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• Measures of association in R -- Kendall's tau-b and tau-c

  - by brentonk

  Are there any R packages for the calculation of Kendall's tau-b and tau-c, and their associated standard errors? My searches on Google and Rseek have turned up nothing, but surely someone has implemented these in R.

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• Emails forwarded via postfix get flagged as spam and forged in Gmail

  - by Kendall Hopkins

  I'm trying to setup a forwarding only email server. I'm running into the problem where all messages forwarded via postfix are getting put into gmail's spam folder and getting flagged as forged. I'm testing a very similar setup on a cpanel box and their forwarded emails make it through without any problem. Things I've done: Setup reverse dns on forwarding box Setup SPF record for forwarding box domain CPanel route (not flagged as spam): [email protected] - [email protected] - [email protected] AWS postfix route (flagged as spam): [email protected] - [email protected] - [email protected] Gmail error message: /etc/postfix/main.cf myhostname = sputnik.*domain*.com smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no append_dot_mydomain = no readme_directory = no myorigin = /etc/mailname mydestination = sputnik.*domain*.com, localhost.*domain*.com, , localhost relayhost = mynetworks = 127.0.0.0/8 10.0.0.0/24 [::1]/128 [fe80::%eth0]/64 mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all inet_protocols = all virtual_alias_maps = hash:/etc/postfix/virtual Email forwarded by CPanel (doesn't get marked as spam): Delivered-To: *personaluser*@gmail.com Received: by 10.182.144.98 with SMTP id sl2csp14396obb; Wed, 9 May 2012 09:18:36 -0700 (PDT) Received: by 10.182.52.38 with SMTP id q6mr1137571obo.8.1336580316700; Wed, 09 May 2012 09:18:36 -0700 (PDT) Return-Path: <mail@*personaldomain*.com> Received: from web6.*domain*.com (173.193.55.66-static.reverse.softlayer.com. [173.193.55.66]) by mx.google.com with ESMTPS id ec7si1845451obc.67.2012.05.09.09.18.36 (version=TLSv1/SSLv3 cipher=OTHER); Wed, 09 May 2012 09:18:36 -0700 (PDT) Received-SPF: neutral (google.com: 173.193.55.66 is neither permitted nor denied by best guess record for domain of mail@*personaldomain*.com) client-ip=173.193.55.66; Authentication-Results: mx.google.com; spf=neutral (google.com: 173.193.55.66 is neither permitted nor denied by best guess record for domain of mail@*personaldomain*.com) smtp.mail=mail@*personaldomain*.com Received: from mail-vb0-f43.google.com ([209.85.212.43]:56152) by web6.*domain*.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.77) (envelope-from <mail@*personaldomain*.com>) id 1SS9b2-0007J9-LK for mail@kendall.*domain*.com; Wed, 09 May 2012 12:18:36 -0400 Received: by vbbfq11 with SMTP id fq11so599132vbb.2 for <mail@kendall.*domain*.com>; Wed, 09 May 2012 09:18:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-originating-ip:date:message-id:subject:from:to :content-type:x-gm-message-state; bh=Hr0AH40uUtx/w/u9hltbrhHJhRaD5ubKmz2gGg44VLs=; b=IBKi6Xalr9XVFYwdkWxn9PLRB69qqJ9AjUPdvGh8VxMNW4S+hF6r4GJcGOvkDn2drO kw5r4iOpGuWUQPEMHRPyO4+Ozc9SE9s4Px2oVpadR6v3hO+utvFGoj7UuchsXzHqPVZ8 A9FS4cKiE0E0zurTjR7pfQtZT64goeEJoI/CtvcoTXj/Mdrj36gZ2FYtO8Qj4dFXpfu9 uGAKa4jYfx9zwdvhLzQ3mouWwQtzssKUD+IvyuRppLwI2WFb9mWxHg9n8y9u5IaduLn7 7TvLIyiBtS3DgqSKQy18POVYgnUFilcDorJs30hxFxJhzfTFW1Gdhrwjvz0MTYDSRiGQ P4aw== MIME-Version: 1.0 Received: by 10.52.173.209 with SMTP id bm17mr326586vdc.54.1336580315681; Wed, 09 May 2012 09:18:35 -0700 (PDT) Received: by 10.220.191.134 with HTTP; Wed, 9 May 2012 09:18:35 -0700 (PDT) X-Originating-IP: [99.50.225.7] Date: Wed, 9 May 2012 12:18:35 -0400 Message-ID: <CA+tP6Viyn0ms5RJoqtd20ms3pmQCgyU0yy7GBiaALEACcDBC2g@mail.gmail.com> Subject: test5 From: Kendall Hopkins <mail@*personaldomain*.com> To: mail@kendall.