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  • Linux software raid fails to include one device for one RAID1 array

    - by user1389890
    One of my four Linux software raid arrays drops one of its two devices when I reboot my system. The other three arrays work fine. I am running RAID1 on kernel version 2.6.32-5-amd64. Every time I reboot, /dev/md2 comes up with only one device. I can manually add the device by saying $ sudo mdadm /dev/md2 --add /dev/sdc1. This works fine, and mdadm confirms that the device has been re-added as follows: mdadm: re-added /dev/sdc1 After adding the device and and allowing the array time to resynch, this is what the output of $ cat /proc/mdstat looks like: Personalities : [raid1] md3 : active raid1 sda4[0] sdb4[1] 244186840 blocks super 1.2 [2/2] [UU] md2 : active raid1 sdc1[0] sdd1[1] 732574464 blocks [2/2] [UU] md1 : active raid1 sda3[0] sdb3[1] 722804416 blocks [2/2] [UU] md0 : active raid1 sda1[0] sdb1[1] 6835520 blocks [2/2] [UU] unused devices: <none> Then after I reboot, this is what the output of $ cat /proc/mdstat looks like: Personalities : [raid1] md3 : active raid1 sda4[0] sdb4[1] 244186840 blocks super 1.2 [2/2] [UU] md2 : active raid1 sdd1[1] 732574464 blocks [2/1] [_U] md1 : active raid1 sda3[0] sdb3[1] 722804416 blocks [2/2] [UU] md0 : active raid1 sda1[0] sdb1[1] 6835520 blocks [2/2] [UU] unused devices: <none> During reboot, here is the output of $ sudo cat /var/log/syslog | grep mdadm : Jun 22 19:00:08 rook mdadm[1709]: RebuildFinished event detected on md device /dev/md2 Jun 22 19:00:08 rook mdadm[1709]: SpareActive event detected on md device /dev/md2, component device /dev/sdc1 Jun 22 19:00:20 rook kernel: [ 7819.446412] mdadm: sending ioctl 1261 to a partition! Jun 22 19:00:20 rook kernel: [ 7819.446415] mdadm: sending ioctl 1261 to a partition! Jun 22 19:00:20 rook kernel: [ 7819.446782] mdadm: sending ioctl 1261 to a partition! Jun 22 19:00:20 rook kernel: [ 7819.446785] mdadm: sending ioctl 1261 to a partition! Jun 22 19:00:20 rook kernel: [ 7819.515844] mdadm: sending ioctl 1261 to a partition! Jun 22 19:00:20 rook kernel: [ 7819.515847] mdadm: sending ioctl 1261 to a partition! Jun 22 19:00:20 rook kernel: [ 7819.606829] mdadm: sending ioctl 1261 to a partition! Jun 22 19:00:20 rook kernel: [ 7819.606832] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:48 rook kernel: [ 8027.855616] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:48 rook kernel: [ 8027.855620] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:48 rook kernel: [ 8027.855950] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:48 rook kernel: [ 8027.855952] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:49 rook kernel: [ 8027.962169] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:49 rook kernel: [ 8027.962171] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:49 rook kernel: [ 8028.054365] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:49 rook kernel: [ 8028.054368] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.588662] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.588664] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.601990] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.601991] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.602693] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.602695] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.605981] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.605983] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.606138] mdadm: sending ioctl 800c0910 to a partition! Jun 22 19:10:23 rook kernel: [ 9.606139] mdadm: sending ioctl 800c0910 to a partition! Jun 22 19:10:48 rook mdadm[1737]: DegradedArray event detected on md device /dev/md2 Here is the mdadm.conf file: ARRAY /dev/md0 metadata=0.90 UUID=92121d42:37f46b82:926983e9:7d8aad9b ARRAY /dev/md1 metadata=0.90 UUID=9c1bafc3:1762d51d:c1ae3c29:66348110 ARRAY /dev/md2 metadata=0.90 UUID=98cea6ca:25b5f305:49e8ec88:e84bc7f0 ARRAY /dev/md3 metadata=1.2 name=rook:3 UUID=ca3fce37:95d49a09:badd0ddc:b63a4792 I also ran $ sudo smartctl -t long /dev/sdc and no hardware issues were detected. As long as I do not reboot, /dev/md2 seems to work fine. Does anyone have any suggestions? Here is the output of $ sudo mdadm -E /dev/sdc1 after re-adding the device and letting it resync: /dev/sdc1: Magic : a92b4efc Version : 0.90.00 UUID : 98cea6ca:25b5f305:49e8ec88:e84bc7f0 (local to host rook) Creation Time : Sun Jul 13 08:05:55 2008 Raid Level : raid1 Used Dev Size : 732574464 (698.64 GiB 750.16 GB) Array Size : 732574464 (698.64 GiB 750.16 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 2 Update Time : Mon Jun 24 07:42:49 2013 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Checksum : 5fd6cc13 - correct Events : 180998 Number Major Minor RaidDevice State this 0 8 33 0 active sync /dev/sdc1 0 0 8 33 0 active sync /dev/sdc1 1 1 8 49 1 active sync /dev/sdd1 Here is the output of $ sudo mdadm -D /dev/md2 after re-adding the device and letting it resync: /dev/md2: Version : 0.90 Creation Time : Sun Jul 13 08:05:55 2008 Raid Level : raid1 Array Size : 732574464 (698.64 GiB 750.16 GB) Used Dev Size : 732574464 (698.64 GiB 750.16 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 2 Persistence : Superblock is persistent Update Time : Mon Jun 24 07:42:49 2013 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 UUID : 98cea6ca:25b5f305:49e8ec88:e84bc7f0 (local to host rook) Events : 0.180998 Number Major Minor RaidDevice State 0 8 33 0 active sync /dev/sdc1 1 8 49 1 active sync /dev/sdd1

