc as well as dvds with play time, directors, artists etc and quite a few more types. In the end, I'd have about 9 different products with a combined column count (counting common columns like title only once) of about 70 to 100 whereas each individual product has 15 columns at most. The three commonly used ways in RDBMS would be: EAV model which would have pretty bad performance characteristics and would make it either impractical or perform even worse if I'd like to display the author of a book in a list of different products (think start page, recommended products etc.). Ignore the column count and put it all in the product table: Although I deal with somewhat bigger databases (row wise), I don't have any experience with tables with more than 20 columns as far as performance is concered but I guess 100 columns would have some implications. Create a table for each product type: I personally don't like this approach as it complicates everything else. C# Driver / Classes: I'd like to use the NoRM driver and so far I think i'll try to create a product dto that contains all properties (grouped within detail classes like book details, except for those properties that should be displayed on list views etc.). In the app I'll use BookBehavior / DvdBehaviour which are wrappers around a product dto but only expose the revelent Properties. My questions now: Are my performance concerns with the many columns approach valid? Did I overlook something and there is a much better way to do it in an RDBMS? Is MongoDb on Windows stable enough? Does my approach with different behaviour wrappers make sense?

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• How to get the value of an XML element using Linq even when empty.

  - by Yeodave

  Please excuse my stupidity, I tend to find the traversing XML overly complicated. I am using ASP.NET in VB. I have an XML document which contains all the details of staff in my company... <staff> <staffName>Test Staff</staffName> <staffTitle>Slave</staffTitle> <staffDepartmentName>Finance</staffDepartmentName> <staffOffice>London</staffOffice> <staffEmail>[email protected]</staffEmail> <staffPhone>0207 123 456</staffPhone> <staffNotes>Working hours Mon to Thurs 9.15 - 5.15</staffNotes> <staffBio></staffBio> </staff> As you can see, some nodes do not always contain data for ever member of staff; only Directors have biographies. I access the values like this... For Each staff In ( _ From matches In myXMLFile.Descendants("staff").Descendants("staffName") _ Where matches.Nodes(0).ToString.ToLower.Contains(LCase(search)) _ Order By matches.Value _ Select matches) staffName = staff.Descendants("staffName").Nodes(0).ToString) staffTitle = staff.Descendants("staffTitle").Nodes(0).ToString) staffOffice = staff.Descendants("staffOffice").Nodes(0).ToString) staffEmail = staff.Descendants("staffEmail").Nodes(0).ToString) staffPhone = staff.Descendants("staffPhone").Nodes(0).ToString) staffNotes = staff.Descendants("staffNotes").Nodes(0).ToString) staffBio = staff.Descendants("staffBio").Nodes(0).ToString) ' Do something with that data... Next Once it gets to staffBio I get an error saying "Object reference not set to an instance of an object." obviously because that node does not exist. My question is how can I assign the value to a variable even when it is empty without having to do a conditional check before each assignment?

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• Thomson TCM 420 internal firewall deactivation

  - by KB22

  Hi all, I'm having a really hard time with getting a box into active torrent mode. Windows firewall etc. is done, the actual problem seems to relate to the cable modem which is used to connect the box to the net. It's a Thomson TCM 420 which 'claims' to have an internal firewall. IMHO this internal FW keeps me from using the port I opened for torrenting. To cut it short: is there a way to disable that firewall? The web administration interface of the modem does not provide that option. thanks in advance K

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• svn: unknown hostname for hostname that does indeed exist

  - by tipu

  I am running a centos 5 image on the vmware player and as of recently, I was able to check out from a repository that is no longer working. I am now getting: svn: Unknown hostname 'www.kennykong.com' It is a valid hostname and I know this because I have this svn location on Windows and I can browse/checkout no problem. After doing some searching I have (mostly blindly) assumed it's a DNS error because for i in 'grep nameserver /etc/resolv.conf | cut -d " " -f 2' ; do dig @$i domain.com ; done returns done ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5 <<>> @192.168.1.1 domain.com ; (1 server found) ;; global options: printcmd ;; connection timed out; no servers could be reached I am unsure what to do from here to get my centos to recognize more servers

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• HP Compaq nc8230 hackintosh?

