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  • Trust metrics and related algorithms

    - by Nick Gerakines
    I'm trying to learn more about trust metrics (including related algorithms) and how user voting, ranking and rating systems can be wired to stiffle abuse. I've read abstract articles and papers describing trust metrics but haven't seen any actual implementations. My goal is to create a system that allows users to vote on other users and the content of other users and with those votes and related meta-data, determine if those votes can be applied to a users level or popularity. Have you used or seen some sort of trust system within a social graph? How did it work and what were its areas of strength and weaknesses?

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  • Neo4j+Gremlin : Trouble with T.gte and floating point node attributes

    - by letronje
    For a type of nodes in my graph, attribute values for an attribute(named 'some_count') is either missing or an integer or a float. I'm trying to write gremlin to filter these nodes based on minimum value for this attribute. I first verified that the values are indeed present by firing the following gremlin g.v(XXX)._().in('category').hasNot('some_count', T.eq, null).back(1).some_count Next, I tried filtering by exact value and that works and show me the matching nodes or gives an empty array if there is no match g.v(XXX)._().in('category').hasNot('some_count', T.eq, null).back(1).has('some_count', T.eq, 120000.0d) But the following query that uses the 'greater than or equal to' comparator doesn't work. g.v(XXX)._().in('category').hasNot('some_count', T.eq, null).back(1).has('some_count', T.gte, 1.0d) this returns nil (I'm querying via ruby/rails using Neo4j AR Adapter ) Instead of returning an empty array for no match, it returns a nil, which tells me something could be wrong with the query itself. I'm running neo4j community server 1.8. Is there a way I can ask Neo4j to log errors/queries, to see what could be going wrong ?

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  • Post wall message on facebook account

    - by Zeroshade
    Hello, I am trying to implement some functionality in a blackberry app, that I saw in other application. Basically it's a window that has a message, and a Facebook icon. When you click on the icon it launches a new window, this window asks the user for permissions(user and password), and then the message is posted in the user's wall. So my question is how can I replicate that?. I have been looking at the graph api, but I just can't figure out how to do all of this in one step. I mean just typing the url in the browser, and some post data. Thanks a lot.

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  • Who owes who money optimisation problem

    - by Francis
    Say you have n people, each who owe each other money. In general it should be possible to reduce the amount of transactions that need to take place. i.e. if X owes Y £4 and Y owes X £8, then Y only needs to pay X £4 (1 transaction instead of 2). This becomes harder when X owes Y, but Y owes Z who owes X as well. I can see that you can easily calculate one particular cycle. It helps for me when I think of it as a fully connected graph, with the nodes being the amount each person owes. Problem seems to be NP-complete, but what kind of optimisation algorithm could I make, nevertheless, to reduce the total amount of transactions? Doesn't have to be that efficient, as N is quite small for me.

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  • iPhone - Open excel from SSRS 2008

    - by milesmcgehee
    We're currently having a problem with our 2008 SSRS server sending excel reports to users with iPhones. They get the email with no problems, but when the XLS file is opened on the phone, it returns an error of: Invalid format. Everyone else can open the report with no problems (email/blackberry) The odd thing, is I can drag the file to my desktop from the message, open it, save it, and then email it again and it opens just fine on the phone. Does anyone know of hotfix that can be applied to the SSRS server to create the XLS files correctly? Or something I can change to make this work? I know we can send all the attachments in PDF but I'd like to keep them XLS if at all possible.

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  • Microsoft Office documents collaboration - Open Source alternative

    - by Saggi Malachi
    I am looking for a good solution to collaborate on Microsoft Office documents, we currently just edit directly on a Samba share but it's one big mess because sometimes people leave the office with their laptops while docs are open so swap files remain there and then you nobody is sure what's going on. Is there any good and simple open source solution based on Linux? I've tried Alfresco but it is much more than what I need, we got an internal wiki for most collaboration and I just need some solution for the stuff we need to do in Microsoft Office (mostly Excel files, the rest is in the wiki) EDIT: Some more info as requested - we are very small group, 4 full time employees and a few freelancers. The best idea I've got so far is just managing it in a subversion repository with a Lock-Modify-Lock policy but I'd love to hear about better solutions. Thanks!