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  • Upon reboot, Linux software raid fails to include one device of a RAID1 array

    - by user1389890
    One of my four Linux software raid arrays drops one of its two devices when I reboot my system. The other three arrays work fine. I am running RAID1 on kernel version 2.6.32-5-amd64 (Debian Squeeze). Every time I reboot, /dev/md2 comes up with only one device. I can manually add the device by saying $ sudo mdadm /dev/md2 --add /dev/sdc1. This works fine, and mdadm confirms that the device has been re-added as follows: mdadm: re-added /dev/sdc1 After adding the device and allowing the array time to resynch, this is what the output of $ cat /proc/mdstat looks like: Personalities : [raid1] md3 : active raid1 sda4[0] sdb4[1] 244186840 blocks super 1.2 [2/2] [UU] md2 : active raid1 sdc1[0] sdd1[1] 732574464 blocks [2/2] [UU] md1 : active raid1 sda3[0] sdb3[1] 722804416 blocks [2/2] [UU] md0 : active raid1 sda1[0] sdb1[1] 6835520 blocks [2/2] [UU] unused devices: <none> Then after I reboot, this is what the output of $ cat /proc/mdstat looks like: Personalities : [raid1] md3 : active raid1 sda4[0] sdb4[1] 244186840 blocks super 1.2 [2/2] [UU] md2 : active raid1 sdd1[1] 732574464 blocks [2/1] [_U] md1 : active raid1 sda3[0] sdb3[1] 722804416 blocks [2/2] [UU] md0 : active raid1 sda1[0] sdb1[1] 6835520 blocks [2/2] [UU] unused devices: <none> During reboot, here is the output of $ sudo cat /var/log/syslog | grep mdadm : Jun 22 19:00:08 rook mdadm[1709]: RebuildFinished event detected on md device /dev/md2 Jun 22 19:00:08 rook mdadm[1709]: SpareActive event detected on md device /dev/md2, component device /dev/sdc1 Jun 22 19:00:20 rook kernel: [ 7819.446412] mdadm: sending ioctl 1261 to a partition! Jun 22 19:00:20 rook kernel: [ 7819.446415] mdadm: sending ioctl 1261 to a partition! Jun 22 19:00:20 rook kernel: [ 7819.446782] mdadm: sending ioctl 1261 to a partition! Jun 22 19:00:20 rook kernel: [ 7819.446785] mdadm: sending ioctl 1261 to a partition! Jun 22 19:00:20 rook kernel: [ 7819.515844] mdadm: sending ioctl 1261 to a partition! Jun 22 19:00:20 rook kernel: [ 7819.515847] mdadm: sending ioctl 1261 to a partition! Jun 22 19:00:20 rook kernel: [ 7819.606829] mdadm: sending ioctl 1261 to a partition! Jun 22 19:00:20 rook kernel: [ 7819.606832] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:48 rook kernel: [ 8027.855616] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:48 rook kernel: [ 8027.855620] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:48 rook kernel: [ 8027.855950] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:48 rook kernel: [ 8027.855952] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:49 rook kernel: [ 8027.962169] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:49 rook kernel: [ 8027.962171] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:49 rook kernel: [ 8028.054365] mdadm: sending ioctl 1261 to a partition! Jun 22 19:03:49 rook kernel: [ 8028.054368] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.588662] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.588664] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.601990] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.601991] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.602693] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.602695] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.605981] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.605983] mdadm: