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  • List of fundamental data structures - what am I missing?

    - by jboxer
    I've been studying my fundamental data structures a bunch recently, trying to make sure I've got them down cold. By "fundamental", I mean the real basic ones. Fancy ones like Red-Black Trees and Bloom Filters are clearly worth knowing, but they're usually either enhancements of fundamental ones (Red-Black Trees are binary search trees with special properties to keep them balanced) or they're only useful in very specific situations (Bloom Filters). So far, I'm "fluent" in the following data structures: Arrays Linked Lists Stacks/Queues Binary Search Trees Heaps/Priority Queues Hash Tables However, I feel like I'm missing something. Are there any fundamental ones that I'm forgetting about? EDIT: Added these after posting the question Strings (suggested by catchmeifyoutry) Sets (suggested by Peter) Graphs (suggested by Nick D and aJ) B-Trees (Suggested by tloach) I'm a little on-the-fence about whether these are too fancy or not, but I think they're different enough from the fundamental structures (and important enough) to be worth studying as fundamental.

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  • What is the point/purpose of Ruby EventMachine, Python Twisted, or JavaScript Node.js?

    - by CCw
    I don't understand what problem these frameworks solve. Are they replacements for a HTTP server like Apache HTTPD, Tomcat, Mongrel, etc? Or are they more? Why might I use them... some real world examples? I've seen endless examples of chat rooms and broadcast services, but don't see how this is any different than, for instance, setting up a Java program to open sockets and dispatch a thread for each request. I think I understand the non-blocking I/O, but I don't understand how that is any different than a multi-threaded web server.

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  • How to control the memory size of continuously running windows service?

    - by Snowill
    Hi, I have created a windows service which is continuously polling a database. For this purpose i have a timer in place. Ever time i am querying a database table i open a connection and close it immediately after my work is done. Right now i am doing this every 20 seconds for testing purpose, but later this time might increase to 5 - 10 minutes. What happens is everytime the database table is polled there is an increase of 10-12 KB in the size of the memory of the service running. This i can see in the task manager. Is there any way to control this.

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  • MSCT Certification, Exam 70-536, your advices?

    - by Philippe
    At the beginning of the year, I was proposed by my company to take some MS certification exams. Since then, they generously paid for the Self-Paced Training Kit book. I was promised to have some time to study, but the project is running late (a habit around here). Let's face it, I'll have to study on my own time to get this certification. Anyway, my question is simple: what advices do you have in order to study effectively? I'm halfway trough the book, and I feel like I don't remember anything. Especially when the questions are so precise on classes name and parameters...

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  • iPhone - finding items in current entity that share related item

    - by Pedro
    G'day Folks My core data driven app has an Events entity, essentially a list of times & venues, with a related Acts entity, the names & bios of the acts appearing at those events. I have a table view that shows the event time & venue (as a table section with 1 row), the act name & act bio that works nicely. If that act is appearing at more than one event I'd like to include another table section that lists those events. I think could get that with event.act.events except that it would include the event I'm currently displaying. Can anyone suggest how to get the data I want & exclude the current record? Cheers & TIA, Pedro :) PS... I have not quite 18 hours until the promised time for a prototype of my app to be available for some testers to download.

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  • Understand ACTV mode and the PORT command

    - by Ramy
    Hello, I'm the part time FTP server administrator (with no real full-time admin). We currently only allow ACTV mode connections. Some of our clients have had issues with this but for the most part they've been ok using ACTV. For the few who aren't, we've been able to push the data over to their servers from ours. there is one client in particular however who is currently having trouble. He is using file-zilla and issuing a PORT command. First, does using the PORT command imply that you are in ACTV mode? Second is there a way in FileZilla to explicitly change to ACTV mode? Thanks for the help, _Ramy

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  • Invoking browser on steaming media URLs

    - by Maven
    I have a dirt simple little function that launches the blackberry browser on a streaming media file in order to launch the built in media player. Everything works fine but there is this annoying dialog every time from the browser asking me if I want to save or open the file. My answer is always "open" the file so is there a way I can make it default and not bring up the dialog each time? The code I'm using to launch the browser // Get the default sessionBrowserSession browserSession = Browser.getDefaultSession(); // now launch the URL browserSession.displayPage(url); This is on blackberry OS 5.0 Thanks!

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  • DLL response is to slow in Visual Studio

    - by magsto
    Hi, I use a 3rd party DLL in my VB.NET project (VS2005) that responds to slow and give wrong values in debug mode. In run-time mode everything works as expected. I do understand that there are something going on in the debug mode which makes the DLL communication slow. This behavior makes it hard to debug the application correctly. Is there any way to force VS to communicate with the DLL in "run-time" mode during debugging but let the rest of the project be in control of the debugger?

