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• BFS traversal of directed graph from a given node

  - by p1

  Hi, My understanding of basic BFS traversal for a graph is: BFS { Start from any node . Add it to que. Add it to visited array While(que is not empty) { remove head from queue. Print node; add all unvisited direct subchilds to que; mark them as visited } } However, if we have to traverse a DIRECTED graph from a given node and not all nodes are accessible from the given node [directly or indirectly] how do we use BFS for the same. Can you please explain in this graph as well: a= b = d = e = d a= c = d Here if the starting node is b , we never print a and c. Am I missing something in the algorithm. P.S: I used "HashMap adj = new HashMap();" to create the adjacencey list to store graph Any pointers are greatly appreciated. Thanks.

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• How should I load a xib into a detail view for a split view iPad objective app?

  - by editor

  I've got a split view iPad app with table view in the master pane. After drilling down several levels, each time loading a new .xib, I'd like one of the cells to trigger a web page load in the detail pane. Right now I can only get the web page .xib to load in the master pane side -- which is a master pain in my side. The basic load call where "URLWindow" is a class loaded with initWithNibName: [[self navigationController] pushViewController:URLWindow animated:YES]; I want to do this, but it doesn't seem to work: @interface @property (nonatomic, retain) IBOutlet DetailViewController *detailViewController; ... @implementation [[self detailViewController] pushViewController:URLWindow animated:YES]; How should I be loading the URLWindow .xib into a detail view for a split view detail pane?

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• use multiple views in an application

  - by Gaurav Arora

  Hi All, I am new to Iphone programming. So please don't mind if I ask some basic questions. :mad: I want to develop an application where the landing screen will be a login screen and after login application should display a new screen with the list of available categories. And on selecting any category a new screen should appear with the information related to the selected category. Basically I want to display different screens in the applications and my confusion is how can I make different screens with one .xib file? or should I use different .xib files for each screen. If I use different .xib files for each screen then how should I navigate to different screens. Please help in solving this confusion. Thanks in advance Gaurav

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• How can I easily print multiple layers on multiple pages in Visio

  - by Mark Robinson

  We've created a flow chart using Visio that has multiple layers. (The background is that each layer represents variations on a basic process.) Now we want to be able to print each layer individually. Currently this involves lots of clicking to select the correct layer and and then press print - then repeating this for each of the 10 layers. Is there a simpler way? E.g. define each layer once and use a "print each layer" tool / macro?

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• How to define clock input in Xilinx

  - by seventeen

  Hey, I have almost no experience with Xilinx. I have a group project for a Digital Logic course that is due soon, where my partner, who was supposed to take care of the Xilinx simulations decided to bail on me. So here I am trying to figure it out last minute. I have designed a synchronous counter using a few JK Flip Flops and I need to define the CLK input for the FJKCs. I have drawn up the correct schematic, but I cannot figure out how to define a clock input. Any help appreciated, and yes, this is homework. I just can't find any basic xilinx documentation/tutorials online and I honestly don't have time to learn the whole IDE.

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• How can a Delphi TForm / TPersistent object calculate its own construction and deserialization time?

  - by mjustin

  For performance tests I need a way to measure the time needed for a form to load its definition from the DFM. All existing forms inherit a custom form class. To capture the current time, this base class needs overriden methods as "extension points": start of the deserialization process after the deserialization (can be implemented by overriding the Loaded procedure) the moment just before the execution of the OnFormCreate event So the log for TMyForm.Create(nil) could look like: - 00.000 instance created - 00.010 before deserialization - 01.823 after deserialization - 02.340 before OnFormCreate Which TObject (or TComponent) methods are best suited? Maybe there are other extension points in the form creation process, please feel free to make suggestions. Background: for some of our app forms which have a very basic structure (with some PageControls and QuantumGrids) I realized that it is not database access and other stuff in OnFormShow but the construction which took most of the time (around 2 seconds) which makes me wonder where this time is spent. As a reference object I will also build a mock form which has a similar structure but no code or datamodule connections and measure its creation time.