*domain*.com Content-Type: multipart/alternative; boundary=bcaec51b9bf5ee11c004bf9cda9c X-Gm-Message-State: ALoCoQm3t1Hohu7fEr5zxQZsC8FQocg662Jv5MXlPXBnPnx2AiQrbLsNQNknLy39Su45xBMCM47K X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - web6.*domain*.com X-AntiAbuse: Original Domain - kendall.*domain*.com X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - *personaldomain*.com X-Source: X-Source-Args: X-Source-Dir: --bcaec51b9bf5ee11c004bf9cda9c Content-Type: text/plain; charset=ISO-8859-1 test5 --bcaec51b9bf5ee11c004bf9cda9c Content-Type: text/html; charset=ISO-8859-1 test5 --bcaec51b9bf5ee11c004bf9cda9c-- Email forwarded via AWS postfix box (marked as spam): Delivered-To: *personaluser*@gmail.com Received: by 10.182.144.98 with SMTP id sl2csp14350obb; Wed, 9 May 2012 09:17:46 -0700 (PDT) Received: by 10.229.137.143 with SMTP id w15mr389471qct.37.1336580266237; Wed, 09 May 2012 09:17:46 -0700 (PDT) Return-Path: <mail@*personaldomain*.com> Received: from sputnik.*domain*.com (sputnik.*domain*.com. [107.21.39.201]) by mx.google.com with ESMTP id o8si1330855qct.115.2012.05.09.09.17.46; Wed, 09 May 2012 09:17:46 -0700 (PDT) Received-SPF: neutral (google.com: 107.21.39.201 is neither permitted nor denied by best guess record for domain of mail@*personaldomain*.com) client-ip=107.21.39.201; Authentication-Results: mx.google.com; spf=neutral (google.com: 107.21.39.201 is neither permitted nor denied by best guess record for domain of mail@*personaldomain*.com) smtp.mail=mail@*personaldomain*.com Received: from mail-vb0-f52.google.com (mail-vb0-f52.google.com [209.85.212.52]) by sputnik.*domain*.com (Postfix) with ESMTP id A308122AD6 for <mail@*personaldomain2*.com>; Wed, 9 May 2012 16:17:45 +0000 (UTC) Received: by vbzb23 with SMTP id b23so448664vbz.25 for <mail@*personaldomain2*.com>; Wed, 09 May 2012 09:17:45 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-originating-ip:date:message-id:subject:from:to :content-type:x-gm-message-state; bh=XAzjH9tUXn6SbadVSLwJs2JVbyY4arosdTuV8Nv+ARI=; b=U8gIgHd6mhWYqPU4MH/eyvo3kyZsDn/GiYwZj5CLbs6Zz/ZOXQkenRi7zW3ewVFi/9 uAFylT8SQ+Wjw2l6OgAioCTojfZ58s4H/JW+1bu460KAP9aeOTcZDNSsHlsj0wvH5XRV 4DQJa11kz+WFVtVVcFuB33WVUPAgJfXzY+pSTe+FWsrZyrrwL7/Vm9TSKI5PBwRN9i4g zAZabgkmw1o2THT3kbJi6vAbPzlqK2LVbgt82PP0emHdto7jl4iD5F6lVix4U0dsrtRv xuGUE0gDyIwJuR4Q5YTkNubwGH/Y2bFBtpx2q1IORANrolWxIGaZSceUWawABkBGPABX 1/eg== MIME-Version: 1.0 Received: by 10.52.96.169 with SMTP id dt9mr282954vdb.107.1336580265812; Wed, 09 May 2012 09:17:45 -0700 (PDT) Received: by 10.220.191.134 with HTTP; Wed, 9 May 2012 09:17:45 -0700 (PDT) X-Originating-IP: [99.50.225.7] Date: Wed, 9 May 2012 12:17:45 -0400 Message-ID: <CA+tP6VgqZrdxP543Y28d1eMwJAs4DxkS4EE6bvRL8nFoMkgnQQ@mail.gmail.com> Subject: test4 From: Kendall Hopkins <mail@*personaldomain*.com> To: mail@*personaldomain2*.com Content-Type: multipart/alternative; boundary=20cf307f37f6f521b304bf9cd79d X-Gm-Message-State: ALoCoQkrNcfSTWz9t6Ir87KEYyM+zJM4y1AbwP86NMXlk8B3ALhnis+olFCKdgPnwH/sIdzF3+Nh --20cf307f37f6f521b304bf9cd79d Content-Type: text/plain; charset=ISO-8859-1 test4 --20cf307f37f6f521b304bf9cd79d Content-Type: text/html; charset=ISO-8859-1 test4 --20cf307f37f6f521b304bf9cd79d--

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• o2cb thinks ocfs2 cluster is still online, and refuses to shut down

