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• How do I choose a database?

  - by liamzebedee

  I need a comparison table of some sort for database varieties (MySQL, SQLite etc.). I can't find one. My use case is, I am implementing storage of objects in a distributed hash table. I need a database solution that is: Fast for sorting Simplistic (no users, preferably no additional structures like multiple tables etc.) Concurrent (if possible) Multi-platform File based (not stored in memory primarily) Centralized I will be programming in Go. As I understand, I believe I need what is called a Document Orientated Database, because I am storing objects, identified by keys. EDIT: While I am implementing a DHT, I will also be storing metadata about the objects, such as access counts etc. It would also be preferable to have TLL (time to live)

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• How to disable Eclipse's behavior of maximizing editor when double clicking a tab?

  - by Steve Kehlet

  I recently updated my Eclipse (now running 20100218-1602), and I've found whenever I click around quickly between tabs on the tab bar, it will sometimes maximize the editor and hide the PHP Explorer to the left. After researching a little, this appears to be a feature of double clicking a tab. So I guess it's my fault, I'm sure I'm clicking around too fast and mistakenly double clicking a tab, but it happens often enough on what I'd consider a normal editing session that I've come to absolutely loathe it, and even after the usual googling due diligence cannot figure out how to turn it off. From this post (http://stackoverflow.com/questions/594659/eclipses-tab-double-click-on-visual-studio) someone mentions the Window.AutoHideAll shortcut, however that seems to only be for assigning keyboard shortcuts--this is a mouse click thing. But maybe it's a clue. I can't find anything relevant under Eclipse - Preferences - PHP. I don't think it's specific to PHP because if I switch to the Java perspective, double clicking a tab hides the Package Explorer. Any suggestions are appreciated, thanks!

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• What's your development setup? (Talking right now to my boss)

  - by Flinkman

  How do I tell my boss, that I need endless cpu power to automate my daily job? By the way, what's your setup, now in sep, 2008. How fast disks? How much memory? How many cores? How big screen? (Ok, what the hell are you doing, you may ask. I'm working in multiple environments, vmware. Have couple of build-systems running, for compatibility tests. These build systems are automated. The setup of the build system is also. Is there an another way?) Thanks!

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• How can I determine the "correct" number of steps in a questionnaire where branching is used?

  - by Mike Kingscott

  I have a potential maths / formula / algorithm question which I would like help on. I've written a questionnaire application in ASP.Net that takes people through a series of pages. I've introduced conditional processing, or branching, so that some pages can be skipped dependent on an answer, e.g. if you're over a certain age, you will skip the page that has Teen Music Choice and go straight to the Golden Oldies page. I wish to display how far along the questionnaire someone is (as a percentage). Let's say I have 10 pages to go through and my first answer takes me straight to page 9. Technically, I'm now 90% of the way through the questionnaire, but the user can think of themselves as being on page 2 of 3: the start page (with the branching question), page 9, then the end page (page 10). How can I show that I'm on 66% and not 90% when I'm on page 9 of 10? For further information, each Page can have a number of questions on that can have one or more conditions on them that will send the user to another page. By default, the next page will be the next one in the collection, but that can be over-ridden (e.g. entire sets of pages can be skipped). Any thoughts? :-s

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• How to recalculate primary index?

  - by JohnM2

  I have table in mysql database with autoincrement PRIMARY KEY. On regular basis rows in this table are being deleted an added. So the result is that value of PK of the latest row is growing very fast, but there is not so much rows in this table. What I want to do is to "recalculate" PK in this way, that the first row has PK = 1, second PK = 2 and so on. There are no external dependencies on PK of this table so it would be "safe". Is there anyway it can be done using only mysql queries/tools? Or I have to do it from my code?

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• Check if a MediaWiki page exists (Python)

  - by compie

  I'm working on a Python script that transforms this: foo bar Into this: [[Component foo]] [[bar]] The script checks (per input line) if the page "Component foo" exists. If it exists then a link to that page is created, if it doesn't exist then a direct link is created. The problem is that I need a quick & cheap way to check if a lot of wiki pages exist.I don't want to (try to) download all the 'Component' pages. I already figured out a fast way to do this by hand: Edit a new wiki page. paste all the 'component' links into the page, press preview, and then save the resulting preview HTML page. The resulting HTML file contains a different link for existing pages than for non-existing pages. So to rephrase my question: How can I save a mediawiki preview page in Python?