sending ioctl 1261 to a partition! Jun 22 19:10:23 rook kernel: [ 9.606138] mdadm: sending ioctl 800c0910 to a partition! Jun 22 19:10:23 rook kernel: [ 9.606139] mdadm: sending ioctl 800c0910 to a partition! Jun 22 19:10:48 rook mdadm[1737]: DegradedArray event detected on md device /dev/md2 Here is the result of $ cat /etc/mdadm/mdadm.conf: ARRAY /dev/md0 metadata=0.90 UUID=92121d42:37f46b82:926983e9:7d8aad9b ARRAY /dev/md1 metadata=0.90 UUID=9c1bafc3:1762d51d:c1ae3c29:66348110 ARRAY /dev/md2 metadata=0.90 UUID=98cea6ca:25b5f305:49e8ec88:e84bc7f0 ARRAY /dev/md3 metadata=1.2 name=rook:3 UUID=ca3fce37:95d49a09:badd0ddc:b63a4792 Here is the output of $ sudo mdadm -E /dev/sdc1 after re-adding the device and letting it resync: /dev/sdc1: Magic : a92b4efc Version : 0.90.00 UUID : 98cea6ca:25b5f305:49e8ec88:e84bc7f0 (local to host rook) Creation Time : Sun Jul 13 08:05:55 2008 Raid Level : raid1 Used Dev Size : 732574464 (698.64 GiB 750.16 GB) Array Size : 732574464 (698.64 GiB 750.16 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 2 Update Time : Mon Jun 24 07:42:49 2013 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Checksum : 5fd6cc13 - correct Events : 180998 Number Major Minor RaidDevice State this 0 8 33 0 active sync /dev/sdc1 0 0 8 33 0 active sync /dev/sdc1 1 1 8 49 1 active sync /dev/sdd1 Here is the output of $ sudo mdadm -D /dev/md2 after re-adding the device and letting it resync: /dev/md2: Version : 0.90 Creation Time : Sun Jul 13 08:05:55 2008 Raid Level : raid1 Array Size : 732574464 (698.64 GiB 750.16 GB) Used Dev Size : 732574464 (698.64 GiB 750.16 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 2 Persistence : Superblock is persistent Update Time : Mon Jun 24 07:42:49 2013 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 UUID : 98cea6ca:25b5f305:49e8ec88:e84bc7f0 (local to host rook) Events : 0.180998 Number Major Minor RaidDevice State 0 8 33 0 active sync /dev/sdc1 1 8 49 1 active sync /dev/sdd1 I also ran $ sudo smartctl -t long /dev/sdc and no hardware issues were detected. As long as I do not reboot, /dev/md2 seems to work fine. Does anyone have any suggestions?

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  • declaring a 2D array of pointer objects

    - by Tyler Stennette
    I'm having a tough time figuring out how to instantiate a 2D array of pointer objects. Here is how I'm doing it: Pieces* chessBoard[9][9]; When I want to set it to an actual object pointer, I'm doing the following: chessBoard[1][1] = new Rook(p1Rook); Rook is a class that inherits attributes from the Pieces class and p1Rook is a char variable set to 'R'. This class also implements virtual functions (not pure virtual) from Pieces such as move() or getPiece() that are unique to the particular chess piece. However, when I compile my program, I get the following error: ChessBoard.cpp:69: error: expected type-specifier before ‘Rook’ ChessBoard.cpp:69: error: cannot convert ‘int*’ to ‘Pieces*’ in assignment Can someone please explain what I should change to get rid of this rather annoying persistent error? I would appreciate it.