  - by Kendall

  I have a handful of OpenSuSE 11.2 servers that utilize OCFS2 volumes. I've noticed that o2cb can't figure out when the OCFS2 cluster is actually mounted. For example, when I try to shutdown o2cb, after stopping OCSF2, o2cb refuses to shutdown because it thinks OCFS2 is still up! After stopping OCFS2 I try to stop o2cb... hamguy:/dev/disk/by-label # /etc/init.d/o2cb stop Stopping O2CB cluster ocfs2: Failed Unable to stop cluster as heartbeat region still active So I check the status... hamguy:/dev/disk/by-label # /etc/init.d/o2cb status Driver for "configfs": Loaded Filesystem "configfs": Mounted Stack glue driver: Loaded Stack plugin "o2cb": Loaded Driver for "ocfs2_dlmfs": Loaded Filesystem "ocfs2_dlmfs": Mounted Checking O2CB cluster ocfs2: Online Heartbeat dead threshold = 31 Network idle timeout: 30000 Network keepalive delay: 2000 Network reconnect delay: 2000 Checking O2CB heartbeat: Active And double check OCFS2... hamguy:/dev/disk/by-label # /etc/init.d/ocfs2 status Configured OCFS2 mountpoints: /u/conf /u/logs /u/backup /u/client /u/data /u/mdata OCFS2 is clearly down, while o2cb clearly thinks otherwise. The versions of OCFS2 and o2cb are... kendall@hamguy:~> rpm -qa |grep ocfs2 ocfs2console-1.4.1-25.6.x86_64 ocfs2-tools-o2cb-1.4.1-25.6.x86_64 ocfs2-tools-1.4.1-25.6.x86_64 kendall@hamguy:~> rpm -qa |grep o2cb ocfs2-tools-o2cb-1.4.1-25.6.x86_64 What causes this, and is there a way around it? If I try to reboot the machine, it will just sit there forever until your physically power cycle it. That obviously is a bit of a problem. Any insight is appreciated, thank you. Kendall

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• Loading, listing, and using R Modules and Functions in PL/R

  - by Dave Jarvis

  I am having difficulty with: Listing the R packages and functions available to PostgreSQL. Installing a package (such as Kendall) for use with PL/R Calling an R function within PostgreSQL Listing Available R Packages Q.1. How do you find out what R modules have been loaded? SELECT * FROM r_typenames(); That shows the types that are available, but what about checking if Kendall( X, Y ) is loaded? For example, the documentation shows: CREATE TABLE plr_modules ( modseq int4, modsrc text ); That seems to allow inserting records to dictate that Kendall is to be loaded, but the following code doesn't explain, syntactically, how to ensure that it gets loaded: INSERT INTO plr_modules VALUES (0, 'pg.test.module.load <-function(msg) {print(msg)}'); Q.2. What would the above line look like if you were trying to load Kendall? Q.3. Is it applicable? Installing R Packages Using the "synaptic" package manager the following packages have been installed: r-base r-base-core r-base-dev r-base-html r-base-latex r-cran-acepack r-cran-boot r-cran-car r-cran-chron r-cran-cluster r-cran-codetools r-cran-design r-cran-foreign r-cran-hmisc r-cran-kernsmooth r-cran-lattice r-cran-matrix r-cran-mgcv r-cran-nlme r-cran-quadprog r-cran-robustbase r-cran-rpart r-cran-survival r-cran-vr r-recommended Q.4. How do I know if Kendall is in there? Q.5. If it isn't, how do I find out what package it is in? Q.6. If it isn't in a package suitable for installing with apt-get (aptitude, synaptic, dpkg, what have you), how do I go about installing it on Ubuntu? Q.7. Where are the installation steps documented? Calling R Functions I have the following code: EXECUTE 'SELECT ' 'regr_slope( amount, year_taken ),' 'regr_intercept( amount, year_taken ),' 'corr( amount, year_taken ),' 'sum( measurements ) AS total_measurements ' 'FROM temp_regression' INTO STRICT slope, intercept, correlation, total_measurements; This code calls the PostgreSQL function corr to calculate Pearson's correlation over the data. Ideally, I'd like to do the following (by switching corr for plr_kendall): EXECUTE 'SELECT ' 'regr_slope( amount, year_taken ),' 'regr_intercept( amount, year_taken ),' 'plr_kendall( amount, year_taken ),' 'sum( measurements ) AS total_measurements ' 'FROM temp_regression' INTO STRICT slope, intercept, correlation, total_measurements; Q.8. Do I have to write plr_kendall myself? Q.9. Where can I find a simple example that walks through: Loading an R module into PG. Writing a PG wrapper for the desired R function. Calling the PG wrapper from a SELECT. For example, would the last two steps look like: create or replace function plr_kendall( _float8, _float8 ) returns float as ' agg_kendall(arg1, arg2) ' language 'plr'; CREATE AGGREGATE agg_kendall ( sfunc = plr_array_accum, basetype = float8, -- ??? stype = _float8, -- ??? finalfunc = plr_kendall ); And then the SELECT as above? Thank you!