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• Realtime processing and callbacks with Python and C++

  - by Doughy

  I need to write code to do some realtime processing that is fairly computationally complex. I would like to create some Python classes to manage all my scripting, and leave the intensive parts of the algorithm coded in C++ so that they can run as fast as possible. I would like to instantiate the objects in Python, and have the C++ algorithms chime back into the script with callbacks in python. Something like: myObject = MyObject() myObject.setCallback(myCallback) myObject.run() def myCallback(val): """Do something with the value passed back to the python script.""" pass Will this be possible? How can I run a callback in python from a loop that is running in a C++ module? Anyone have a link or a tutorial to help me do this correctly?

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• CSV parser in C++

  - by User1

  All I need is a good CSV file parser for C++. At this point it can really just be a comma-delimited parser (ie don't worry about escaping new lines and commas). The main need is a line-by-line parser that will return a vector for the next line each time the method is called. I found this article which looks quite promising: http://www.boost.org/doc/libs/1_35_0/libs/spirit/example/fundamental/list_parser.cpp I've never used Boost's Spirit, but am willing to try it. Is it overkill/bloated or is it fast and efficient? Does anyone have faster algorithms using STL or anything else? Thanks!

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• CSS menu is flickering when scrolling through it with hover effects

  - by kritop

  I hope i described the problem well!? You can see it here: http://dealmob.de/index_dev.html when u hover over the menu up and down fast u see the that its not staying, insteads its flickering like you would change the margins/paddings by few pixels. Any advice on how to solve this problem? thanks a lot like requested: #topcities { float:right; } #topcities li { padding-left:5px; width:100px; } #topcities li:hover { cursor:pointer; color:#000; background: url(images/hover_menue_back.jpg) repeat-x #FFF; -moz-border-radius: 5px; -webkit-border-radius: 5px; border:grey 1px solid; width:100px; }

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• Jquery toggle with two elements

  - by Jesse

  I am using a toggle on a graphic to slide out a contact form. The problem is, the contact form can cover up the graphic element on low resolutions. I thought a solution would be to include a "close this" inside the form, that would use the same toggle effect. When I add the close this element to the code, instead of working in tandem with the original graphic element, it starts the chain back over, and slides the contact form even further out. Site is here: http://www.tritonloyaltysupport.com/status Code for toggle here: $(this).html(div_form); //show / hide function $('div.contactable').toggle( function() { $('#overlay').css({display: 'block'}); $('#contactForm').animate({"marginRight": "-=0px"}, "fast"); $('#contactForm').animate({"marginRight": "+=390px"}, "slow"); }, function() { $('#contactForm').animate({"marginRight": "-=390px"}, "slow"); $('#overlay').css({display: 'none'}); } );

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• Recommend a local LDAP store for development

  - by Paul Stovell

  Our project uses an LDAP repository for storing users. In production this will be Active Directory. For development, we seem to have a couple of options: Install an AD LDS instance that everyone uses Install an AD LDS instance on every developer machine We're trying to keep the 'F5' experience as lightweight as possible, so installing things or relying on a central AD store aren't my favorite ideas. There are other LDAP servers, like Open LDAP. I was hoping there might be an LDAP server that simply talks to an XML file. This would allow us to store the XML file in source control and have something that is fast and works. Our nightly builds would still use AD to pick up any differences, but the hope is since we're using LDAP it should Just Work. Can you recommend an LDAP implementation that works well for zero-config shared-nothing development?

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• live click event of an image is not supported in ie6

  - by Mohan Ram

  I am retriving this content from ajax <div id="content"> click on image to close<img id="img_id"> </div> jQuery code to close div: $("#img_id").live('click',function(){ $("#content").slideUp('fast'); }); Once I click on image div closes. But in IE6 nothing happens. I don't know why IE6 doesn't take live click event, or if the problem is with image id. Once image clicked (live click event not triggered in IE6) What would be the reason?

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• model.matrix() with na.action=NULL?

  - by Vincent

  I have a formula and a data frame, and I want to extract the model.matrix(). However, I need the resulting matrix to include the NAs that were found in the original dataset. If I were to use model.frame() to do this, I would simply pass it na.action=NULL. However, the output I need is of the model.matrix() format. Specifically, I need only the right-hand side variables, I need the output to be a matrix (not a data frame), and I need factors to be converted to a series of dummy variables. I'm sure I could hack something together using loops or something, but I was wondering if anyone could suggest a cleaner and more efficient workaround. Thanks a lot for your time! And here's an example: dat <- data.frame(matrix(rnorm(20),5,4), gl(5,2)) dat[3,5] <- NA names(dat) <- c(letters[1:4], 'fact') ff <- a ~ b + fact # This omits the row with a missing observation on the factor model.matrix(ff, dat) # This keeps the NA, but it gives me a data frame and does not dichotomize the factor model.frame(ff, dat, na.action=NULL) Here is what I would like to obtain: (Intercept) b fact2 fact3 fact4 fact5 1 1 0.7266086 0 0 0 0 2 1 -0.6088697 0 0 0 0 3 NA 0.4643360 NA NA NA NA 4 1 -1.1666248 1 0 0 0 5 1 -0.7577394 0 1 0 0 6 1 0.7266086 0 1 0 0 7 1 -0.6088697 0 0 1 0 8 1 0.4643360 0 0 1 0 9 1 -1.1666248 0 0 0 1 10 1 -0.7577394 0 0 0 1