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  • Adobe Illustrator can't open SVG file

    - by themapguyde
    I have a generated SVG file which for some reason won't open in Adobe Illustrator when I serve the file content from my ASP.net application, but if I were to write this generated file directly to the file system from my ASP.net application, the file opens fine! I've put a zip of the two files here: http://dl.dropbox.com/u/1761973/Files.zip The zip has two files: Map.svg Test.svg Map.svg doesn't open in Illustrator, it shows up a Text Import Options dialog, and upon clicking OK, will show the XML content of the file. Test.svg opens fine in Illustrator. Doing a comparison of the two files yields NO DIFFERENCES whatsoever! There must be something different in these two files (caused by downloading the generated SVG from the web browser), but I have no idea what?

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  • Natively open .doc or .odt file in LaTex

    - by MaQleod
    I have looked at ways to convert word or open office text files to LaTex format, and those have been addressed on SU here and here. These will work, but I'd rather have a native single-step solution. Does anyone know of any module or add-on for LaTex that will let one open .doc and/or .odt files without the use of third-party conversion tools? It would be ideal if it would allow for editing and saving in the same format. If it makes any difference, I am using LaTex Editor in Windows.

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  • can I bundle multiple installs for Mac OSX and do them as a single script?

    - by Dov
    I have a lot of open source software to be installed for a course. We currently run on PCs that we provide. If we allow students to use their own Macs in Mac-centric schools, that means we have to load the software on those Macs. Rathern than have to load individual software, is there any way I can create a single file, mount it and run a script to install all packages? We are willing to simplify the installs by standardizing the locations to store the applications, since the students will have identical machines.

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  • Unable to run openoffice in headless mode

    - by uswaretech
    I want to automoate some PPT - PDF conversions, so I want to run openoffice in headless mode for scripting. On my machine with X running I can start opemoffice in headless mode via soffice -accept="socket,port=8100;urp;" -headless This doesn't seem to work on a server with X not running. $ soffice -accept="socket,port=8100;urp;" -headless /usr/lib/openoffice/program/soffice.bin X11 error: Can't open display: Set DISPLAY environment variable, use -display option or check permissions of your X-Server (See "man X" resp. "man xhost" for details) $ The error doesnt seem to make sense as well, as the point of specifying -headless was so that I do not need X, while this command seems to look for X.

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  • setting ulimit and ubuntu 8.04

    - by Wizzard
    Hi there, We have two ubuntu 8.04 servers. With the database server I set the table_cache to 1000 however when I restart mysql the status only shows 257 and the open files limit says 1024 I adjusted ulimit by doing ulimit -n 8192 and then restarting mysql; this seemed to do the tick however after a few hours I did ulimit -n and saw it had returned back to 1024 Bit of a worry. I edited the /etc/security/limits.conf and added mysql soft nofile 8192 mysql hard nofile 8192 then rebooted, no change. I then edited and change mysql to * rebooted, no change I then edited and changed it to one line * - nofile 8192 and rebooted, no change. cat /proc/sys/fs/file-max gives me 768730 sysctl fs.file-max gives me fs.file-max = 768730 I am at a bit of a loss to how I can set and keep the ulimit value set so I can increase the table cache properly on mysql.

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  • VNC over SSH on open Tunnel

    - by Joey Bagodonuts
    Is it possible to bind VNC server to a open SSH tunnel? I have a tablet that has initiated a reverse ssh tunnel to my server. This works fine over port 8080. I need to now bind to this port from my local machine. It looks like Ubuntu has some "remote desktop viewier" that has ssh built in capabilities so I assume the only thing I need to do now is figure out how to bind the tablets VNCserver to the open SSH tunnel. Is this possible? Thanks

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  • tar fails to open .tar file on OS X