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  • gvim "open in new window" should change directory to the one of the current file

    - by Flavius
    Hi I'm working in gvim with sessions and tabs, and everything works great. However there is something that is bothering me. Say I have two files open: /A/B/foo.ext and /C/D/E/bar.ext, the latter being opened last. Now say I want to open /A/B/foobar.ext. I have to go through the hassle of navigating upwards to / and from there to /A/B. I would like to simply change my active tab to /A/B/foo.ext and have gvim automatically change its active directory to /A/B/, so that when I want to open /A/B/foobar.ext with /A/B/foo.ext being active, I'm already in the right CWD. This would be very time-saving if you work with two different projects at a time and need to switch back and forth between the two. Is there any such script that does just that? Thanks.

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  • Solr date field tdate vs date?

    - by user550178
    So I have a question about Solr's field date types which is pretty straight forward: what's the difference between a 'date' field and a 'tdate' one? The schema .xml claims that 'For faster range queries, consider the tdate type' and 'A Trie based date field for faster date range queries and date faceting. ' Fair enough... but what's the precisionStep="6" all about? should i change this? does it change the way i would create the query in case I use the tdate? What's the real advantage or what does Solr do that makes it better? P.S went through google, Solr manual, solr wiki and the java docs without any luck so I'd appreciate a kind and explanatory answer :)... Also checked: http://www.lucidimagination.com/blog/2009/05/13/exploring-lucene-and-solrs-trierange-capabilities/ http://web.archiveorange.com/archive/v/AAfXfqRYyLnDFtskmLRi

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  • ASP.NET forgets dlls in bin directory

    - by Timothy Strimple
    We have a plugin system on a WCF service that checks libraries placed in the bin folder for certain assembly level attributes and loads them. This allows customization of certain service calls based on which client is making the call. This works great most of the time. However, sometimes it seems to lose the dll, which causes the service to revert back to the default implementation for every client. The solution so far has been to just move the dll file out of the bin folder, and back in. This causes asp.net to pick up the file and customizations start working again. I'm at a loss for why the assembly is getting missed like that after a certain amount of time. Any ideas as to what might be causing this?

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  • Query multiple models with one value

    - by swoei
    I have multiple models which all have a FK to the same model. All I know is the FK how can I determine which of the models has the FK attached? Below an example to clearify: class ModelA(models.Model): title = models.CharField("title", max_length=80) class ModelB(models.Model): fk = models.ForeignKey(ModelA) class ModelC(models.Model): fk = models.ForeignKey(ModelA) How can I figure out without using a try/except on each model whether B or C has the FK? (The FK can only be in one of them, for the record in this case I only added two models but in the real world app there are multiple possible x amount of models which have the FK to modelA)

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  • Essential Training Topics for Supervisors of ASP.NET Developers

    - by Dave Johnson
    I have a co-worker who supervises a group of ASP.NET developers who are doing lots of ASP.NET/SQL Server apps. My co-worker was very technical at one time, but his last programming assignment was writing Fortran code in the 1980s. He has asked me to help him gain a deeper knowledge of ASP.NET Web application development to equip him in his supervisory role. I will be spending an hour every other week with him providing training, and he will probably not have a lot of time to commit otherwise. What would you recommend as topics to cover, tutorial resources, etc. so that I can help him get up to speed in his role as a supervisor of ASP.NET developers?

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  • Questions about using git as a backend storage system

    - by XO
    New to git here... I want to commit my personal file share to a git repo (text, docs, images etc). As I make modifications to various files over time, telling git about them along the way, how do go about things so I can: Get out of the business of traditional fulls/incrementals. Be able to do a point-in-time file or full clone restore. Basically, I want something granular, such that, if I make an edit to a file 5 times on a particular day. I will have 5 versions of that file that I can refer back to- forever. Or even just derive the a full copy of everything the way it looked on that particular day. I am currently using rsync for remote incremental syncs (no file versioning).

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  • Testing PayPal certificate on a different domain

    - by PHP thinker
    I have a PP-enabled site that needs to be tested. I've already tested it with Sandbox credentials and it works ok. The next step is to test it with live PayPal credentials on test server. Here I hit a wall, because using real credentials from liveserver.com on test.liveserver.com gives me error of "malformed url" (which as I read stands for "invalid credentials"). And here is the question: are PayPal credentials domain-bound? Can I get error message because I am using live api credentials on a subdomain(different domain)?

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  • Do invisible controls and their children on an ASP.NET page contribute to viewstate?

    - by Mr. Jefferson
    I have an ASP.NET page that has about 40 custom controls embedded in it. The controls vary in size; in their .ascx files, the biggest is about 1,500 lines and the smaller ones are between 100 and 200 lines (markup, script, etc). Each control is contained in a Panel. Only one of these panels is ever visible at any one time, which means only one control is ever visible at one time. My question is this: do the controls that are invisible still send ViewState for themselves and all their children to the client? It makes sense that they might have to serialize the fact that they're invisible, but not all the state info for their children...

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  • Google App Engine PersistenceManager can process multiple objects ?