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• Can NTFS-Search(An OSS project) scan any file on NTFS volume?

  - by Benjamin

  I want to apply NTFS-Search to our project. Our project have to find the files which we specified.(fast and exactly!) But I'm not sure the program(NTFS-Search) works well. What if the file specified is system file? What if the file is being opened by a process with NO_READ_SHARE_MODE? Do you think NTFS-Search can find any files? I don't know about NTFS filesystem well. So I can't find the answer myself. Is there anyone who knows that? I tried to find their email address, but I couldn't find. Thanks in advance.

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• jquery mouseleave issue when moving too slow

  - by David

  Hello. I am using the jQuery mouseenter and mouseleave events to slide a div down and up. Everything works well except for the mouseleave which doesn't appear to fire ONLY if the mouse of moved off of the div quite slowly. If i move the mouse at a relatively normal or fast speed then it works as expected. Can anyone explain this or provide any info on how to get around this? Code: $(document).ready(function() { $('header').mouseenter(function() { $(this).stop().animate({'top' : '25px'}, 500, function() { $(this).delay(600).animate({'top' : '-50px'}, 500); }); }). mouseleave(function(e) { var position = $(this).position(); if (e.pageY > position.top + $(this).height()) { $(this).stop().delay(600).animate({'top' : '-75px'}, 500) ; } }); });

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• PHP to C# and Vice versa

  - by Daniel Sh.

  I'm in this project: A web page that's gonna be used by the front-end company people to query and update data from a SQL DB. I'm working with visual studio and the code behind (C#) is almost done, so the interactions between SQL and C# and ok. My original idea was to work with ASP.NET which is familiar to me, but that's not gonna be possible. I have to switch to PHP. So, today is my first day learning PHP, checking http://php.net/manual/en/index.php and a lot of things seem quite similar to ASP.NET so I guess it won't be that hard. Anyways, some questions popped up quite fast as I wanted to script something else than a "hello world" . Is there an easy way to get/send C# variables from my class using a php page? I've read soemthing about using XML in order to do so, but still I'm scratching my head, is there another, easier, way to do this?

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• Lazy sequence or recur for mathematical power function?

  - by StackedCrooked

  As an exercise I implemented the mathematical power function. Once using recur: (defn power [a n] (let [multiply (fn [x factor i] (if (zero? i) x (recur (* x factor) factor (dec i))))] (multiply a a (dec n)))) And once with lazy-seq: (defn power [a n] (letfn [(multiply [a factor] (lazy-seq (cons a (multiply (* a factor) factor))))] (nth (multiply a a) (dec n)))) Which implementation do you think is superior? I truly have no idea.. (I'd use recur because it's easier to understand.) I read that lazy-seq is fast because is uses internal caching. But I don't see any opportunities for caching in my sample. Am I overlooking something?

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• Optimum php.ini and my.cnf settings for a small Drupal 7 site on a virtual server

  - by the other dude

  I looking for advice on how to set up the default configuration of php.ini and my.cnf for a small site (100 pages) with very little traffic (300 visitors per day). All pages have a bit of text, some images, no video, no audio, no flash/silverlight, very little javascript and jquery. For tracking I'm using GA and Piwik. The main site database is around 50MB. The site is hosted on a virtual server with 20GB RAM and 6 vCPUs so there's hopefully a lot of muscle to make it run very fast. I don't know much about tweaking php and mysql settings and would appreciate it if your answers can be as detailed as possible. Thanks

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• UITableView with contact image problems.

  - by prathumca

  As par my app requirement, I'm showing the contact images in a UITableView as shown below. ABRecordRef contact = [self getContact]; if(contact && ABPersonHasImageData(contact)) { UIImage *contactImage = [UIImage imageWithData:(NSData*)ABPersonCopyImageData(contact)]; callImage.image = contactImage; } I've two problems if I use the above code segment. Table Scrolling is too slow. If comment the above code, then UITable responds very fast. Memory Management. My app started using 25 - 30 MB of RAM. Is there any better way to avoid the above two problems?