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• NHibernate IPreUpdateEventListener weird behaviour

  - by mcaaltuntas

  I am using NHibernate 2.0.1 and IPreUpdateEventListener,IPreInsertEventListener events for audit logging purposes. I have a basic entity that has a one to many relation like this. User-------Books From an ASP.NET MVC controller method i am adding a book to a user like this. Book book =new Book("LOTR"); var userBook=user.AddBook(book); After session flushing OnPreInsert event called once for newly created Book object than OnPreUpdate called for all books objects in user's books collection even they have not changed.So I am updating LastMofiedDate property of all books objects and I dont want to do this. Is this supposed behaviour of NHibernate or am I missing something?

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• Microphones not working on Apple macbook Air 1,1 (Early 2008) under Linux

  - by jj_p

  I'm running Linux on an mba. I can't make the microphones (neither external nor internal) work. I test using alsamixer and arecord -d 5 test-mic.waw together with aplay test-mic.waw It seems there is a problem with kernel trying to decipher Apple (intentionally) corrupted 'bios', in particular the mic pins are wrongly assigned. As far as we are concerned here, is there any difference between using EFI and BIOS-compatibility mode? (see https://wiki.archlinux.org/index.php/MacBook where they claim to have everything working out of the box on mba1,1) A nice proposal would be to compile the latest Linux kernel and run hda-jack-retask to find the right configuration (in the case of Realtek codec, the missing things I'm supposed to check are either some vendor-specific COEF verbs, EAPD or GPIO setup.), and then come up with a kernel patch to address the issue. Since I'm not that familiar with this last part of the story, can anyone help me through this process? Some useful data: The output from alsa script run as root http://www.alsa-project.org/db/?f=adae8ebee1007043fe83414ac4972319e02255fa The command hda-jack-sense-test -a (with external mic in) Pin 0x14 (Internal Speaker): present = No Pin 0x15 (Green HP Out): present = Yes Pin 0x16 (Not connected): present = No Pin 0x17 (Not connected): present = No Pin 0x18 (Not connected): present = No Pin 0x19 (Not connected): present = No Pin 0x1a (Not connected): present = No Pin 0x1b (Not connected): present = No Pin 0x1c (Not connected): present = No Pin 0x1d (Not connected): present = No Pin 0x1e (Not connected): present = No Pin 0x1f (Not connected): present = No Most likely the chip is Realtek ALC885 (compare also ALC889A) http://guide-images.ifixit.net/igi/bBTSqaeK5JpQ1AWe.large , although at the moment alsa reads it as ALC889A Takashi Iwai's tutorial https://www.kernel.org/doc/Documentation/sound/alsa/HD-Audio.txt Some people researched the original files from a running OS X installation on this same model (I think the relevant files are AppleHDA.kext/Contents/MacOS/AppleHDA AppleHDA.kext/Contents/PlugIns/AppleHDAHardwareConfigDriver.kext/Contents/Info.p????list AppleHDA.kext/Contents/Resources/layout12.xml.zlib AppleHDA.kext/Contents/Resources/Platforms.xml.zlib) http://www.insanelymac.com/forum/topic/220090-alc889a-pin-configuration/#entry1554954 Datasheet http://www.realtek.info/pdf/ALC885_1-1.pdf (from the same Realtek, one can also try to download Linux driver, but this is just taken from ALSA project, as stated in the readme file.) Compare with this Arch guy http://www.alsa-project.org/db/?f=3ca8243c0626844f0264a3faad0aa72018bc14f4 Here for the first time support to audio (except mics) for mba1,2 (which is morally the same as 1,1) is patched into the kernel http://www.alsa-project.org/pipermail/alsa-devel/2010-February/025511.html The same jack supposedly works both for HP and ext MIC, I think it's called TRRS, and it's the same as the one used e.g. for iphones This guy might have done a similar job, though to a more recent version and for sound globally, not just mics: http://blogs.aerys.in/jeanmarc-leroux/2013/09/15/fixing-2013-macbook-air-ubuntu-sound-issue/ (this is mirror to http://unix.stackexchange.com/questions/73044/microphones-not-working-on-apple-macbook-air-1-1-early-2008-under-linux )

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• Nginx / uWsgi / Django site can handle more traffic with rewrite URL