  - by David

  I have an HP Compaq nc8230 with a Pentium M (1.86GHz, SSE2) 1.5GB RAM, and an ATI Mobility Radeon x600 (64MB dedicated, 596MB shared). I'm trying to install Mac OS X Leopard on it. I have a legal copy of Leopard from apple, so I tried using the generic.iso and putting in the Leo DVD when it tells me to. It gets to the Apple logo with the spinny thing for maybe 5 minutes, but then the computer just restarts. I don't get past the apple logo. Then I tried using iDeneb 1.3 (10.5.5) but it doesn't boot into the DVD. My computer just ignores it and moves onto the hard drive. I would appreciate some help with either methods (moat prefferably the more legal one), I really need an intel Mac, my PowerBook G4 just doesn't cut it.

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• Install RT Failed: DateTime >= 0.44 ...MISSING

  - by javano

  I am trying to install RT-4.0.5 (Request Tracker) but I keep getting the following output; $ make fixdeps <output cut> SOME DEPENDENCIES WERE MISSING. CORE missing dependencies: DateTime >= 0.44 ...MISSING make: *** [fixdeps] Error 1 The full output is here (it's quite long); http://pastebin.com/raw.php?i=Tn7GrkYw $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 8.04.4 LTS Release: 8.04 Codename: hardy $ perl --version This is perl 5, version 14, subversion 2 (v5.14.2) built for i686-linux $ cpan --version /usr/local/bin/cpan version 1.57 calling Getopt::Std::getopts (version 1.06 [paranoid]), running under Perl version 5.14.2. [Now continuing due to backward compatibility and excessive paranoia. See ``perldoc Getopt::Std'' about $Getopt::Std::STANDARD_HELP_VERSION.] Nothing to install! I can't see why this is a problem; $ cpan DateTime Going to read '/root/.cpan/Metadata' Database was generated on Thu, 08 Mar 2012 16:11:26 GMT DateTime is up to date (0.72).

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• Weird canvas/page size printing problem in Adobe Acrobat

  - by Justin

  I am trying to print a document in Adobe Acrobat. For some reason, Acrobat wants to print my document smaller than it actually is, despite having chosen that I DO NOT want the image to be scaled: http://www.freeimagehosting.net/image.php?945fbb3f41.png See the grey area on the top and left of the preview? That's the area that's getting cut off. Notice that the whole preview (INCLUDING the gray areas) is 8.5x11 in. Also look at the paper size, a nice 8.5x11 in. This happens for any real printer I connect to my computer. However, printing to a "fake" software printer is not a problem: Printing to a software printer: Use the above link but change the image name to this: 769eaf59ab.png Any ideas? I've tried messing with the paper sizes but no luck. I can't use "Shrink to printable area" because ultimately I'm doing this to print to a preprinted form (the same issue occurs when I select "Form fields only" but this demonstrates it better).

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• How to install mod_wsgi 3.1 on Ubuntu 9.10

  - by pthulin

  I have a Python 3 web app so mod_wsgi < 3.1 doesn't cut it for me. However, on my Ubuntu 9.10 installation there doesn't seem to be a package for mod_wsgi 3.1. Is there an alternative repository that has a package for mod_wsgi 3.1? There's a new Ubuntu release not so long from now, will it contain mod_wsgi 3.1? Some other distro ready with mod_wsgi 3.1 to recommend? Maybe my best bet is to compile it myself? From a quick google it looks like I only need the python and apache dev packages installed. Thanks!

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• The User Profile Service

  - by Daryl Gill

  I tried logging into my computer after an "ungraceful" shutdown due to a power cut.. I got prompted with a message stating the user profile service failed the login. After reading a k/b on Microsoft I managed to re-login to the "corrupt" account by making registery edits.. But the next step (After having the ability to logon) is a major concern for me.. Would the guys at superuser suggest: 1) Carry on using said account 2) Re-install Windows to eliminate the possible chance of a reoccouring problem 3) Migrate all user data over to a new account and with that being said above. I had to issue the command line: net user administrator /active:yes to activate the hidden adminstrator account, would it be recommended/secure to disable the account or leave it active?