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• Is there any functional difference between immutable value types and immutable reference types?

  - by Kendall Frey

  Value types are types which do not have an identity. When one variable is modified, other instances are not. Using Javascript syntax as an example, here is how a value type works. var foo = { a: 42 }; var bar = foo; bar.a = 0; // foo.a is still 42 Reference types are types which do have an identity. When one variable is modified, other instances are as well. Here is how a reference type works. var foo = { a: 42 }; var bar = foo; bar.a = 0; // foo.a is now 0 Note how the example uses mutatable objects to show the difference. If the objects were immutable, you couldn't do that, so that kind of testing for value/reference types doesn't work. Is there any functional difference between immutable value types and immutable reference types? Is there any algorithm that can tell the difference between a reference type and a value type if they are immutable? Reflection is cheating. I'm wondering this mostly out of curiosity.

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• Licensing a JavaScript library

  - by Kendall Frey

  I am developing a free, open-source (duh) JavaScript library, and wondering how to license it. I was considering the GNU GPL, but I heard that I must distribute the license with the software, and I'm not sure anymore. I would like the library to be available much like jQuery: In a free, downloadable script, preferably in either original or minified form. Am I mistaken about the GNU GPL license terms? jQuery is dual licensed under GNU GPL or MIT licenses. How does the GPL apply to single script files like that? Can I license my library with nothing more than a few sentences in the script file? Is there another license that better suits my needs? What would be nice is a license that allows you to put the URL in the source, for people to read if they want. I don't know that many do, unless I am mistaken. I am generally looking to release the library as free software like the GPL specifies, but don't want to have to force licensees to download the full license unless they wish to read it.

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• What's the standard location of a 3D clipping box?

  - by Kendall Frey

  The way I understand 3D rendering, polygons are transformed using several matrices, and they are then clipped if they are not inside a certain box, before projecting the box onto the screen. Before transformation, the visible area is typically a frustum, and after transformation, I am guessing it's a cube. This cube makes the clipping math easier than a frustum would. My question is, what's the 'standard' location/size for this clipping box? I can think of 3 possibilities: (0,0,0)-(1,1,1), (-0.5,-0.5,-0.5)-(0.5,0.5,0.5), (-1,-1,-1)-(1,1,1) Or is there no standard?

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• When should I make the first commit to source control?

  - by Kendall Frey

  I'm never sure when a project is far enough along to first commit to source control. I tend to put off committing until the project is 'framework-complete' and primarily commit features from then on. (I haven't done any personal projects large enough to have a core framework too big for this.) I have a feeling this isn't best practice, though I'm not sure what all could go wrong. Let's say, for example, I have a project which consists of a single code file. It will take about 10 lines of boilerplate code, and 100 lines to get the project working with extremely basic functionality (1 or 2 features). Should I first check in: The empty file? The boilerplate code? The first features? At some other point? Also, what are the reasons to check in at a specific point?

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• VirtualBox host-only networking fails on Ubuntu 11.10 host

  - by Jeremy Kendall

  I've installed Ubuntu 11.10 on a new Lenovo Thinkpad 420s and I'm trying to get some VirtualBox VMs up and running (using Vagrant). Everything works fine until I try to add host-only networking. This is the failure I get in the terminal: I set logging to debug and tried again. Here's a paste of the relevant portion of the log. When I try to add host-only networks with the VirtualBox gui (File-Preferences-Networking-Add host-only networking), I get the following error message: This error is occurring with three different virtual boxes, all Ubuntu 11.10 64bit guests, one of which I've run without issue on a Windows host and an OSX host. Here is the Vagrantfile for the box I've successfully run on Windows and OSX: Vagrant::Config.run do |config| config.vm.box = "ubuntu-11.10" config.vm.box_url = "http://timhuegdon.com/vagrant-boxes/ubuntu-11.10.box" config.vm.network :hostonly, "192.168.33.10" config.vm.customize ["modifyvm", :id, "--memory", "512"] config.vm.customize ["modifyvm", :id, "--natnet1", "10.0.28.0/24"] config.vm.forward_port 80, 4567 end I've tried two other boxes as well, one of which I built last night with veewee, all of which are getting the exact same error. I've used rvm to install ruby 1.9.3-p125 [ x86_64 ], and I've got Vagrant running in its own gemset. I've Googled quite a lot and haven't been able to find any resolution. Suggestions?

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• Referencing environment variables *in* /etc/environment?