  - by Ludo

  Hi there. I'm running a Django app, using uWsgi behind Nginx. I've been doing some performance tuning and load testing using ApacheBench and have discovered something unexpected which I wonder if someone could explain for me. In my Nginx config I have a rewrite directive which catches lots of different URL permutations and then forwards them to the canonical URL I wish to use, eg, it traps www.mysite.com/whatever, www.mysite.co.uk/whatever and forwards them all to http://mysite.com/whatever. If I load test against any of the URLs listed with a redirect (ie, NOT the canonical URL which it is eventually forwarded to), it can serve 15000 concurrent connections without breaking a sweat. If I load test against the canonical URL, which the above test I would have expected got forwarded to anyway, it can't handle nearly as much. It will drop about 4000 of the 15000 requests, and can only handle about 9000 reliably. This is the command line I'm using to test: ab -c15000 -n15000 http://www.mysite.com/somepath/ and ab -c15000 -n15000 http://mysite.com/somepath/ I've tried several different types - it makes no different which order I do them in. This doesn't make sense to me - I can understand why the requests involving a redirect may not handle quite so many concurrent connections, but it's happening the other way round. Can anyone explain? I'd really prefer it if the canonical URL was the one which could handle more traffic. I'll post my Nginx config below. Thanks loads for any help! server { server_name www.somesite.com somesite.net www.somesite.net somesite.co.uk www.somesite.co.uk; rewrite ^(.*) http://somesite.com$1 permanent; } server { root /home/django/domains/somesite.com/live/somesite/; server_name somesite.com somesite-live.myserver.somesite.com; access_log /home/django/domains/somesite.com/live/log/nginx.log; location / { uwsgi_pass unix:////tmp/somesite-live.sock; include uwsgi_params; } location /media { try_files $uri $uri/ /index.html; } location /site_media { try_files $uri $uri/ /index.html; } location = /favicon.ico { empty_gif; } }

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• What is technically more advanced: Brainf*ck or Assembler?

  - by el ka es

  I wondered which of these languages is more powerful. With powerful I don't mean the readability, assembler would be naturally the winner here, but something resulting from, for example, the following factors: Which of them is more high-level? (Both aren't really but one has to be more) Who would be the possibly fastest in compiled state? (There is no BF compiler out there as far as I know but it wouldn't be hard writing one I suppose) Which of the both has the better code length/code action ratio? What I mean is If you get to distracted by the, compared to Brainf*ck, improved readability of assembler, just think of writing plain binary/machine code as what assembler assembles to. Both languages are so basic that it should be possible to answer the question(s) in a rather objective view, I hope.

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• What relational database innovations have there been in the last 10 years

  - by Simon Munro

  The SQL implementation of relational databases has been around in their current form for something like 25 years (since System R and Ingres). Even the main (loosely adhered to) standard is ANSI-92 (although there were later updates) is a good 15 years old. What innovations can you think of with SQL based databases in the last ten years or so. I am specifically excluding OLAP, Columnar and other non-relational (or at least non SQL) innovations. I also want to exclude 'application server' type features and bundling (like reporting tools) Although the basic approach has remained fairly static, I can think of: Availability Ability to handle larger sets of data Ease of maintenance and configuration Support for more advanced data types (blob, xml, unicode etc) Any others that you can think of?

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• How can I sandbox Python in pure Python?

  - by Blixt

  I'm developing a web game in pure Python, and want some simple scripting available to allow for more dynamic game content. Game content can be added live by privileged users. It would be nice if the scripting language could be Python. However, it can't run with access to the environment the game runs on since a malicious user could wreak havoc which would be bad. Is it possible to run sandboxed Python in pure Python? If not, are there any open source script interpreters written in pure Python that I could use? The requirements are support for variables, basic conditionals and function calls (not definitions).

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• Shorten array length once element is remove in Java.

  - by lupin

  Note: Following is my homework/assignment, feel free not to answer if you will. I want to delete/remove an element from an String array(Set) basic, I'm not allowed to use Collections..etc. Now I have this: void remove(String newValue) { for ( int i = 0; i < setElements.length; i++) { if ( setElements[i] == newValue ) { setElements[i] = ""; } } } I does what I want as it remove the element from an array but it doesn't shorten the length. The following is the output, basically it remove the element indexed #1. D:\javaprojects>java SetsDemo Enter string element to be added A You entered A Set size is: 5 Member elements on index: 0 A Member elements on index: 1 b Member elements on index: 2 hello Member elements on index: 3 world Member elements on index: 4 six Set size is: 5 Member elements on index: 0 A Member elements on index: 1 Member elements on index: 2 hello Member elements on index: 3 world Member elements on index: 4 six lupin

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• Need to upload files to google docs from my application and store reference to the uploaded file...