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• nginx terminates connection after 65k bytes

  - by David Wolever

  I've got nginx configured as a front-end to a Python application running under gunicorn, but nginx is terminating connections after about 65k of data have been sent. For example, I've got a view which looks like this: def debug_big_file(request): return HttpResponse("x" * 500000) But when I access that URL through nginx, I only get 65283 bytes: $ curl https://example.com/debug/big-file | wc … curl: (18) transfer closed with outstanding read data remaining 0 1 65283 Note that everything works as expected when accessing gunicorn directly: $ curl http://localhost:1234/debug/big-file | wc … 0 1 500000 The relevant nginx config: location / { proxy_pass http://localhost:1234/; proxy_redirect off; proxy_headers_hash_bucket_size 96; } And nginx version 1.7.0 Some other facts: The number of bytes is consistent from request to request, but it varies based on the content (I first noticed it with a large PNG file, which was cut off after 65,372 bytes, not 65,283) 110k bytes are sent correctly (ie, "x" * 110000 returns all 110,000 bytes), but 120k bytes are not tcpdump suggests that nginx is sending a RST packet to gunicorn:

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• LSI RAID-on-chip with RAID6 over two SAS links goes red when HDD enclosure is powered cycled; how to recover?

  - by GregC

  I have a RAID6 array managed by LSI 9286-8e card. I also have Sans Digital 24-bay NexentaSTOR JBOD enclosure with SAS extender built-in. They are connected to separate UPS devices. Normally, I'd shut down the PC, leaving RAID6 in healthy state. But today the power to JBOD enclosure was cut but PC kept running. After restarting the PC, all disks in RAID6 have lit up RED, and the only option in LSI MegaRAID manager app was to reset each disk to unassigned, thereby loosing all data on RAID6 array. Thankfully, I am only testing, but how would I recover if this were to happen in production?

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• Three ways to upload/post/convert iMovie to YouTube

  - by user44251

  For Mac users, iMovie is probably a convenient tool for making, editing their own home movies so as to upload to YouTube for sharing with more people. However, uploading iMovie files to YouTube can't be always a smooth run, I did notice many people complaining about it. This article is delivered for guiding those who are haunted by the nightmare by providing three common ways to upload iMovie files to YouTube. YouTube and iMovie YouTube is the most popular video sharing website for users to upload, share and view videos. It empowers anyone with an Internet connection the ability to upload video clips and share them with friends, family and the world. Users are invited to leave comments, pick favourites, send messages to each other and watch videos sorted into subjects and channels. YouTube accepts videos uploaded in most container formats, including WMV (Windows Media Video), 3GP (Cell Phones), AVI (Windows), MOV (Mac), MP4 (iPod/PSP), FLV (Adobe Flash), MKV (H.264). These include video codecs such as MP4, MPEG and WMV. iMovie is a common video editing software application comes with every Mac for users to edit their own home movies. It imports video footage to the Mac using either the Firewire interface on most MiniDV format digital video cameras, the USB port, or by importing the files from a hard drive where users can edit the video clips, add titles, and add music. Since 1999, eight versions of iMovie have been released by Apple, each with its own functions and characteristic, and each of them deal with videos in a way more or less different. But the most common formats handled with iMovie if specialty discarded as far as to my research are MOV, DV, HDV, MPEG-4. Three ways for successful upload iMovie files to YouTube Solution one and solution two suitable for those who are 100 certainty with their iMovie files which are fully compatible with YouTube. For smooth uploading, you are required to get a YouTube account first. Solution 1: Directly upload iMovie to YouTube Step 1: Launch iMovie, select the project you want to upload in YouTube. Step 2: Go to the file menu, click Share, select Export Movie Step 3: Specify the output file name and directory and then type the video type and video size. Solution 2: Post iMovie to YouTube straightly Step 1: Launch iMovie, choose the project you want to post in YouTube Step 2: From the Share menu, choose YouTube Step 3: In the pop-up YouTube windows, specify the name of your YouTube account, the password, choose the Category and fill in the description and tags of the project. Tick Make this movie more private on the bottom of the window, if possible, to limit those who can view the project. Click Next, and then click Publish. iMovie will automatically export and upload the movie to YouTube. Step 4: Click Tell a Friend to email friends and your family about your film. You are also allowed to copy the URL from Tell a Friend window and paste it into an email you created in your favourite email application if you like. Anyone you send to email to will be able to follow the URL directly to your movie. Note: Videos uploaded to YouTube are limited to ten minutes in length and a file size of 2GB. Solution 3: Upload to iMovie after conversion If neither of the above mentioned method works, there is still a third way to turn to. Sometimes, your iMovie files may not be recognized by YouTube due to the versions of iMovie (settings and functions may varies among versions), video itself (video format difference because of file extension, resolution, video size and length), compatibility (videos that are completely incompatible with YouTube). In this circumstance, the best and reliable method is to convert your iMovie files to YouTube accepted files, iMovie to YouTube converter will be inevitably the ideal choice. iMovie to YouTube converter is an elaborately designed tool for convert iMovie files to YouTube workable WMV, 3GP, AVI, MOV, MP4, FLV, MKV for smooth uploading with hard-to-believe conversion speed and second to none output quality. It can also convert between almost all popular popular file formats like AVI, WMV, MPG, MOV, VOB, DV, MP4, FLV, 3GP, RM, ASF, SWF, MP3, AAC, AC3, AIFF, AMR, WAV, WMA etc so as to put on various portable devices, import to video editing software or play on vast amount video players. iMovie to YouTube converter can also served as an excellent video editing tool to meet your specific program requirements. For example, you can cut your video files to a certain length, or split your video files to smaller ones and select the proper resolution suitable for demands of YouTube by Clip or Settings separately. Crop allows you to cut off unwanted black edges from your videos. Besides, you can also have a good command of the whole process or snapshot your favourite pictures from the preview window. More can be expected if you have a try.

