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• Controlling an amplifier power supply from Squeezebox/SqueezeCenter

  - by teabot

  I have a Squeezebox that is connected to an amplifier. I'd like the amplifier to switch on/off whenever the Squeezebox is powered on/off. I don't mind writing some plugin code to SqueezeCenter to do this but in hardware terms I am looking for off-the-shelf components. I imagine that I need some kind of Ethernet controlled power outlet. I have looked at X10 (I can't bring myself to link to their terrible site), but their product range seems extremely confused and it looks as though I'd have to use both RF and comms-over-mains to implement a computer controlled socket. Does anyone have any alternative suggestions? Note: Any components should be available and certified for use in the UK.

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• What is meant by the terms CPU, Core, Die and Package?

  - by lovesh

  Now this might sound like too many previous questions, but I am really confused about these terms. I was trying to understand how "dual core" is different from "Core 2 Duo", and I came across some answers. For example, this answer states: Core 2 Duo has two cores inside a single physical package and dual core is 2 cpu in a package 2 cpu's in a die = 2 cpu's made together 2 cpu's in package = 2 cpu's on small board or linked in some way Now, is a core different from a CPU? What I understand is there is something that does all the heavy computation, decision making, math and other stuff (aka "processing") is called a CPU. Now what is a Core? And what is a processor when somebody says he has got a Core 2 Duo? And in this context what is a Package and what is a Die? I still don't understand the difference between Core 2 Duo and Dual Core. And can somebody explain hyper-threading (symmetric multi-threading) too if they are super generous?

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• Rate-Limit affects All clients or single IP?

  - by Asad Moeen

  Well up-til now I've considered iptables rate-limit commands with the "recent" module to work for each IP Address. For example rate-limit rule of 20k/s will trigger only if a single IP exceeds 20k/s rate and not if 4 different IPs exceed 5k/s rate. Please correct me if I considered this wrong as I've only used these rules for TCP/ UDP. But today I tried similar rules for ICMP and applied 4/s Input/Output. But then on trying to ping-test from just-ping.com I could see packet loss on almost all IP Addresses. How could that happen because if it worked for each IP Address then it wouldn't be triggering the rule because I believe each IP from just-ping has a rate of probably 1/s. I still think the first one is true because if it wasn't then my GameServer would block everyone if the combined rate ( in case of more connected players ) increased the threshold. This hasn't happened up til now so the ICMP thing really confused me. Thank you.

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• Multiple outliers for two variable linear regression

  - by Dave Jarvis

  Problem Building on my previous question, the "extreme" outliers in the following graph are somewhat obvious: Question Given: T - Set of all temperatures Y - Set of all years ST - Sum of temperatures. SY - Sum of years. N - Number of elements T(n) - Temperature of the nth element in the temperature set How would you implement an efficient MySQL stored procedure or user-defined function (UDF) to determine if T(n) is an outlier? (If such an implementation already exists, that would be good to know as well.) Related Sites I am slowly working through these sites to get a better understanding of the problem: Multiple Outliers Detection Procedures in Linear Regression M-estimator Measure of Surprise for Outlier Detection Ordinary Least Squares Linear Regression Many thanks!

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• how to set the background image property of a div to a dynamically generated image

  - by tixrus

  I have some divs and each one has its own background image. The base images as stored is just a black silhouette. What I would like to do is use the PHP GD package to modify the color of those images somewhat randomly and have the modified randomly coloured images be the background images of the divs. One way to do it is just create GD images structures from the original files, modify them, save the results as a temp file, pass this filename into the client, and then use jquery to modify the css background image properties of the divs to be the new file. But this is going to leave a lot of files laying around to garbage collect. Is there some way to do it without creating a bunch of files?

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• Selling an app to a company - How much to charge?

  - by Moshe

  I wrote an app targeting a particular clientele. A software company with a reputation among my target audience is willing to negotiate a price to either license or buy it. As a newcomer to the app store, I am not sure that I will successfully market it myself. What would be appropriate terms of a sale or license and what about pricing? I am looking for answers that draw from personal experience with software, although not necessarily apps. I've seen this post on SO, but it's a few years old and I assume that the app market has changed and stabilized somewhat. Thanks.

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• Best Java 'framework' for LOW-END 3D Graphics?