  - by Stefan Kendall

  I recently discovered /etc/environment, which seems a more standard way to setup simple environment variables than scripts, but I was wondering if there was a way to back-reference environment variables in the /etc/environment file. That is, I have this: JAVA_HOME="/tools/java" GRAILS_HOME="/tools/grails" GROOVY_HOME="/tools/groovy" GRADLE_HOME="/tools/gradle" PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" If I try to add $JAVA_HOME/bin to the PATH definition, however, I get $JAVA_HOME/bin, and not the interpolated variable. To remedy this, I'm creating environment.sh in profile.d to add the /bin entries to the path, but this seems sloppy and disorganized. Is there a way to backreference the environment variables in /etc/environment?

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• Use 3 monitors w/built-in intel adapter + two old nvidia PCI cards on 10.10?

  - by Kendall Gifford

  I'd like to move from windows with my current workstation. The only thing holding me back is that I have 3 monitors connected to the system and I really take advantage of the real estate when working. I just installed Ubuntu 10.10 on the system and one of the monitors is up and running just fine. This monitor is connected to the built-in Intel adapter. I also have two old nVidia GeForce4 MX 4000 (nv19pl) cards in my two PCI slots with two monitors connected to them respectively. I installed the legacy (and proprietary) nVidia drivers (the nvidia-96 package) that claims to support these old cards. Now the question is how to get X configured to use all adapters (using two different drivers) so I can use all three monitors (and is this even possible)? From what I've read, it looks like I'll have to write an xorg.conf file since the nVidia driver doesn't support the auto-magic configuration supported by other drivers. On this site: http://wiki.ubuntu.com/X/Config it says that on 10.10 I just need to write an xorg.conf "containing only those sections and options that you need to override Xorg's autoconfigurated settings". So, does this mean I can get away with only including the nVidia-specific configuration stuff and all else will get auto-configured? Or, will providing a config with a "Device" section overrule the auto-magic from detecting/using the Intel adapter? I ran the included nvidia-xconfig to generate a basic, nVidia-specific xorg.conf but I'm hesitant to reboot with it in place, suspecting I'll have a screwed up display. Also, is there any way (any tool or command) to generate an xorg.conf from the current, auto-configured running state of an X session? If I have to write a full, complete config, I'd rather start with one that includes everything that's been auto-detected thus far (and merge it with my nVidia version). Anyhow, any info and thoughts are greatly appreciated (as are answers).

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• How to pass a filename by drag-and-drop to a shortcut in Windows

  - by Kendall Frey

  I have a program program.exe and a document document.txt, and to open the document, I can drag document.txt onto program.exe. So far so good. Now I want to call it with a command-line parameter -param so that the full command line is program.exe -param document.txt Unfortunately, I can't do this with drag and drop, so I need to fire up cmd and type in the command manually. This takes too long, and I need an easier way. How can I create a shortcut that I can drop the file onto, and have it call the program with the command-line parameter? I tried setting the shortcut to program.exe -param "%1", but that didn't work, because it appeared to pass only the file name, and not the path, and since the current directory was the one with the program and not the one with the document, it couldn't find the document.

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• How to pass a filename to a shortcut in Windows

  - by Kendall Frey

  I have a program program.exe and a document document.txt, and to open the document, I can drag document.txt onto program.exe. So far so good. Now I want to call it with a command-line parameter -param so that the full command line is program.exe -param document.txt Unfortunately, I can't do this with drag and drop, so I need to fire up cmd and type in the command manually. This takes too long, and I need an easier way. How can I create a shortcut that I can drop the file onto, and have it call the program with the command-line parameter? I tried setting the shortcut to program.exe -param "%1", but that didn't work, because it appeared to pass only the file name, and not the path, and since the current directory was the one with the program and not the one with the document, it couldn't find the document.

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• iperf max udp multicast performance peaking at 10Mbit/s?