  - by Ali

  Hi guys - I'm working on a basic google applications based system. Like I earlier defined I'm building a simple ordering system and to each order placed I attach a file or document. I would like to be able to set it such that whatever file I upload is uploaded into google docs and I somehow am able to maintain a reference to that file from my own application i.e these files are concerned with such and such order. My application is google application based hopefully and I'm building it to be such for later on deployment into the cloud. How do I start on this and what do I need to do? Are there already working widgets I can use and apply or would I need to create my own customised solution for this? I'm working in Php MySQL.

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• MOSS 2007 authentication

  - by Dante

  Hi, I have a MOSS web site configured with Windows Integrated Authentication. I added a couple of local users in the server, added them to Sharepoint groups, and I can log into my site (as long as the local user is part of the administrators group... odd). If I add a domain user to the Owners group, I can't access the site with it. Anybody knows what must be done to open access to domain users in a site configured with Windows Authentication or Basic Authentication? Thanks in advance

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• Matrix inversion in OpenCL

  - by buchtak

  Hi, I am trying to accelerate some computations using OpenCL and part of the algorithm consists of inverting a matrix. Is there any open-source library or freely available code to compute lu factorization (lapack dgetrf and dgetri) of matrix or general inversion written in OpenCL or CUDA? The matrix is real and square but doesn't have any other special properties besides that. So far, I've managed to find only basic blas matrix-vector operations implementations on gpu. The matrix is rather small, only about 60-100 rows and cols, so it could be computed faster on cpu, but it's used kinda in the middle of the algorithm, so I would have to transfer it to host, calculate the inverse, and then transfer the result back on the device where it's then used in much larger computations.

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• WWSAPI and setting "soapenv:Header" values

  - by Ben Burnett

  I'm trying to connect to a web service from a C++ app using WWS. I got the base connection working just fine. My XML message has two parts though, a header (soapenv:Header) and a body (soapenv:Body). the generated functions only fill in the body. How do I set the Header information? I assumed it has something to do with WsSetHeader() or WsAddCustomHeader() but can't seam to find the right values to use in the parameters. Can someone point me in the right direction here? I've been googling and trying to research this now for several days and am finding many sources for basic help with WWSAPI, but nothing seams to go deeper into how to use it for more advanced applications. any good links or resources to find more advanced help on WWSAPI? Thanks, --Ben Burnett www.burnett.ws

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• Good tools which generate NUnit unit tests for .NET assemblies in Visual Studio 2008

  - by andy

  Hey guys, I'm pretty new to Unit Testing so bare with me. I realize that best best practice is not to auto generate unit tests, however I'd like to use Code Generation to set-up the basic skeleton of the tests. Now, I know Visual Studio 2008 already has the built in "create tests", however, it just creates a flat list of all the classes it's going to test... and it's not for NUnit right? Ideally, I'd like the code generation to follow the folder AND namespace structure of the assembly its generating tests for. Can you guys recommend any good tools which generate NUnit unit tests for .NET assemblies in Visual Studio 2008? cheers!

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• mysql, sqlite database source code

  - by Yang

  hi guys, i know implementing database is a huge topic, but i want to have a basic understanding of how database systems works (e.g. memory management, binary tree, transaction, sql parsing, multi-threading, partitions, etc) by investigating the source code of the database, since there are a few already proven very robust open source databases like mysql, sqlite and so on. however, the code are very complicated and i have no clue where to start. also i find that the old school database textbooks are only explaining the theory, not the implementation details. Can anyone suggest how should i get started and is there any books that emphasis on the technology and techniques of building dbms used in modern database industry? Thank in advance!

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• What are Windows code pages?

  - by Mike D

  I'm trying to gain a basic understanding of what is meant by a Windows code page. I kind of get the feeling it's a translation between a given 8 bit value and some 'abstraction' for a given character graphic. I made the following experiment. I created a "" character literal with two versions of the letter u with an umlaut. One created using the ALT 129 (uses code page 437) value and one using the ALT 0252 (uses code page 1252) value. When I examined the literal both characters had the value 252. Is 252 the universal 8 bit abstraction for u with an umlaut? Is it the Unicode value? Aside from keyboard input are there any library routines or system calls that use code pages? For example is there a function to translate a string using a given code table (as above for the ALT 129 value)?