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• What is the fastest method to calculate substring

  - by Misha Moroshko

  I have a huge "binary" string, like: 1110 0010 1000 1111 0000 1100 1010 0111.... It's length is 0 modulo 4, and may reach 500,000. I have also a corresponding array: {14, 2, 8, 15, 0, 12, 10, 7, ...} (every number in the array corresponds to 4 bits in the string) Given this string, this array, and a number N, I need to calculate the following substring string.substr(4*N, 4), i.e.: for N=0 the result should be 1110 for N=1 the result should be 0010 I need to perform this task many many times, and my question is what would be the fastest method to calculate this substring ? One method is to calculate the substring straight forward: string.substr(4*N, 4). I'm afraid this one is not efficient for such huge strings. Another method is to use array[N].toString(2) and then wrap the result with zeros if needed. I'm not sure how fast is this. May be you have any other ideas ?

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• VB.Net HTTPWebRequest Speed is slow comparing Python URLOpen

  - by regexhacks

  Hi I am coding a web-crawler which will crawl the websites and selectively parse different sections of a web site. I am a .Net developer so the choice was obvious that I did it in .Net but the speed was very slow which included downloading and parsing of HTMLPages Then I tried to just download the contents first using .Net and then same domains using python but the python was very impressive in downloading data. I have achieved downloading using python but the later part is not that easy to code in python, which obviously i don't want to do. The same batch of domain which took 100 seconds in Python was taking 20 minutes in .Net based crawler I tried http://www.eqlit.com/ to download and in took 8 seconds in Python and same was taking 100 Seconds in .Net crawler Does anyone anyone have any idea why this is slow in .Net but fast in python?

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• Using nsIZipWriter or other to compress a string as a string?

  - by Daniel

  I need to be able to take a javascript string, compress it using any fast and available means and get back a binary string/blob. Background: The extension I'm developing needs to send various large content to my server. It does this conveniently by dynamically creating a form, adding fields to the form and posting it. Some of these fields are just too big bandwidth wise for multiple use. I'd like to be able to compress them before adding them and then maybe base64'ing them if the characters cause a problem in the message. Any ideas? I could use nsiZipWriter with temporary files on disk but that is quite ugly and probably sluggish.

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• which technology is best for a Facebook application Ruby on Rails or C# and ASP?

  - by Johnny

  hi, My friend and I want to write a Facebook application. We've narrowed down the list of possible technologies to Ruby on Rails and C# with ASP. Here are the pros and cons we've thought of. Cons: ASP - proprietary tools like Visual Studio etc. cost (lots of) money. We both don't know ASP (although we're not bad at C#). RoR - It's scripting so might be harder to maintain. My friend doesn't know RoR at all (but he's a fairly proficient programmer so will probably be able to pick it up quickly). Pros: ASP - Facebook has an official SDK for .NET. RoR - I know RoR. It's open source, free and has fast development time. What says the community? Is there something we haven't thought of?

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• Python: need to get energies of charge pairs.

  - by Two786

  I am new to python. I have to make a program for a project that takes a PDB format file as input and returns a list of all the intra-chain and inter-chain charge pairs and their energies (using coulomb’s law assuming a dielectric constant of (?) of 40.0). For simplicity, the charged residues for this program are just Arg (CZ), Lys (NZ), Asp (CG) and Glu (CD) with the charge bearing atoms for each indicated in parentheses. The program should report any attractive or repulsive interactions within 8.0 Å. Here is some additional information needed for the program. Eij = energy of interaction between atoms i and j in kilocalories/mole (kcals/mol) qi = charge for atom i (+1 for Lys or Arg, -1 for Glu or Asp) rij = distance between atoms i and j in angstroms using the distance formula The output should adhere to the following format: First residue : Second residue Distance Energy Lys 10 Chain A: ASP 46 Chain A D= 4.76 ang E= -2.32 kcals/mol (For some reason I can't organize the top two rows, but the first row should be lables and below it the corresponding values.) I really have no idea how to tackle this problem, any and all help is greatly appreciated. I hope this is the right place to ask. Thank you in advance. Using python 2.5

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• PHP speed optimisation.

  - by Petah

  Hi, Im wondering about speed optimization in PHP. I have a series of files that are requested every page load. On average there are 20 files. Each file must be read an parsed if they have changed. And this is excluding that standard files required for a web page (HTML, CSS, images, etc). EG - client requests page - server outputs html, css, images - server outputs dynamic content (20+/- files combined and minified). What would be the best way to serve these files as fast as possible?

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