    - by denonth
    I need to unarchive a file to the /Developer folder. My file is in /Users/User/Desktop/VMware/Downloads And I am trying tar -xf qt-everywhere-ios-4.8.0-arm7-nossl.tar.gz -C /Developer and keep getting: Lions-Mac:Downloads User$ tar -xf qt-everywhere-ios-4.8.0-arm7-nossl.tar -C /Developer tar: Error opening archive: Failed to open 'qt-everywhere-ios-4.8.0-arm7-nossl.tar' How can I achieve this? Install Qt for iOS SDK The Qt for iOS SDK has been configured to be installed in the default Xcode installation location /Developer. It is not possible to install the SDK into another location without first rebuilding it, as the install location is contained within the qmake executable, and that is built as part of Qt. To install the Qt for iOS SDK, open ‘Terminal’ and type the following from the command­-line: tar –xf qt­-everywhere-­ios­-4.8.0­-xxx.tar.gz –C /Developer (where xxx is an identifier which can be used to determine the build of the iOS SDK eg. arm7-­-nossl) This will install the Qt for iOS SDK into the following path: /Developer/Platforms/iPhoneOS.platform/Developer/usr/share/qt­-everywhere­-ios­-4.8.0

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  • MySQL open files limit

    - by Brian
    This question is similar to set open_files_limit, but there was no good answer. I need to increase my table_open_cache, but first I need to increase the open_files_limit. I set the option in /etc/mysql/my.cnf: open-files-limit = 8192 This worked fine in my previous install (Ubuntu 8.04), but now in Ubuntu 10.04, when I start the server up, open_files_limit is reported to be 1710. That seems like a pretty random number for the limit to be clipped to. Anyway, I tried getting around it by adding a line like this in /etc/security/limits.conf: mysql hard nofile 8192 I also tried adding this to the pre-start script in mysql's upstart config (/etc/init/mysql.conf): ulimit -n 8192 Obviously neither of those things worked. So where is the hoop that has been added between Ubuntu 8.04 and 10.04 through which I must jump in order to actually increase the open files limit?

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  • xf86OpenConsole: Cannot open /dev/tty0 (No such file or directory)

    - by mazgalici
    root@mazgalici:~# startx X.Org X Server 1.7.6 Release Date: 2010-03-17 X Protocol Version 11, Revision 0 Build Operating System: Linux 2.6.24-28-server i686 Ubuntu Current Operating System: Linux mazgalici 2.6.18-194.26.1.el5.028stab079.2PAE #1 SMP Fri Dec 17 19:34:22 MSK 2010 i686 Kernel command line: quiet Build Date: 10 November 2010 11:25:26AM xorg-server 2:1.7.6-2ubuntu7.4 (For technical support please see ) Current version of pixman: 0.16.4 Before reporting problems, check to make sure that you have the latest version. Markers: (--) probed, (**) from config file, (==) default setting, (++) from command line, (!!) notice, (II) informational, (WW) warning, (EE) error, (NI) not implemented, (??) unknown. (==) Log file: "/var/log/Xorg.0.log", Time: Tue Jan 11 01:28:48 2011 (==) Using config directory: "/usr/lib/X11/xorg.conf.d" Fatal server error: xf86OpenConsole: Cannot open /dev/tty0 (No such file or directory) Please consult the The X.Org Foundation support at http://wiki.x.org for help. Please also check the log file at "/var/log/Xorg.0.log" for additional information. ddxSigGiveUp: Closing log

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  • TrueCrypt: Open volume without mounting

    - by Totomobile
    I have a corrupt TrueCrypt volume. When I try to mount it, the password is fine but I get an error: hdiutil attach failed no mountable file systems. I just need to open it without TrueCrypt trying to mount it too, so I can use that partition in a data recovery program. Also it's just an image file volume. I have read the documentation here: http://www.truecrypt.org/docs/?s=command-line-usage But I can't figure out which switch I need to use to only open an image and not mount it. I am using the Mac version, and I have set up an alias for the TrueCrypt shell command, so I can just type: truecrypt -t -v - ?? [][]..