  - by CodeJustin.com

  I've made my share of 2D games on various platforms but I have never developed a 3D game. I want to make a small "mmorpg". I already made my server in python and it works just fine with my flash 2D game but I decided I want to step it up and try out 3D. I want to make a 3D game for the web browser and I think Java might be a good choice for this. So basically I'm just looking for a straight forward and well documents 'framework' to make LOW-END 3D games. Keep in mind that I will be targeting peoples with very low-end PC's (plus my 3d modeling skills aren't great so I wouldn't mind hiding it somewhat, haha)

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• Code Signing Services

  - by bogdan

  I'm developing a System Preference Pane that runs a background application. I'm planning on codesigning the background application and I'll be using the kill flag of codesign (http://gemma.apple.com/mac/library/documentation/Darwin/Reference/ManPages/man1/codesign.1.html). From my understanding, this kill flag will not allow the background application to be run if it's signature doesn't match. My problem with this approach is that it doesn't provide any feedback to the user and, for somewhat reason, the application gets corrupted, it will refuse to launch without any information. I'd like to use the Code Signing Service from the System Preference Pane to check the validity of the background application. However, I couldn't find how to use it to check the validity of an external file. Is this possible using the Code Signing Service or should I NSTask codesign directly? My application is targeted for 10.6 so it doesn't matter which I use. Thank you!

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• bjam wih visual studio 2010

  - by ra170

  ok, so I ran into problems with Boost under visual studio 2010, so I decided to rebuild it with bjam: such as: bjam --toolset=msvc-10.0 --build-type=complete After running bjam (successfully?) it created a new directory under boost_1_42_0 called: bin.v2 Inside bin.v2 is directory called: libs. Two issues: 1. there's lot less libs under that new directory (about 13), the old directory libs has 88. Is it supposed to be like that or did something fail? 2. the structure is somewhat different too. What do I do with this exactly? Meaning, do I copy it over to the original libs, delete the old libs, try rebulding it with different flags?

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• systemctl enable differs from systemctl start, how?

  - by rudi_visser

  I am running an Arch Linux (latest, up-to-date) box, and attempting to get MySQL to start at boot. With the systemd package installed I have systemctl available, and as such I can do things like this: systemctl start mysqld.service systemctl [stop|status|restart] mysqld.service That's all fine, and works great when I want to start/stop manually, however, when it comes to getting it to start at boot (by using 'enable' on systemctl, I get some nasty output): [root@rudivarch ~]# systemctl enable mysqld.service Failed to issue method call: No such file or directory Obviously, since the other commands work just fine, I'm seriously confused by this and have spent a good while trying to figure it out... systemctl status outputs this: [root@rudivarch ~]# systemctl status mysqld.service mysqld.service Loaded: loaded (/etc/rc.d/mysqld) Active: inactive (dead) since Tue, 31 Jan 2012 15:32:28 +0000; 1min 25s ago Process: 589 ExecStop=/etc/rc.d/mysqld stop (code=exited, status=0/SUCCESS) Process: 257 ExecStart=/etc/rc.d/mysqld start (code=exited, status=0/SUCCESS) CGroup: name=systemd:/system/mysqld.service Anybody have any ideas as to why 'enable' doesn't work?

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• The speed of .NET in numerical computing

  - by Yin Zhu

  In my experience, .net is 2 to 3 times slower than native code. (I implemented L-BFGS for multivariate optimization). I have traced the ads on stackoverflow to http://www.centerspace.net/products/ the speed is really amazing, the speed is close to native code. How can they do that? They said that: Q. Is NMath "pure" .NET? A. The answer depends somewhat on your definition of "pure .NET". NMath is written in C#, plus a small Managed C++ layer. For better performance of basic linear algebra operations, however, NMath does rely on the native Intel Math Kernel Library (included with NMath). But there are no COM components, no DLLs--just .NET assemblies. Also, all memory allocated in the Managed C++ layer and used by native code is allocated from the managed heap. Can someone explain more to me? Thanks!

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• Which revision of html5lib is stable?

  - by Mat

  html5lib notes that it's latest release (0.11) is somewhat old. Using the Python portion, I have recursion problems as noted in Issue 70 and Issue 59 but can't find a recent Mercurial revision that is stable. The latest tip is no good, I got the following error from python setup.py install: byte-compiling build/bdist.linux-x86_64/egg/html5lib/treewalkers/_base.py to _base.pyc File "build/bdist.linux-x86_64/egg/html5lib/treewalkers/_base.py", line 40 "data": []} ^ SyntaxError: invalid syntax And I get the following errors at runtime: soup = parser.parse(page.read()) File "build/bdist.linux-x86_64/egg/html5lib/html5parser.py", line 165, in parse File "build/bdist.linux-x86_64/egg/html5lib/html5parser.py", line 144, in _parse File "build/bdist.linux-x86_64/egg/html5lib/html5parser.py", line 454, in processDoctype TypeError: insertDoctype() takes exactly 4 arguments (2 given) I'm using it on Python 2.5.2 with lxml and BeautifulSoup.

