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  • Dynamically formatting a string

    - by TofuBeer
    Before I wander off and roll my own I was wondering if anyone knows of a way to do the following sort of thing... Currently I am using MessageFormat to create some strings. I now have the requirement that some of those strings will have a variable number of arguments. For example (current code): MessageFormat.format("{0} OR {1}", array[0], array[1]); Now I need something like: // s will have "1 OR 2 OR 3" String s = format(new int[] { 1, 2, 3 }); and: // s will have "1 OR 2 OR 3 OR 4" String s = format(new int[] { 1, 2, 3, 4 }); There are a couple ways I can think of creating the format string, such as having 1 String per number of arguments (there is a finite number of them so this is practical, but seems bad), or build the string dynamically (there are a lot of them so this could be slow). Any other suggestions?

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  • iPhone SDK Nested For Loop performance

    - by Skeep
    Hi All, I have a NSArray of string id and a NSDictionary of NSDictionary objects. I am currently looping through the string id array to match the id value in the NSDictionary. There are around 200 NSDictionary objects and only 5 or so string ID. My current code is such: for (NSString *Str in aArr) { for (NSDictionary *a in apArr) { if ([a objectForKey:@"id"] == Str) { NSLog(@"Found!"); } } } The performance of the above code is really slow and I was wondering if there is a better way to do this?

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  • Range partition skip check

    - by user289429
    We have large amount of data partitioned on year value using range partition in oracle. We have used range partition but each partition contains data only for one year. When we write a query targeting a specific year, oracle fetches the information from that partition but still checks if the year is what we have specified. Since this year column is not part of the index it fetches the year from table and compares it. We have seen that any time the query goes to fetch table data it is getting too slow. Can we somehow avoid oracle comparing the year values since we for sure know that the partition contains information for only one year.

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  • jQuery Audio Player

    - by tony noriega
    I was given 2 MP3 files, one that is 4.5Mb and one that is 5.6Mb. I was instructed to have them play on a website i am managing. I have found a nice, clean looking CSS based jQuery audio player. My question is, is this the right solution for files that big? I am not sure if the player preloads the file, or streams it ? (if that is the correct terminology) i dont deal much with audio players and such... this player is from happyworm.com/jquery/jplayer/latest/demo-01.htm is there another approach i shoudl take to get this to play properly? I dont want it to have to buffer, and the visitor to wait, or slow page loading...etc..etc.. i want it to play clean and not affect the visitors session to the site. thanks

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  • Most efficient algorithm for mesh-level, optimal occlusion culling?

    - by Fredriku73
    I am new to culling. On a first glance, it seems that most occlusion culling algorithms are object-level, not examining single meshes, which would be practical for game rendering. What I am looking for is an algorithm that culls all meshes within a single object that are occluded for a given viewpoint, with high accuracy. It needs to be at least O(n log n), a naive mesh-by-mesh comparison (O(n^2)) is too slow. I notice that the Blender GUI identifies the occluded meshes for you in real-time, even if you work with large objects of 10,000+ meshes. What algorithm is used there, pray tell?

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  • Alternative databases to use when putting IIS Logs into a database using LogParser

    - by Robin Day
    We have run some scripts that use LogParser to dump our IIS logs into a SQL Server database. We can then query this to get simple stats on hits, usage etc. It's also good when linking it to error log databases and performance counter database to compare usage with errors, etc. Having implemented this for just one system and for the last 2-3 weeks we already have a 5GB database with around 10 million records. This is making any queries to this database quite slow and will no doubt cause storage issues if we continue to log as we are. Can anyone suggest any alternative databases that we could use for this data that would be more efficient for such logs? I'd be particularly interested in any experience of Google's BigTable or Amazon's SimbleDB. Are either of these suitable for reporting queries? COUNTs, GROUP BYs, PIVOTs?

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  • JQuery using cookies

    - by ChrisMJ
    Hi all, in my js file i want to be able to load a "splash screen" in a new air app im developing. At present when i call the splash screen it opens and closes fine, but its when i make it set a cookie it doesnt run at all. Please help... cookieSplash(); function cookieSplash(){ var cookieSplash = $.cookie('loadSplash'); if (cookieSplash == "true") { splash(); }; if (cookieSplash == "false") { loadApplication(); }; } function splash(){ $("#viewport").append('<div id="splash"><img id="splash-close" src="/images/splash-logo.png" alt="click to close"></div>'); $("#splash").click(function() { // Act on the event $("#splash").fadeOut("slow"); $("#jettison").fadeIn("fast"); $.cookie("loadSplash", "false"); }); } function loadApplication(){ $("#jettison").fadeIn("fast"); } Please help me out

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  • How do I get accurev to find a moved workspace?