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  • Opinion on LastPass's security for the Average Joe [closed]

    - by Rook
    This is borderline on objective/subjective, but I'm posting it here since I'm more interested in objective facts, without going into too much technical details, than I am in user reviews of LastPass. I've always used offline ways for (password / sensitive data) storage, but lately I keep hearing good things about LastPass. Indeed, it is more practical having it always accessible from every computer you're using without syncing and related problems, but the security aspect still troubles me. How (in a nutshell for dummies) does LastPass keep your data secure / can their employees see your data, and what is your opinion for such storage of more than usual keeping of sensitive data (bank PIN codes, some financial / business related stuff and so on - you know, the things that would practically hurt if lost / phished)? What are your opinions of it, and do you trust it for such? Any bad experiences? If someone for example is sniffing your wifi network, would such data be easier than usual to sniff out?

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  • What are the drawbacks of Python?

    - by Rook
    Python seems all the rage these days, and not undeservingly - for it is truly a language with which one almost enjoys being given a new problem to solve. But, as a wise man once said (calling him a wise man only because I've no idea as to who actually said it; not sure whether he was that wise at all), to really know a language one does not only know its syntax, design, etc., advantages but also its drawbacks. No language is perfect, some are just better than others. So, what would be in your opinion, objective drawbacks of Python. Note: I'm not asking for a language comparison here (i.e. C# is better than Python because ... yadda yadda yadda) - more of an objective (to some level) opinion which language features are badly designed, whether, what are maybe some you're missing in it and so on. If must use another language as a comparison, but only to illustrate a point which would be hard to elaborate on otherwise (i.e. for ease of understanding)

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  • Where to find Hg/Git technical support?

    - by Rook
    Posting this as a kind of a favour for a former coleague, so I don't know the exact circumstances, but I'll try to provide as much info as I can ... A friend from my old place of employment (maritime research institute; half government/commercial funding) has asked me if I could find out who provides technical support (commercial) for two major DVCS's of today - Git and Mercurial. They have been using VCS for years now (Subversion while I was there, don't know what they're using now - probably the same), and now they're renewing their software licences (they have to give a plan some time in advance for everything ... then it goes "through the system") and although they will be keeping Subversion as well, they would like to justify beginning of DVCS as an alternative system (most people root for Mercurial since it seems simpler; mostly engineers and physicians there who are not that interested in checking Git repos for corruption and the finer workings of Git, but I believe any one of the two could "pass") - but it has to have a price (can be zero; no problem there) and some sort of official technical support. It is a pro forma matter, but it has to be specified. Most of the people there are using one of the two already, but this has to be specified to be official. So, I'm asking you - do you know where could one go for Git or Mercurial technical support (can be commercial)? Technical forums and the like are out of the question. It has to work on the principle: - I have a problem. - I post a question with the details. - I get an answer in specified time. It can be "we cannot do that." but it has to be an official answer and given in agreed time. I'm sure by now most of you understand what I'm asking, but if not - post a comment or similar. Also, if you think of any reasons which could decide justification of introducing Git/Hg from an technical and administrative viewpoint, feel free to write them down also.

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  • Google analytics and Adwords showing very different figures

    - by Dave Rook
    In AdWords I have 1 advert running only. The landing page includes a querystring so I can track it. EG, www.mydomain.com/products?source=CPC I also use Google Analytics. For February I have approx 1450 clicks in AdWords. This means, 1450 went to my website. In Google Analytics, according to my landing page, there were only ~850 visits. In Google Analytics, in the Acquisition - All traffic page, it suggests that Google CPC brought 517 visits... I know tracking tools are not 100% reliable but this figure seems to be showing something is very wrong. How can I tell which of the figures is accurate or is this just a limitation of reporting tools?

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  • How do I verify the ownership of a domain from Namecheap to use Google Apps?

    - by Rook
    I registered a domain with Namecheap.com, and started the Google Apps registration process. After the initial data filling, google apps wishes me to prove the ownership of a domain, and has given me 4 choices: Add a DNS record to your domain's configuration Link to your Google Analytics account Upload an HTML file to your server Add a meta tag to your site's home page What is the differences between these, and how do I (if someone knows perhaps how to do it on Namecheap, it would be even better) complete this step in the process? I would appreciate any advice you might have.

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  • Do delegates defy OOP

    - by Dave Rook
    I'm trying to understand OOP so I can write better OOP code and one thing which keeps coming up is this concept of a delegate (using .NET). I could have an object, which is totally self contained (encapsulated); it knows nothing of the outside world... but then I attach a delegate to it. In my head, this is still quite well separated as the delegate only knows what to reference, but this by itself means it has to know about something else outside it's world! That a method exists within another class! Have I got myself it total muddle here, or is this a grey area, or is this actually down to interpretation (and if so, sorry as that will be off topic I'm sure). My question is, do delegates defy/muddy the OOP pattern?