  - by Tom Frey

  I'm trying to test UDP multicast throughput via iperf but it seems like it's not sending more than 10Mbit/s from my dev machine: C:\> iperf -c 224.0.166.111 -u -T 1 -t 100 -i 1 -b 1000000000 ------------------------------------------------------------ Client connecting to 224.0.166.111, UDP port 5001 Sending 1470 byte datagrams Setting multicast TTL to 1 UDP buffer size: 8.00 KByte (default) ------------------------------------------------------------ [156] local 192.168.1.99 port 49693 connected with 224.0.166.111 port 5001 [ ID] Interval Transfer Bandwidth [156] 0.0- 1.0 sec 1.22 MBytes 10.2 Mbits/sec [156] 1.0- 2.0 sec 1.14 MBytes 9.57 Mbits/sec [156] 2.0- 3.0 sec 1.14 MBytes 9.55 Mbits/sec [156] 3.0- 4.0 sec 1.14 MBytes 9.56 Mbits/sec [156] 4.0- 5.0 sec 1.14 MBytes 9.56 Mbits/sec [156] 5.0- 6.0 sec 1.15 MBytes 9.62 Mbits/sec [156] 6.0- 7.0 sec 1.14 MBytes 9.53 Mbits/sec When I run it on another server, I'm getting ~80Mbit/s which is quite a bit better but still not anywhere near the 1Gbps limits that I should be getting? C:\> iperf -c 224.0.166.111 -u -T 1 -t 100 -i 1 -b 1000000000 ------------------------------------------------------------ Client connecting to 224.0.166.111, UDP port 5001 Sending 1470 byte datagrams Setting multicast TTL to 1 UDP buffer size: 8.00 KByte (default) ------------------------------------------------------------ [180] local 10.0.101.102 port 51559 connected with 224.0.166.111 port 5001 [ ID] Interval Transfer Bandwidth [180] 0.0- 1.0 sec 8.60 MBytes 72.1 Mbits/sec [180] 1.0- 2.0 sec 8.73 MBytes 73.2 Mbits/sec [180] 2.0- 3.0 sec 8.76 MBytes 73.5 Mbits/sec [180] 3.0- 4.0 sec 9.58 MBytes 80.3 Mbits/sec [180] 4.0- 5.0 sec 9.95 MBytes 83.4 Mbits/sec [180] 5.0- 6.0 sec 10.5 MBytes 87.9 Mbits/sec [180] 6.0- 7.0 sec 10.9 MBytes 91.1 Mbits/sec [180] 7.0- 8.0 sec 11.2 MBytes 94.0 Mbits/sec Anybody has any idea why this is not achieving close to link limits (1Gbps)? Thanks, Tom

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• Syncing Google Desktop Scratch Pad

  - by Anders Frey

  I'm a long time user of Google Desktop Scratch Pad and I would like to be able to put the note in the cloud and make it accessible from all my electronic units. I'm working towards changing the filepath Scratch Pad uses to retrieve the .txt to lead to a DropBox folder. As the Desktop Scratch Pad is discontinued I've had no luck in retrieving the API, but what I've got so far is this: The scratch pad data is located at: C:\Users[user]\AppData\Local\Google\Google Desktop\a3d83d5fa2e9\scratchpad.txt The registry keys related to Google Desktop is located at: HKEY_CURRENT_USER\Software\Google\Google Desktop I'm guessing the Scratch Pad app itself is located at: HKEY_CURRENT_USER\Software\Google\Google Desktop\Components I have limited experience with the registry, so I'm not able to translate the binary and hexadecimals, but I'm hoping that the path location is in there somewhere. I've tried using a bunch of other noteapps (including the 'new' scratch pad in chrome) but haven't been able to find one that suits my needs as Desktop Scratch Pad. Hence the effort in this matter. I may be way off and I'm not sure if this is possible to do, but I'm looking forward to hearing your thoughts.

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• The PASS Board of Directors Q&A Session

  - by andyleonard

  Friday afternoon (18 Oct 2013), the PASS Board of Directors met with interested members of the SQL Server Community to answer questions. Paraphrases of some questions and notes I collected during the session follow (Please note: this is not a transcript): Elections Kendall Van Dyke asked about duplicate voting. The Board responded that they had looked into the matter and identified duplicate memberships based on names and addresses, but with different email addresses. After filtering for duplicate...(read more)

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• Implementing a Patricia Trie for use as a dictionary

  - by Regis Frey

  I'm attempting to implement a Patricia Trie with the methods addWord(), isWord(), and isPrefix() as a means to store a large dictionary of words for quick retrieval (including prefix search). I've read up on the concepts but they just aren't clarifying into an implementation. I want to know (in Java or Python code) how to implement the Trie, particularly the nodes (or should I implement it recursively). I saw one person who implemented it with an array of 26 child nodes set to null/None. Is there a better strategy (such as treating the letters as bits) and how would you implement it?

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• PHP page load seems to be requesting itself and misinterpreting the result

  - by Regis Frey

  I'm working on a messy PHP page by another developer and I was analyzing the resource view in the Webkit developer tools and noticed that the page (index.php) makes an HTTP requests for itself and then interprets the results as an image despite it being sent with the text/html header. Because of this it throws the warning: Resource interpreted as image but transferred with MIME type text/html. Looking at the time graph the call comes after the <head> because it has already requested images for the body. Sometimes there are even two 'bad' requests. Can anyone explain what might be happening and/or suggest how to fix this? Could these be related to PHP includes?