    - by eric f
    I created a workspace in AccuRev under M:\EclipseWorkspaces\. The project checked out fine. Then I moved the project to C:\EclipseWorkspaces\. Now AccuRev thinks the project does not exists. This is probably because AccuRev is looking for the project on my M drive. How do I get AccuRev to find my project? I am using version 5.3. This computer is slow so I'd like to do this using the CLI. Update: I deleted the workspace in the AccuRev client.... Can I add the workspace on my C drive into my stream in AccuRev?

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  • schema for storing different varchar fields over time?

    - by Henry
    This app I'm working on needs to store some meta data fields about an entity. The problem is that we can already foresee that these fields are going to change a lot in the future. I'm using Hibernate (in ColdFusion) and each entity's properties are translated to one column in the entity table, but altering table columns later down the raod will be costly and error-prone right? Should I go for something like this? MetaDataField ----- metaDataFieldID (PK), name FieldValue ---------- EntityID (PK, FK), metaDataFieldID (PK, FK), value [varchar(255)] Is this common? Anything to watch out for? p.s. I also thought of using XML on SQL Server 05+. After talking to some ppl, seems like it is not a viable solution 'cause it will be too slow for doing certain query for reporting purposes.

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  • Syncing with Address Book: Last modified property in ABPerson/ABRecord

    - by Oliver
    I'm syncing data from the Address Book into a Core Data database and I've nearly got it working perfectly. The only issue remaining is checking for changes and modifications on startup and reflecting the changes inside Core Data. Currently, I simply check the ID of each ABRecord and see if it is already in Core Data. Of course, this only works in the case of new contacts and not changed information inside an existing contact. One solution would be to go through each contact already in the database and check each property against the Address Book. The down side of this is that it's really slow. One method that would work is if the ABRecord had a last modified date. I could then store the date inside the Core Data database and check on startup to see if I need to update the contact. However, I can't find anything like this in the documentation. Any ideas?

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  • Oracle - timed sampling from v$session_longops

    - by FrustratedWithFormsDesigner
    I am trying to track performance on some procedures that run too slow (and seem to keep getting slower). I am using v$session_longops to track how much work has been done, and I have a query (sofar/((v$session_longops.LAST_UPDATE_TIME-v$session_longops.start_time)*24*60*60)) that tells me the rate at which work is being done. What I'd like to be able to do is capture the rate at which work is being done and how it changes over time. Right now, I just re-execute the query manually, and then copy/paste to Excel. Not very optimal, especially when the phone rings or something else happens to interrupt my sampling frequency. Is there a way to have script in SQL*Plus run a query evern n seconds, spool the results to a file, and then continue doing this until the job ends? (Oracle 10g)

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  • How to programmatically fill a database

    - by Dwaine Bailey
    Hi There, I currently have an iPhone app that reads data from an external XML file at start-up, and then writes this data to the database (it only reads/writes data that the user's app has not seen before, though) My concern is that there is going to be a back catalogue of data of several years, and that the first time the user runs the app it will have to read this in and be atrociously slow. Our proposed solution is to include this data "pre-built" into the applications database, so that it doesn't have to load in the archival data on first-load - that is already in the app when they purchase it. My question is whether there is a way to automatically populate this data with data from, say, an XML file or something. The database is in SQLite. I would populate it by hand, but obviously this will take a very long time, so I was just wondering if anybody had a more...programmatic solution...

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  • jQuery show/hide does not work on IE

    - by user1720534
    I have made simple jQuery script that should show div element when hovering mouse over another div (image). Here is my code: jQuery(document).ready(function(){ jQuery("#slider").hover(function(){ jQuery("#slider .hovercontent").fadeTo('fast', 1); },function(){ jQuery('#slider .hovercontent').fadeTo('slow', 0); }); }); Here is url for page: http://asiakas.henripylvas.com/henripylvas/ This works flawless on FF, Chrome, Safari and Opera but when using IE8 or 9 image in #slider div disappear. What is wrong? Tried to search answer for this but no luck. Thanks.