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  • What language has the best/most library bindings?

    - by Rook
    A library binding allows a programming language to use a library written in another language. Most commonly you want to access a C library like libcurl from a language like PHP or Python. Not all bindings are created equally, for instance the libcurl binding for Python was abandoned almost 3 years ago and their sf.net bug tracker is overrun with unsolved problems. PHP on the other hand has very good libcurl bindings that are actively maintained. So here is my question: What language has the best and/or the most bindings?

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  • Repairing yum's repositories on a RHEL5.

    - by The Rook
    I am using RHEL5 and yum is missing many packages, such as apache, php, and all php libraries . I have added the rpmforge repository, but i am still missing these packages. This is an i686 machine and there might not be many i686 packages available, I think that if i force an i386 i'll have serious problems. How do I make sure I have a large number of compatible packages on a RHEL5 system? I didn't install this system, is it normal for RHEL5 to have virtually no useful packages in yum? How do RHEL5 administrators use yum without introducing conflicts with currently installed packages? Should I ditch yum and use apt? Thanks!

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  • Hosting DokuWiki on a Stick

    - by Rook
    I have a rather middlish DokuWiki on a stick project documentation which I've always used offline, since I was the only author which did documentation. Now the mentioned project is somewhat expanding, and I need a way and a place to host it somewhere. Can anyone recommend where such a place might be found? (few several beginner questions will follow now) Also, (at this point I might mention that I chose DokuWiki because of it "just works" attitude and because I didn't want to learn server adminstration and the like ...) I'm interested, how much are Wiki systems "compatible"? What I mean under compatible? As far as I understood DokuWiki saves data as text files. If I were to wish to convert it to some other Wiki system would it be possible? Or some other format more suitable for printing (at some point it will be necessary to convert a lot of documentation to a manual format for users). All advices and constructive approaches to this appreciated.

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  • SFTP File Restrictions.

    - by The Rook
    Is it possible to use SFTP on Linux and restrict a user account to ONE directory such that no other directory listing can be obtained? Yes, I must use SFTP, FTP is only used by people that love getting hacked. For instance I want someone to modify files in /var/www/code/ but I don't want them to be able modify anything else. I don't even want them to see the contents /tmp/. (I will accept a "quick and dirty" solution, as long as it is secure.)

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  • Remove identifying information from SSH.

    - by The Rook
    When I do an nmap -sV 127.0.0.1 -p 22 of my system I get the following information: SF-Port22-TCP:V=4.62%I=7%D=11/9%Time=4916402C%P=i686-pc-linux-gnu%r(NULL,2 SF:7,"SSH-2.0-OpenSSH_5.1p1\x20Debian-3ubuntu1\r\n"); How do I go about chaining these two pieces of information? i686-pc-linux-gnu and SSH-2\.0-OpenSSH_5\.1p1\x20Debian-3ubuntu1.

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  • Apache is running the wrong version of PHP.

    - by The Rook
    I am trying to enable CURL in php, and possibly update php as well. I have run into a road block where Apache seems to be running the wrong version of PHP. Here is some evidence. #lsof | grep php httpd 18397 nobody 135w REG 8,3 242 528537 /usr/local/apache/modules/libphp5.so I download the latest php 5.2.13 and build from source. I run a service httpd stop, do a make install and then I manually overwrite /usr/local/apache/modules/libphp5.so just to be safe. Using ldd i can see that its my fresh binary compiled with curl (the old one doesn't have curl.) ldd /usr/local/apache/modules/libphp5.so | grep curl libcurl.so.4 => /usr/local/lib/libcurl.so.4 (0x0064e000) I execute a phpinfo() and 5.2.3 is being executed instated of my new 5.2.13 and "curl" is nowhere to be found. What am I doing wrong? Why is curl disabled even though its statically linked? This is a RHEL 5.5 system.

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  • How to open the Select Users, Computers, Service Accounts or Groups

    - by Dave Rook
    The only way I know how to open the Select Users, Computers, Service Accounts or Groups is by right clicking on a folder and selecting Properties - Security Tab - Edit - Advanced. Below is a screen shot of the window I want to access: Is there any other way to view the full list (Find Now)? I am writing documentation and I want the user to check if a user exists before creating it. I would ideally like them to access this via control panel or similar.