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• 19" Rackmountable fast storage arrays

  - by Eruditass

  I'm in need of some fast (15+ GB/s write) and somewhat large (50 TB+) storage subsystem with a standard storage interface. I'd prefer something other than Fibre Channel, which admittedly appears to be the most standard interface. RAID 5 is sufficient. What are the cheapest / smallest products from vendors to look at for building this subsystem? I've looked at DDN and TMS so far. Small: Under 20U Cheap: Under a million Edit: I'd really like to cut back costs as much as possible at the expense of capacity. How cheap can these bandwidth requirements be met?

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• Why would the 'show processlist' command speed up normally slow requests to my remote DB? (connected via VPN)

  - by Hakan B.

  I am running a local Django development server that connects to a remote MySQL server via a VPN (IPSec). Request times are awfully slow and I consistently see timeouts. Attempting to diagnose the problem, I logged in to the remote database and ran: show full processlist Immediately, the local server went from idle to working. The page had not yet completely loaded, but progress had been made (debug logs confirm this). When I ran 'show full processlist' several times more in succession, the request completed quickly. I can currently reproduce this - unless I run 'show full processlist' over and over on the remote server, my local request usually times out. Does anyone have any idea why this would happen? I'm running Django 1.3 and OS X 10.7. Note: I realize this may be entirely not be a question with a clear-cut answer and is probably my fault, but it is odd and reproducable, so I hope someone can at least point me the right direction. Thanks in advance.

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• How to fix skipping/stuttering audio in Google Chrome

  - by Droid

  If I play Google Music, or a Youtube video in the Chrome browser, and then open a new tab and start typing the address bar, the audio will quickly cut in and out as I am typing (with almost every letter I type). It also is choppy if I play the video and start typing in the start menu. I can not repeat this behavior using internet explorer. Based on that Im thinking that it maybe a problem with the version of flash Chrome is using but I'm not sure. Any ideas? Im running 32 bit windows 7, i.e. 9, and chrome 23.0 pc is a lenovo t43p. I have the latest sound drivers. i.e. is using flash 11.5.502. chrome is using : Adobe Flash Player - Version: 11.5.31.2 Only one (this) plugin is listed for flash in the chrome plugins list.

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• Is this normal? Multiple httpd process

  - by ilcreatore

  I'm testing a new Server. This isnt really a peak time for my server (2pm), but still its running a bit slow, I was checking the ESTABLISHED connections using the following command: # netstat -ntu | grep :80 | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n http://i.stack.imgur.com/cZuvP.jpg My MaxClients are set to 50. So as you can see on the picture, only 10 people are eating most of my ram. I got a server with 4GB Ram (2.7GB free for apache) but each apache process is eating 53MB each, wich mean im only allowed to accept 50 process. The KeepAlive = Off, but I notice those connections arent closing fast enough, is that normal?

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• Is there a way to allow continuous scrolling in Adobe Reader?

  - by RLH

  I am having to read through a MASSIVE (1000+ page) PDF specification in Adobe Reader X (version 10). It has always bugged me that if you scroll to the edge of a page, the Reader automatically jumps to the top of the next page. Is there away to cut this off so that when I reach the bottom of one page, the edge of the page meets the top of the next page and I can see a half-page of both the last and next page? I know that MS Word can and does behave this way. Can I change a setting to scroll the document in this manner in Adobe Reader?