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  • Improving the efficiency of Kinect for Windows DTWGestureRecognition Application

    - by Ray
    Currently I am using the DTWGestureRecognition open source tool for Kinect SDK v1.5. I have recorded a few gestures and use them to navigate through Windows 7. I also have implemented voice control for simple things such as opening PowerPoint, Chrome, etc. My main issue is that the application uses quite a bit of my CPU power which causes it to become slow. During gestures and voice commands, the CPU usage sometimes spikes to 80-90%, which causes the application to be unresponsive for a few seconds. I am running it on a 64 bit Windows 7 machine with an i5 processor and 8 GB of RAM. I was wondering if anyone with any experience using this tool or Kinect in general has made it more efficient and less performance hogging. Right now I removed sections which display the RGB video and the Depth video but even doing that did not make a big impact. Any help is appreciated, thanks!

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  • jQuery: Preventing list scroll?

    - by Legend
    I have this scenario: Using an ajax query I fetch some data items and push them into a ul element as an li element. I use $("ulele").append(new_li_item). I wrote my own custom scroll for this ul element using the following whenever an event is detected: $("ulele").animate({scrollTop: '+=' + 200}, 'slow'); The problem is when I fire that event and the list scrolls due to the animate function above, I want to keep it stable for at least a few seconds. When it scrolls down, elements are still being pushed so the list keeps scrolling no matter what. Is there a way I can pause this from happening without really stopping the activity of pushing elements into the ul list?

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  • Using jQuery to rapidly scroll through a countdown

    - by CaptainAwesomePants
    I have a webpage that displays the number 0, and when the user presses "start", the number should rapidly increasing until it reaches a target number (maybe 10,000 or so) a few seconds later. I'd like the numbers to scroll by as if they're on a slot machine wheel. I've managed to mostly hack something together using the ScrollTo plugin, but it's slow and choppy. It always stops briefly at certain divs along the way. Perhaps I'm using it wrong. Is there a better way to accomplish such an effect?

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  • What is the best algorithm to locate a point in an image file?

    - by suugaku
    Hi all, I want to create a mark sheet recognizer. Here is the description: My system uses black and white color scheme. The mark sheet paper has a small black rectangle on each corner and an additional small black rectangle, to determine orientation, near one of the previous rectangles. The paper is scanned to yield an image (in bmp format for example). The first step is to locate these five references in image as eficient as possible. My rough idea is to trace row by row and from left to right for each row. It sounds very slow I think. Is there any better way to do that? Thank you in advance. regards, Suugaku

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  • Improve responsiveness of $(...).click on touch interface

    - by Bram W.
    I need access to a web-based on screen keyboard which will be used on a touch interface. This example looks nice and functional, however when I try it on an iPad, the responsiveness it very low IMHO. It's not comfortable to use and sometimes whole words are misspelled due to slow response. Is there a way to improve the experience on this type of on screen keyboard? This implementation uses the $('#id').click(...); function to process the events. Is there a better way to achieve the goal of typing on the screen? Are there better plugins out there? Note: The final application will run on different types of devices. For several reasons, native on screen keyboards are no option.

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  • Limit the number of cron jobs runnging a PHP script

    - by ed209
    I have a daily cron job that grabs 10 users at a time and does a bunch of stuff with them. There are 1000's of users that are part of that process every day. I don't want the cron jobs to overlap as they are heavy on server load. They call stuff from various APIs so I have timeouts and slow data fetching to contend with. I've tried using a flag to mark a cron job as running, but it's not reliable enough as some PHP scripts may time out or fail in various ways. Is there a good way to stop a cron job from calling the PHP script multiple times, or controlling the number of times it is called, so there are only 3 instances for example? I'd prefer a solution in the PHP if possible. Any ideas? At the moment I'm storing the flag as a value in a database, is using a lock type file any better as in here http://stackoverflow.com/questions/851872/does-a-cron-job-kill-last-cron-execution ?