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  • RHEL5 php5-curl install fail.

    - by The Rook
    PHP's curl bindings are nowhere to be found in yum. By looking in the yum.repos.d I can see that rpmforge is being used. Build from source? phpize isn't installed and it isn't in yum. What do i do? How do i repair the repo? This is RHEL5 machine that is i686.

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  • Excel trendline accuracy

    - by Rook
    This is a problem I have every once in a while, and it annoys me tremendously, beacuse I have always to recheck every trendline I get. An example: r L (mm) 30,00 97,0 60,00 103,2 90,00 106,0 110,00 101,0 125,00 88,0 140,00 62,0 148,00 36,7 152,50 17,0 Upon drawing a trendline (using 3rd order polynomial regression type) with r on the x axis, and L on the y one, Excel will give the formula y = -0,0002x³ + 0,0341x² - 1,8979x + 128,73 with R² = 0,994. If I interpolate values using that formula for the same values of r as the ones the formula was derived from, I get r y (mm) 30,00 97,083 60,00 94,416 90,00 88,329 110,00 66,371 125,00 33,68 140,00 -17,416 148,00 -53,5912 152,50 -76,97725 which are quite different? Why does this happen? What is the reason for it?

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  • Outlook - responding with a pre-defined message

    - by Dave Rook
    I am trying to be able to reply to an email with a pre-defined message. Every day, I get asked to do the same tasks and I have to reply to each with exactly the same email, similar to: Hi, I received your email, I have now started the task for you. Regards, Dave Tutorials I have found using the email template is more about starting a new email as opposed to replying (as it doesn't appear to keep the thread). In my ideal world, I would like to click reply and insert a pre-written message. The only way I've worked out how to do this is to 'cheat' some what and use the signature as the entire email response (and actually does the job very well other than leaving a space above my reply) I have found similar questions on Super User and other websites but have had no luck, nor have I from my own Google searches. Does any one have any other solutions? Solved This is now solved - in 2 days from this post I can mark it as answer.

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  • Copying between 2 network devices

    - by Dave Rook
    My network has 3 devices - 1 PC and 2 other network devices (which could be PC, NAS, external hard drive etc) If I want to copy data from one network device to another network device from my PC (using the copy and paste method (i.e right click a file, select copy and then right click into the destination folder and click paste) and therefore not using any tools that could be built into the network devices for such a transaction), does the data get routed via my PC or use my systems resources?

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  • Getting gvim to show unicode

    - by Rook
    How to get GVim (v. 7.3. on Windows XP, if that matters) to show Unicode characters? Something along the lines of http://vimcasts.org/episodes/show-invisibles/ (search for listchars to see the little triangle I'm trying to get). I'm using set encoding, set fileencoding, and set fileencodings, all to utf-8, if that helps. I know it must be something simple, but nevertheless, here I am, stuck. Help.

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  • How can I get the following compiled on UVA?