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• C# UDP decoding datagrams fails randomly

  - by Tom Frey

  Hi, I'm experiencing an issue in a multi threaded application and have been debugging it for the last 3 days but for the life of it can not figure it out. I'm writing this, hoping that I either have a DUH moment when typing this or somebody sees something obvious in the code snippets I provide. Here's what's going on: I've been working on a new UDP networking library and have a data producer that multicasts UDP datagrams to several receiver applications. The sender sends on two different sockets that are bound to separate UDP multicast addresses and separate ports. The receiver application also creates two sockets and binds each one to one of the sender's multicast address/port. When the receiver receives the datagram, it copies it from the the buffer in a MemoryStream which is then put onto a thread safe queue, where another thread reads from it and decodes the data out of the MemoryStream. Both sockets have their own queues. What happens now is really weird, it happens randomly, non-reproducible and when I run multiple receiver applications, it only happens randomly on one of them every now and then. Basically, the thread that reads the MemoryStream out of the queue, reads it via a BinaryReader like ReadInt32(), etc. and thereby decodes the data. Every now and then however when it reads the data, the data it reads from it is incorrect, e.g. a negative integer number which the sender never would encode. However, as mentioned before, the decoding only fails in one of the receiver applications, in the other ones the datagram decodes fine. Now you might be saying, well, probably the UDP datagram has a byte corruption or something but I've logged every single datagram that's coming in and compared them on all receivers and the datagrams every application receives are absolutely identical. Now it gets even weirder, when I dump the datagram that failed to decode to disk and write a unit test that reads it and runs it through the decoder, it decodes just fine. Also when I wrap a try/catch around the decoder, reset the MemoryStream position in the catch and run it through the decoder again, it decodes just fine. To make it even weirder, this also only happens when I bind both sockets to read data from the sender, if I only bind one, it doesn't happen or at least I wasn't able to reproduce it. Here are is some corresponding code to what's going on: This is the receive callback for the socket: private void ReceiveCompleted(object sender, SocketAsyncEventArgs args) { if (args.SocketError != SocketError.Success) { InternalShutdown(args.SocketError); return; } if (args.BytesTransferred > SequencedUnitHeader.UNIT_HEADER_SIZE) { DataChunk chunk = new DataChunk(args.BytesTransferred); Buffer.BlockCopy(args.Buffer, 0, chunk.Buffer, 0, args.BytesTransferred); chunk.MemoryStream = new MemoryStream(chunk.Buffer); chunk.BinaryReader = new BinaryReader(chunk.MemoryStream); chunk.SequencedUnitHeader.SequenceID = chunk.BinaryReader.ReadUInt32(); chunk.SequencedUnitHeader.Count = chunk.BinaryReader.ReadByte(); if (prevSequenceID + 1 != chunk.SequencedUnitHeader.SequenceID) { log.Error("UdpDatagramGap\tName:{0}\tExpected:{1}\tReceived:{2}", unitName, prevSequenceID + 1, chunk.SequencedUnitHeader.SequenceID); } else if (chunk.SequencedUnitHeader.SequenceID < prevSequenceID) { log.Error("UdpOutOfSequence\tName:{0}\tExpected:{1}\tReceived:{2}", unitName, prevSequenceID + 1, chunk.SequencedUnitHeader.SequenceID); } prevSequenceID = chunk.SequencedUnitHeader.SequenceID; messagePump.Produce(chunk); } else UdpStatistics.FramesRxDiscarded++; Socket.InvokeAsyncMethod(Socket.ReceiveAsync, ReceiveCompleted, asyncReceiveArgs); } Here's some stub code that decodes the data: public static void OnDataChunk(DataChunk dataChunk) { try { for (int i = 0; i < dataChunk.SequencedUnitHeader.Count; i++) { int val = dataChunk.BinaryReader.ReadInt32(); if(val < 0) throw new Exception("EncodingException"); // do something with that value } } catch (Exception ex) { writer.WriteLine("ID:" + dataChunk.SequencedUnitHeader.SequenceID + " Count:" + dataChunk.SequencedUnitHeader.Count + " " + BitConverter.ToString(dataChunk.Buffer, 0, dataChunk.Size)); writer.Flush(); log.ErrorException("OnDataChunk", ex); log.Info("RETRY FRAME:{0} Data:{1}", dataChunk.SequencedUnitHeader.SequenceID, BitConverter.ToString(dataChunk.Buffer, 0, dataChunk.Size)); dataChunk.MemoryStream.Position = 0; dataChunk.SequencedUnitHeader.SequenceID = dataChunk.BinaryReader.ReadUInt32(); dataChunk.SequencedUnitHeader.Count = dataChunk.BinaryReader.ReadByte(); OnDataChunk(dataChunk); } } You see in the catch{} part I simply reset the MemoryStream.Position to 0 and call the same method again and it works just fine that next time? I'm really out of ideas at this point and unfortunately had no DUH moment writing this. Anybody have any kind of idea what might be going on or what else I could do to troubleshoot this? Thanks, Tom