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  • Find subset with K elements that are closest to eachother

    - by Nima
    Given an array of integers size N, how can you efficiently find a subset of size K with elements that are closest to each other? Let the closeness for a subset (x1,x2,x3,..xk) be defined as: 2 <= N <= 10^5 2 <= K <= N constraints: Array may contain duplicates and is not guaranteed to be sorted. My brute force solution is very slow for large N, and it doesn't check if there's more than 1 solution: N = input() K = input() assert 2 <= N <= 10**5 assert 2 <= K <= N a = [] for i in xrange(0, N): a.append(input()) a.sort() minimum = sys.maxint startindex = 0 for i in xrange(0,N-K+1): last = i + K tmp = 0 for j in xrange(i, last): for l in xrange(j+1, last): tmp += abs(a[j]-a[l]) if(tmp > minimum): break if(tmp < minimum): minimum = tmp startindex = i #end index = startindex + K? Examples: N = 7 K = 3 array = [10,100,300,200,1000,20,30] result = [10,20,30] N = 10 K = 4 array = [1,2,3,4,10,20,30,40,100,200] result = [1,2,3,4]

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  • Work with a local copy of the "master" SVN repo

    - by Werner
    Hi, at work, we have a SVN repo, which we access to thorugh http, like: svn co http://user@machine/PATH even at work and for some misterious reasons, teh connections between local machines and the repo machine are very slow, but the connection between home and work is almost impossible. I wonder if I could do somethin like: 1- get a copy of the "master" SVN repo to my local machine 2- each time i make modifications etc, use svn co http://user@MYLOCALmachine/PATH instead of svn co http://user@machine/PATH 3- when I am back at work, "merge" somehow all the modifications in my local repo to the master one. Sorry, I am ewally new to SVN, any hint would be appreciated. Thanks

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  • iframe for ad loading good or bad?

    - by Cedar Jensen
    According to Yahoo's "Best Practices for Speeding Up your Site", the pros for using iframes: Helps with slow third-party content like badges and ads Download scripts in parallel but the cons are: Costly even if blank Blocks page onload I want to use an iframe to load ads using the technique mentioned on this site: http://meanderingpassage.com/2007/08/15/keeping-javascript-widgets-from-controlling-your-blog/ Does using this technique mean that as soon as the html contents requested by the iframe are returned to the client, it will load the ad script, potentially blocking the rest of the page's rendering and downloading? Or will the iframe request get processed concurrently while rest of the document is downloaded and rendered?

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  • Deserialized xml - check if has child nodes without knowing specific type

    - by AndyC
    I have deserialized an xml file into a C# object and have an "object" containing a specific node I have selected from this file. I need to check if this node has child nodes. I do not know the specific type of the object at any given time. At the moment I am just re-serializing the object into a string, and loading it into an XmlDocument before checking the HasChildNodes property, however when I have thousands of nodes to check this is extremely resource intensive and slow. Can anyone think of a better way I can check if the object I have contains child nodes? Many thanks :)

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  • What's a reasonable number of rows and tables to be able to join in MySQL?

    - by Philip Brocoum
    I have one table that maps locations to postal codes. For example, New York State has about 2000 postal codes. I have another table that maps mail to the postal codes it was sent to, but this table has about 5 million rows. I want to find all the mail that was sent to New York State, which seems simple enough, but the query is unbelievably slow. I haven't been able to even wait long enough for it to finish. Is the problem that there are 5 million rows? I can't help but think that 5 million shouldn't be such a large number for a computer these days... Oh, and everything is indexed. Is SQL just not designed to handle such large joins?

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  • Unix: millionth number in the serie 2 3 4 6 9 13 19 28 42 63 ... ?

    - by HH
    It takes about minute to achieve 3000 in my comp but I need to know the millionth number in the serie. The definition is recursive so I cannot see any shortcuts except to calculate everything before the millionth number. How can you fast calculate millionth number in the serie? Serie Def n_{i+1} = \floor{ 3/2 * n_{i} } and n_{0}=2. Interestingly, only one site list the serie according to Goolge: this one. Too slow Bash code #!/bin/bash function serie { n=$( echo "3/2*$n" | bc -l | tr '\n' ' ' | sed -e 's@\\@@g' -e 's@ @@g' ); # bc gives \ at very large numbers, sed-tr for it n=$( echo $n/1 | bc ) #DUMMY FLOOR func } n=2 nth=1 while [ true ]; #$nth -lt 500 ]; do serie $n # n gets new value in the function throught global value echo $nth $n nth=$( echo $nth + 1 | bc ) #n++ done

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