    - by Frank
    I have some code like this : PersistenceManager pm=PMF.get().getPersistenceManager(); String query="select from "+PayPal_Message.class.getName()+" where processed == false order by time desc"; List<PayPal_Message> messages=(List<PayPal_Message>)pm.newQuery(query).execute(); if (messages.isEmpty()) { } else { for (PayPal_Message g : messages) { Contact_Info_Entry A_Contact_Entry=Process_PayPal_Message_To_Get_A_License(g.getContent().getValue()); pm=PMF.get().getPersistenceManager(); try { pm.makePersistent(A_Contact_Entry); g.setProcessed(true); pm.makePersistent(g); } catch (Exception e) { Send_Email(Email_From,"[email protected]","Servlet Error Message [ "+time+" ]",new Text(e.toString())); } // finally { pm.close(); } } } pm.close(); I wonder if it's ok to use the pm above to process multiple objects before closing it. Or do I have to get and close pm for processing each object ?

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  • User reactions to WYSIWYM

    - by David
    I am trying to decide between a WYSIWYG editor (e.g. TinyMCE, CKEditor) and a WYSIWYM (What You See Is What You Mean) editor (e.g. WMD) for my web application. There is a thread on stackoverflow that compares the two approaches. I would like to know how users, particularly computer novices, have reacted to WYSIWYM editors in deployed web applications. It could be that computer novices are confused by WYSIWYM editors, preferring the immediacy of WYSIWYG; but is that born out in real-world applications? It's not theory I'm asking about here, but empirical evidence of the acceptance or otherwise of WYSIWYM.

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  • showing loading image still shows "browser loading image" icon

    - by ooo
    i have this code running to load my images all asynch and show a ajax loading image until the real image is downloaded. $('img.loadable-image').css('background', 'transparent url(/images/ajax-loader1.gif) no-repeat center center') $('img.loadable-image').load(function() { $(this).css('background', ''); }); this works in that it shows my ajax loading icon until the images is downloaded but it also shows the background as well here is a screenshot of what i get: as you can see on the left, you see the little ajax loader but also see the missing image square around it. any suggestions?

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  • Can PMD be customized to fully support a new language?

    - by tinny
    Can PMD be customized to fully support a new language, in a reasonable amount of time. I mean I know that technically almost anything can be done, but im wondering if this can be done in a reasonable amount of time? E.g. < 2 weeks This page mentions how to write a CPD parser http://pmd.sourceforge.net/cpd-parser-howto.html But is this just for copy / paste detection? Does writing a CPD parser give me full support of PMD in terms of rile sets?

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  • Learning Python coming from PHP

    - by Coronatus
    Community wiki so don't vote to close, kthxbai. My dynamic language experience is solely PHP. I want to learn Python now to broaden my career opportunities and just because I like programming. :) When learning Java, I used a site (lost the URL/real name now), something like "Java for PHP developers" that had all on one side of the page the PHP code, and on the other side the Java code to do the same thing. Is there a website like that for Python? Any other recommendations/advice? Thanks Edit: I have no votes left today, but I'll up-vote good answers tomorrow :)

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  • Using Lucene to Query File properties in Windows

    - by sneha
    Hi All, I am planning to use Apache lucense in one of my projects, I want to index files based on the file properties (I won’t be indexing the data) and I want lucense to query the index so that I can quickly find list of files to based on the properties . E.g: give me all the files with access time greater than 10/10/2005 and access time less than 10/04/2010 and file created by james. Can i use Lucene for these kind of projects ? or i better of using windows search (the foor print is very heavy almost 5 MB :( ) and i have to bundling this as part of my application is seems to tough. Can you please suggest is there any better alternatives here?

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  • Cross-Browser jQuery text-zoom implementation

    - by JMC Creative
    I've got some code to increase/decrease font size. This is giving me a headache because each browser seems to implement the $.css('font-size') differently (see jquery bug). The part that's really killing me, though, is that Firefox is scaling up okay, but when I use the scale down function below, it scales up. Webkit & IE are both working as expected. Any ideas on that? I put this in a fiddle here: http://jsfiddle.net/srQ3P/1/ where you can see it working as expected, and you can see it broken in firefox at the project page: http://cumberlandme.info/residents MAJOR EDIT Sorry, the issue is not the code, it's firefox buggy behavior. After I zoom in or out with the browser controls (ctrl + plus or ctrol + minus) the js goes haywire. This doesn't happen in other browsers. This is the real issue. Any advice on that

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  • ASP.Net: Is it possible to cache the js-proxies generated by scriptmanager?

    - by AndreasKnudsen
    We have the following code: <asp:ScriptManager runat="server"> ... <Services> <asp:ServiceReference Path="~/JSONServices/ProfileService.svc" /> </Services> ... This results in a Javascript proxy found in /JSONServices/ProfileService.svc/js. This Javascript has content expiry set to the same time it was called (so it is never cached on the client). Is it possible to have the clients cache these proxies for some time?

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