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• WCF issues with KnownType for Dictionary

  - by Tom Frey

  Hi, I have a service that implements the following DataMember: [DataMember] public Dictionary<string, List<IOptionQueryResult>> QueryResultItems { get; set; } I have the class "OptionQuerySingleResult" which inherits from IOptionQueryResult. Now, I understand that I need to make the OptionQueryResult type "known" to the Service and thus tried to add the KnownType in various ways: [KnownType(typeof(Dictionary<string, OptionQuerySingleResult[]>))] [KnownType(typeof(Dictionary<string, List<OptionQuerySingleResult>>))] [KnownType(typeof(OptionQuerySingleResult)] However, none of those approaches worked and on the client side I'm either getting that deserialization failed or the server simply aborted the request, causing a connection aborted error. Does anyone have an idea on what's the proper way to get this to work? I'd like to add, the if I change the QueryResultItems definition to use the concrete type, instead of the interface, everything works just fine. Thanks, Tom

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• ProcessCmdKey - wait for KeyUp?

  - by Tom Frey

  Hi, I'm having the following issue in a WinForms app. I'm trying to implement Hotkeys and I need to process Key messages whenever the control is active, no matter if the focus is on a textbox within that control, etc. Overriding ProcessCmdKey works beautifully for this and does exactly what I want with one exception: If a user presses a key and keeps it pressed, ProcessCmdKey keeps triggering WM_KEYDOWN events. However, what I want to achieve is that the user has to release the button again before another hotkey action would trigger (so, if someone sits on the keyboard it would not cause continuous hotkey events). However, I can't find where to catch WM_KEYUP events, so I can set a flag if it should process ProcessCmdKey messages again? Anyone can help out here? Thanks, Tom

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• Error logged in WebKit Web Inspector disappears because of page refresh

  - by Regis Frey

  I'm hunting a Javascript error related to form submission (more importantly preventing it). I see the error appear in the Web Inspector but it disappears immediately since the form submits and refreshes the page. Is there a console history or scrollback? How can I see what the error is?

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• IE7 div floating bug

  - by Michael Frey

  I have the following <div id="border" style="width:100%; border:8px solid #FFF"> <div id="menu" style="width:250px; float:left;" > Some menu </div> <div id="content" style="padding-left:270px; width:520px;" > Main page content </div> </div> This gives me a left aligned menu and the content to the right of it, all surrounded by a border. On all browsers including IE8 it displays correctly. But on IE7 the content only starts below the menu, and leaves a big open space to the right of the menu. I have searched all kind of solutions and tried all kinds of combinations of right, left, none for float. clearing left right both. It always displays different on the browsers. Any help is appreciated. Michael

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• StructureMap: Wiring (generic) implementations to an implementation of another type

  - by Jeremy Frey

  If I have an interface: public interface IRepository<T> And an abstract class: public abstract class LinqToSqlRepository<T, TContext> : IRepository<T> where T : class where TContext : DataContext And a whole bunch of implementations of IRepository / LinqToSqlRepository (e.g. AccountRepository, ContactRepository, etc.), what's the best way to to use StructureMap (2.5.3) to generically wire them all up? e.g., I want this code to pass: [Test] public void ShouldWireUpAccountRepositories { var accountRepo = ObjectFactory.GetInstance<IRepository<Account>>(); Assert.IsInstanceOf<AccountRepository>(accountRepo); } Without explicitly writing this: ObjectFactory.Configure(x => x.ForRequestedType<IRepository<Account>>() .TheDefaultIsConcreteType<AccountRepository>()); In the past, we've always created a specific interface on each repository that inherited from the generic one, and used the default scanner to automatically wire all of those instances, but I'd like to be able to ask specifically for an IRepository<Account> without cluttering up the project with additional interfaces / configurations.

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• PHP code not working on IE

  - by Michael Frey

  I have a website with a flag. If it is clicked, the language of the website changes. Here is the code displaying the flag, which is a form with post event: <?php $pagename = $_SERVER['REQUEST_URI']; echo '<form action="'.$pagename.'" method="post"> <input name="formlanguage" type="image" '; if ($_SESSION['lang'] == 0) { echo 'alt="English" src="images/en.png" value="1" '; } else { echo 'alt="Deutsch" src="images/de.png" value="0" '; } echo '/></form>'; ?> Here is the response to that, and this part always fails on IE: if (isset($_POST['formlanguage'])) { $_SESSION['lang']=$_POST['formlanguage']; } I can not figure out why it works on Chrome but not IE. I assume that it might be a setting of IE. But what could that be?

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