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• Linux software to maintain old/backup versions of directory tree

  - by Bittrance

  I am replacing an old Linux file server serving NFS and CIFS. For the new server (still serving CIFS and NFS), I would like to have software that automatically and efficiently maintains old revisions of files in parallel trees, so that they can be accessed by users without special tools. I am looking for software that is akin to Time Machine or Flyback, but works well on a server. The dataset is some 10000 files weighing maybe 60 GB. Changes are relatively few, usually less than 100 files changes daily. Using LVM snapshots will not cut it, as the old revisions must reside on a separate set of disks from the live data. Edit: To clarify: keeping old revisions is non-vital addition to the solution, so any suggestion will have to stay in the range of some hundred euros.

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• How to force Chrome to make bookmarks the priority for auto-complete in the address bar?

  - by NoCatharsis

  As it is right now, if I start typing, for instance, "dictionary" into the address bar, Chrome immediately returns a list of bookmarks, history, and related sites. However, the first and highlighted option is to search Google for "dictionary". I want Chrome to immediately recognize that I have a bookmark specifically named "Dictionary" that links to the site www.dictionary.com. But, that's the second choice, not the first. So I have to type a few letters, get auto-complete to suggest some sites, then key down to my bookmark item before pressing Enter. How annoying. Any way to cut the middle man and make my bookmark the top result?

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• Is it possible to have a computer run two OS's in memory at the same time?

  - by Hebon

  I'm sick of needing to reboot my computer every time I wish to use another OS, or run a virtual machine that skimps on power. With the onset of large amounts of memory for computers nowadays I began to think that there must be some way to run two OS's in memory with a way to switch between the two. In my mind, it doesn't seem too difficult; a compatibility layer boots up after bios, which in turn boots to OS1. While in OS1, software is run that triggers a save to ram boots back to the compatability layer, and then boots to OS2. This way, the OS's can be used side by side and boot times are cut drastically short since both OSs are already in ram. Both OS's have their own designated and protected memory so there is no problem there... I mean, it seems fine, but no one has done it, so there must be some reason as to why. I would love some insight into this please.

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• Snippets between desktop and laptop

  - by Jamie F

  The Situation: At work, I have a nice beefy desktop running Windows Server 2008 R2 (SharePoint dev machine). My handy ThinkPad is right next to it. Every once in a while I'd like to cut and paste or share something (usually text) between the machines: for example, I might be headed out and I'd like to take send the URL I'm reading from the desktop to the laptop. Of course I can create a share or use the Admin shares and create files to get stuff back and forth, but that seems heavyweight for what I'm thinking of. I'm thinking more along the lines of sending myself an IM. How do you get little things from machine to machine? Keep a shared folder pinned to the taskbar? Send an email to yourself? Bookmark sync? While on it, I'm looking for a decent multiple clipboard handler: maybe these two functions are combined in some nice little utility? I suspect I'm missing something simple here... Thanks... Jamie F.

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• How to make Excel's "Auto Fit Row Height" feature actually auto fit the row height?

  - by DanM

  For every generation of Excel I can remember (including 2010, which I'm using now), Excel's "Auto Size Row" features sometimes fails to actually auto size a row when the cell contains wrapped text. When it works properly, all the text is revealed and there is no additional space below the last line of text. When it fails, it adds extra space below the text. To make matters worse, what you see is not always what you get, i.e., text that appeared okay on screen gets cut off when it's printed. You also get different sizing depending on whether you are zoomed in/out or at actual size. Simple test case: Why is there a one-line gap after the text in cell A1 but in A2? (I double-checked that I applied Auto Fit Row Height to both rows. Zoom level is 100%.) Is there any known remedy for this without resorting to manually adjusting the row heights (which is not practical for more than a handful of rows)?

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• Can the Gimp split an image into multiple images?

  - by Manu

  I've been scanning a lot of photos recently, more than one at a time. I now have multiple jpegs, each containing multiple photos. Can I, using Gimp, "split" a jpg into 3 smaller files ? What I used to do is : copy the jpg 3 times, and crop a different picture in each copy. There must be an easier way to do this ! EDIT : Is there a plugin that can do that ? I've looked around, but only found plugins that "cut" an image into pieces of equal size.

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