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• Exposing.NET assembly as COM 101

  - by Jan Zich

  I have trouble to expose a .NET assembly in COM. It seems that I must be missing some basic step because I think I followed all tutorials and documentation I found as well as common sense, but still when I do (in a test VBScript): Set o = CreateObject("MyLib.MyClass") It keeps saying that the object cannot be created. Here are the steps I have done: I have simple one method dummy class with no attributes. The class is in a class library which has "Make assembly COM-visible" ticked in Visual Studio. The class library is signed. The DLL is registered via RegAsm.exe with the /codebase parameter (I don’t want / cannot add the DLL to GAC). Just to be sure, I tried to copy the library to the same directory as the test VBScript, but it does not help. Edit: I should have mentioned that the I can instantiate the class in COM if I put the DLL into GAC.

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• SqlPlus on mac osx 10.6 doesn't work

  - by lesce

  When i try to run this #sqlplus system@orcl it gives me this error SQL*Plus: Release 10.1.0.3.0 - Production on Tue Apr 20 02:24:41 2010 Copyright (c) 1982, 2004, Oracle. All rights reserved. Enter password: ERROR: ORA-12154: TNS:could not resolve the connect identifier specified the oracle server is working , I can connect through SQLDeveloper My .profile looks like this export PATH=/opt/local/bin:/opt/local/sbin:$PATH # Setting PATH for Python 3.1 # The orginal version is saved in .profile.pysave PATH="/Library/Frameworks/Python.framework/Versions/3.1/bin:${PATH}" DYLD_LIBRARY_PATH=/Users/lesce/instantclient export TNS_ADMIN=/Users/lesce/instantclient export ORACLE_SID="orcl" export DYLD_LIBRARY_PATH export PATH=$PATH:/Users/lesce/instantclient tnsnames.ora ORCL = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl) ) ) listener.ora SID_LIST_LISTENER = (SID_LIST = (SID_DESC = (SID_NAME = PLSExtProc) (ORACLE_HOME = /Users/oracle/oracle/product/10.2.0/db_1) (PROGRAM = extproc) ) (SID_DESC = (SID_NAME = orcl) (ORACLE_HOME = /Users/oracle/oracle/product/10.2.0/db_1) ) ) LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0)) ) ) My SqlDeveloper configuration username : sys role : sysdba connection type : basic hostname : localhost port : 1521 sid : orcl

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• Ruby on Rails protect_from_forgery best practice

  - by randombits

  I'm currently working on building a RESTful web api with ruby on rails. I haven't bothered putting a proper authentication scheme into the API yet as I'm ensuring that tests and the basic behavior of the API is working all locally first. Upon testing non-HTTP GET type requests such as HTTP POST/DELETE/PUT, stuff chokes because protect_from_forgery is on by default. How does this work when I'm working in practice since essentially the idea is in a RESTful API that there is no state. The client does not have a session or a cookie associated with the server. Each request is an atomic, self-executed request. The user will supply some credentials to ensure they are who they say they are, but other than that, does protect_from_forgery make sense at this point? Should it remain enabled?

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• OpenCL: does it play well with OpenMP, can I connect other languages to it, etc.

  - by Cem Karan

  The 1.0 spec for OpenCL just came out a few days ago (Spec is here) and I've just started to read through it. I want to know if it plays well with other high performance multiprocessing APIs like OpenMP (spec) and I want to know what I should learn. So, here are my basic questions: If I am already using OpenMP, will that break OpenCL or vice-versa? Is OpenCL more powerful than OpenMP? Or are they intended to be complementary? Is there a standard way of connecting an OpenCL program to a standard C99 program (or any other language)? What is it? Does anyone know if anyone is writing an OpenCL book? I'm reading the spec, but I've found books to be more helpful.

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• Good Economics book for developers

  - by Rocket Surgeon

  Joel mentions in several of his blog posts that it is very important for a developer/software entrepreneur to have solid understanding of Economics. Yet the Fog Creek MBA book reading list does not include any Economics books. Is there any good material that people can recommend? Obviously, I am not as concerned about mathematical treatise as foundations and basic principles. For example, I was able to find a very good high-level read on Macroeconomics: Concise Guide to Macroeconomics but I am yet to find anything similar on Microeconomics. Any suggestions and reading pointers would be highly appreciated.

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