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  • TrueCrypt: Open volume without mounting

    - by Totomobile
    I have a corrupt TrueCrypt volume. When I try to mount it, the password is fine but I get an error: hdiutil attach failed no mountable file systems I read a post that says you can try to recover the volume, but I have to open it first to try to recover it. I just need to open it without TrueCrypt trying to mount it too, so I can use that partition in a data recovery program. Also it's just an image file volume. I am using the Mac version, and I have setup an alias for the truecrypt shell command, but I'm not sure how to enter the syntax! Please help. thank you! T

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  • TrueCrypt: Open volume without mounting

    - by Totomobile
    I have a corrupt TrueCrypt volume. When I try to mount it, the password is fine but I get an error: hdiutil attach failed no mountable file systems I read a post that says you can try to recover the volume, but I have to open it first to try to recover it. I just need to open it without TrueCrypt trying to mount it too, so I can use that partition in a data recovery program. Also it's just an image file volume. I am using the Mac version, and I have setup an alias for the truecrypt shell command, but I'm not sure how to enter the syntax! Please help. thank you! T

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  • No web browsers open on Windows XP

    - by Carlos Torres
    I'm having a weird problem here. I upgraded a Windows XP computer from IE6 to IE8 yesterday and everything seemed to work normally until today. Now I can't open any browser on this computer. The computer had Google Chrome installed and it suddenly disappeared, I installed it again and now it dowsn't open either. I also installed Firefox and the same thing happened. The computer had no anti virus, I installed Ad-Aware, run a full scan and it detected some malware, but browsers are still not working Any ideas?

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  • Internal only DNS?

    - by ethrbunny
    We are running a research project with hundreds (becoming thousands) of remote hosts. Each host is running OpenVPN so we can find them regardless of what their 'assigned' IP is. We have been using DynDNS to manage this but we're running into some issues with them ( API is weak/nonexistent, size constraints, etc). Im looking into setting up a internal-only domain (EG "our.stuff" so a host would be "site1.our.stuff" or "site3.net4.our.stuff") that I can configure with the info from the OpenVPN server. Since we'd have to point our internal DNS to this machine it would have to be able to route/cache requests for 'external' machines as well. I've been trying to read about 'internal DNS', 'private', 'non-routeable' but I'm not having much success. Summary: need info on internal, caching DNS server. Something with open-source would be ideal. If not, I can script out changes to .conf, etc.

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  • Removing bing from my google search bar when I open a new tab

    - by user329869
    Bing has rudely planted its self on my "open new tab" so above bing my regular google is there but below is the irritating bing search bar! I have tried everything I know of to get rid of it and it will not go! I can not find it listed under my settings, control panel and/or uninstall! This is the second time bing has made its unwelcome tush comfy in my google area! How frustrating! I miss my mac book pro! Removing bing from my google search bar when I open a new tab.

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  • Why is port 444 open on this router?

    - by TJ Thind
    I have a Cisco RV110W. I ran nmap at it from the outside and nmap reports that the router has tcp port 444 open. Yet there are no port forwarding rules specifying this port. It should as far as I can tell, be closed. There's even a service listening to that port which I can connect to through telnet. I threw some SNPP commands at it but the service doesn't respond to any of them so I don't believe it's SNPP. Does anyone have any idea why this particular router has tcp port 444 open? I haven't been able to find anything in the manual or on Cisco's website.

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  • Use Web Browser (Google Chrome or Firefox) to Open Web Sites from a List in File

    - by MMA
    I have a (text) file containing a list of web site addresses. I know that I can open the file in an editor and then copy-paste the addresses to the browser address bar. That means, if I have ten addresses in that file, I will need ten copy-paste operations, which must be tedious. But is there a way to ask the browser (preferably Google Chrome or Firefox) to open all of them in one go in different tabs? I am using Ubuntu, if that is related in any way to the solution you provide.

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  • What are good replacements for Microsoft Visio 2003?

    - by James
    I have been using Visio 2003 on Windows XP for generation of UML diagrams. I have encountered following problems so far: There is no way to generate/print the documentation written for class attributes/methods. No automatic code generation is supported I have already generated lot of diagrams and i discovered above problems at much later stage. Now i would like to overcome above by choosing another tool which is compatible with Visio file(.vsd) which saves time or redrawing all diagrams and also provides above features. Could you kindly suggest an alternative (visio compatible) tool ? (I have looked at a similar SU-question, but it does not suggest tools which provide solution to above problems. I am open to free as well as licensed tools, with priority to free :) ) Thanks, James

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