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• How do ring and bus network connect to router?

  - by lantopology

  Sorry this is probably a very silly question, but for some reason i am confused. How does a LAN with bus or ring topology connect to a router and other LANs? For example in a star network they all connect to a switch which can then connect to a router, but where does a switch go and fit in a bus or ring topology? In this image of a ring network there is no switch: http://www.brainbell.com/tutorials/Networking/images/01fig04.gif would the switch in the ring network simply be placed alongside the other nodes? Thank you very much

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• Django foreign keys cascade deleting and "related_name" parameter (bug?)

  - by Wiseman

  In this topic I found a good way to prevent cascade deleting of relating objects, when it's not neccessary. class Factures(models.Model): idFacture = models.IntegerField(primary_key=True) idLettrage = models.ForeignKey('Lettrage', db_column='idLettrage', null=True, blank=True) class Paiements(models.Model): idPaiement = models.IntegerField(primary_key=True) idLettrage = models.ForeignKey('Lettrage', db_column='idLettrage', null=True, blank=True) class Lettrage(models.Model): idLettrage = models.IntegerField(primary_key=True) def delete(self): """Dettaches factures and paiements from current lettre before deleting""" self.factures_set.clear() self.paiements_set.clear() super(Lettrage, self).delete() But this method seems to fail when we are using ForeignKey field with "related_name" parameter. As it seems to me, "clear()" method works fine and saves the instance of "deassociated" object. But then, while deleting, django uses another memorized copy of this very object and since it's still associated with object we are trying to delete - whooooosh! ...bye-bye to relatives :) Database was arcitectured before me, and in somewhat odd way, so I can't escape these "related_names" in reasonable amount of time. Anybody heard about workaround for such a trouble?

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• MASM Syntax Highlighting in C++ for Visual Studio 2010

  - by Ian Mallett

  So, I had Visual Studio 2010 Ultimate, and everything was great. However, I was confused, thought I wanted MASM, and installed the SDK. This causes strange problems for syntax highlighting. When I'm editing a C/C++ file, for instance, a lot of words (e.g., "data", "add", "sub", "mul", "div", "eax", etc.) are highlighted. At first, I thought I'd just learn to live with it, but it has gotten annoying. I could find nothing online, so, I deleted the MASM folder completely (method of uninstallation), uninstalled Visual Studio, and then installed it again. I firedit up, and the problem persists. Any clues? Thanks, Ian

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• Language in a Sandbox in Rails

  - by Jon Romero

  I've found that there WAS a sandbox gem (created by the guys that made try ruby in your browser but it was compatible only with Ruby 1.8. Another problem is that I cannot find it anymore (it seems they stop serving the gem from the servers...). So, is there any secure way of running ruby in a sandbox (so you can run it from your browser)? Or an easy way to run (for example lua/python) in a sandbox (no filesystem access, no creation of objects etc) and be called from Ruby (Rails 2.2)? I want to make an application like try_ruby even without having a ruby underneath. But it has to be an easy language (I saw there was a prolog in ruby, even a lisp but I don't think they are easy to learn languages...). So, do you have any suggestions or tips? Or should I just start creating my own DSL in Ruby (if there is a solution in creating a somewhat safe system)? Thx

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• Apache2: Trying to map a subdomain to a subdirectory

  - by user1561753

  So basically I want to have: sub.domain.com/anything - domain.com/asub/anything I'm a bit new to this and a bit confused. The first thing I did was configure my DNS settings so sub.domain.com goes to domain.com using a CNAME (would an A record and the IP be better?) Next I went into my VirtualHost file and have: RewriteEngine on RewriteCond %{HTTP_HOST} www.(.+) [NC] RewriteRule ^/(.*) http://domain.com/$1 [R] RewriteCond %{HTTP_HOST} ^sub.domain.com RewriteRule ^/(.*) http://domain.com/asub/$1 [R] So the first rule is meant to handle www. and making sure that is caught correctly and it works. The second rule is what I've added for the subdomain mapping and it doesn't seem to be doing anything

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• How to Obtain Data to Pre-Populate Forms.

  - by Stan

  The objective is to have a form reflect user's defined constraints on a search. At first, I relied entirely upon server-side scripting to achieve this; recently I tried to shift the functionality to JavaScript. On the server side, the search parameters are stored in a ColdFusion struct which makes it particularly convenient to have the data JSON'ed and sent to the client. Then it's just a matter of separately iterating over 'checkable' and text fields to reflect the user's search parameters; jQuery proved to be exceptionally effective in simplifying the workload. One observable difference lies in performance. The second method appeared to be somewhat slower and didn't work in IE8. Evidently, the returned JSON'ed struct was seen as an empty object. I'm sure it can be fixed, though before spending any more time with it, I'm curious to hear how others would approach the task. I'd gladly appreciate any suggestions. --Stan

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• MLS Integration (RETSBond RI or?)