    - by Michael Tsang
    Note the comment below. It cannot compiled on UVA because of a bug in GCC. #include <cstdio> #include <cstring> #include <cctype> #include <map> #include <stdexcept> class Board { public: bool read(FILE *); enum Colour {none, white, black}; Colour check() const; private: struct Index { size_t x; size_t y; Index &operator+=(const Index &) throw(std::range_error); Index operator+(const Index &) const throw(std::range_error); }; const static std::size_t size = 8; char data[size][size]; // Cannot be compiled on GCC 4.1.2 due to GCC bug 29993 // http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29993 typedef bool CheckFunction(Colour, const Index &) const; CheckFunction pawn, knight, bishop, king, rook; bool queen(const Colour c, const Index &location) const { return rook(c, location) || bishop(c, location); } static char get_king(Colour c) { return c == white ? 'k' : 'K'; } template<std::size_t n> bool check_consecutive(Colour c, const Index &location, const Index (&offsets)[n]) const { for(const Index *p = offsets; p != (&offsets)[1]; ++p) { try { Index target = location + *p; for(; data[target.x][target.y] == '.'; target += *p) { } if(data[target.x][target.y] == get_king(c)) return true; } catch(std::range_error &) { } } return false; } template<std::size_t n> bool check_distinct(Colour c, const Index &location, const Index (&offsets)[n]) const { for(const Index *p = offsets; p != (&offsets)[1]; ++p) { try { Index target = location + *p; if(data[target.x][target.y] == get_king(c)) return true; } catch(std::range_error &) { } } return false; } }; int main() { Board board; for(int d = 1; board.read(stdin); ++d) { Board::Colour c = board.check(); const char *sp; switch(c) { case Board::black: sp = "white"; break; case Board::white: sp = "black"; break; case Board::none: sp = "no"; break; } std::printf("Game #%d: %s king is in check.\n", d, sp); std::getchar(); // discard empty line } } bool Board::read(FILE *f) { static const char empty[] = "........" "........" "........" "........" "........" "........" "........" "........"; // 64 dots for(char (*p)[size] = data; p != (&data)[1]; ++p) { std::fread(*p, size, 1, f); std::fgetc(f); // discard new-line } return std::memcmp(empty, data, sizeof data); } Board::Colour Board::check() const { std::map<char, CheckFunction Board::*> fp; fp['P'] = &Board::pawn; fp['N'] = &Board::knight; fp['B'] = &Board::bishop; fp['Q'] = &Board::queen; fp['K'] = &Board::king; fp['R'] = &Board::rook; for(std::size_t i = 0; i != size; ++i) { for(std::size_t j = 0; j != size; ++j) { CheckFunction Board::* p = fp[std::toupper(data[i][j])]; if(p) { Colour ret; if(std::isupper(data[i][j])) ret = white; else ret = black; if((this->*p)(ret, (Index){i, j}/* C99 extension */)) return ret; } } } return none; } bool Board::pawn(const Colour c, const Index &location) const { const std::ptrdiff_t sh = c == white ? -1 : 1; const Index offsets[] = { {sh, 1}, {sh, -1} }; return check_distinct(c, location, offsets); } bool Board::knight(const Colour c, const Index &location) const { static const Index offsets[] = { {1, 2}, {2, 1}, {2, -1}, {1, -2}, {-1, -2}, {-2, -1}, {-2, 1}, {-1, 2} }; return check_distinct(c, location, offsets); } bool Board::bishop(const Colour c, const Index &location) const { static const Index offsets[] = { {1, 1}, {1, -1}, {-1, -1}, {-1, 1} }; return check_consecutive(c, location, offsets); } bool Board::rook(const Colour c, const Index &location) const { static const Index offsets[] = { {1, 0}, {0, -1}, {0, 1}, {-1, 0} }; return check_consecutive(c, location, offsets); } bool Board::king(const Colour c, const Index &location) const { static const Index offsets[] = { {-1, -1}, {-1, 0}, {-1, 1}, {0, 1}, {1, 1}, {1, 0}, {1, -1}, {0, -1} }; return check_distinct(c, location, offsets); } Board::Index &Board::Index::operator+=(const Index &rhs) throw(std::range_error) { if(x + rhs.x >= size || y + rhs.y >= size) throw std::range_error("result is larger than size"); x += rhs.x; y += rhs.y; return *this; } Board::Index Board::Index::operator+(const Index &rhs) const throw(std::range_error) { Index ret = *this; return ret += rhs; }

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  • How to change VS2010 Add Reference box filter ?

    - by rook
    I'm getting used to the new IDE (it's vc# express), but the first contact is somewhat confusing. When I open the Add Reference dialog and switch to the .NET tab, a label above the assembly list states: "Filtered to:.NET Framework 4". And it's true - I can reference .NET 4.0 assemblies only plus things like XNA 3.1. However I can't see older assemblies i.e. Managed DirectX libs, which are obviously installed on my computer as there was no trouble with adding a ref to them in vc#08. What is this? How to change the filter? The label is read-only. These sound like dull guy's questions, but I'm out of lack of finding an answer and there is no intuitive solution. Thanks in advance.

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  • Reflecting derived classes in C#

    - by rook
    Let's assume there's a class with a virtual property (let's call it 'P'). It's overridden in a deriving class. Now I want to use something like this: obj.GetType().GetProperty("P") to get info about the overriding property. This search is ambigous, because there are two "P" properties (base and override). So I typed: obj.GetType().GetProperty("P", BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.Instance) It returns the overriding "P" only, but what if I can't guess in compile time if there's an override at all? The latter call would return null. The case is even more complicated, if the hierarchy of inheritance is bigger. In other words, I want to get the 'top-most' override available, otherwise - the base property. What is the cleanest way to achieve the aim? Only one I know at the moment is to go through all properties and check name and declaring type.

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