  - by prodigitalson

  I'm looking Specifically for some detailed information on RETSBond Integrator (RI) or something similar. Has anyone used it? Drawbacks? benefits? What I need is something that provides a PHP API out of the box or some kind of RPC exposure. This thing seems to provide an API for batching the MLS server and putting in my own DB which is acceptable although ideally I'd prefer something totally external. Do any MLS services provide that that you are aware of? I realize this is somewhat subjective but I'm looking for a starting point on different services/vendors to research.

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• Import LDIF file to external server

  - by colemanm

  As a follow-up to my previous question, which I've resolved part of, what we're trying to do now is take an exported .ldif file of the "Users" container on our OS X Server and import it into a separate OpenLDAP server on an EC2 instance. This we'll use for LDAP user authentication of other apps without having to open our internal network to LDAP traffic. The exported .ldif file thinks the DN of the "Users" container is cn=users,dc=server,dc=domain,dc=com. Is it easiest to configure the EC2 OpenLDAP server to think that it's domain is the same so the container is imported to the proper place? Or should we edit the text of the .ldif file to change the DN to match the external naming? Hopefully that makes sense... but I'm confused as to the best way to accomplish this.

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• How best to pre-install OR pre-load OR cache Java Script library to optimize performance.

  - by Kabeer

  Hello. I am working for an intranet application. Therefore I have some control on the client machines. The Java Script library I am using is somewhat big in size. I would like to pre-install OR pre-load OR cache the Java Script library on each machine (each browser as well) so that it does not travel for each request. I know that browsers do cache a Java Script library for subsequent requests but I would like the library to be cached once so all subsequent requests, sessions and users. What is the best mechanism to achieve this?

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• seeking to upgrade my bash magic. help decipher this command: bash -s stable

  - by tim

  ok so i'm working through a tutorial to get rvm installed on my mac. the bash command to get rvm via curl is curl -L https://get.rvm.io | bash -s stable i understand the first half's curl command at location rvm.io, and that the result is piped to the subsequent bash command, but i'm not sure what that command is doing. My questions: -s : im always confused about how to refer to these. what type of thing is this: a command line argument? a switch? something else? -s : what is it doing? i have googled for about half an hour but not sure how to refer to it makes it difficult. stable : what is this? tl;dr : help me decipher the command bash -s stable to those answering this post, i aspire to one day be as bash literate as you. until then, opstards such as myself thank you for the help!

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• What is the official installer for Unix packages on Mac OS?

  - by dehmann

  I'm a bit confused about the installation of standard Unix packages on Mac OS X. For example, I have /usr/bin/svn, which is SVN v.1.4.4, but FinkCommander says svn is not installed. The same holds for other packages, like emacs etc. Is that just a wrong FinkCommander setting? Currently it is set to install everything in /sw, which is not even in the PATH. So, do I just have to set it to install packages to /usr, and it will recognize the installed software? I don't want to install duplicate packages of everything, and it is quite weird that the FinkCommander seems not to be in sync with the installed software. Or is there any other installer I should be using? Is Mac Ports the recommended installer to use? (I'm using Mac OS 10.5.8.)

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• My PowerShell functions do not appear to be used

  - by Frank

  Hi there, I have a ps1 script in which I define 2 functions as such: function Invoke-Sql([string]$query) { Invoke-Sqlcmd -ServerInstance $Server -Database $DB -User $User -Password $Password -Query $query } function Get-Queued { Invoke-Sql "Select * From Comment where AwaitsModeration = 1" } I then call the ps1 file by typing it in (it's in a folder in the path, and autocompletion works) However, I cannot start using the functions. I am confused, because when I copy / paste the functions into the console, all is fine and they work. I also have a function defined in my profile, and it works. Where am I thinking wrong, why doesn't it work what I'm trying to do?

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• Should I worry about reigning in namespace number/length/scope?

  - by Jay

  I've recently reorganized a solution-in-progress from 24 projects to 4. To keep the copious files organized in the "main" project, things are in folders in folders in folders. I think I've preserved a logical, discoverable arrangement of the solution content. As a result, of course, I end up with namespaces like AppName.DataAccess.NHibernate.Fluent.Mappings. Is there any compelling reason that I should care about flattening out the namespace hierarchy when my project has a somewhat deeply nested folder structure? (I am not concerned about resolving or managing using directives; I let ReSharper do all the heavy lifting here.)

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