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  • Read only array, deep copy or retrieve copies one by one? (Performance and Memory)

    - by Arthur Wulf White
    In a garbage collection based system, what is the most effective way to handle a read only array if such a structure does not exist natively in the language. Is it better to return a copy of an array or allow other classes to retrieve copies of the objects stored in the array one by one? @JustinSkiles: It is not very broad. It is performance related and can actually be answered specifically for two general cases. You only need very few items: in this situation it's more effective to retrieve copies of the objects one by one. You wish to iterate over 30% or more objects. In this cases it is superior to retrieve all the array at once. This saves on functions calls. Function calls are very expansive when compared to reading directly from an array. A good specific answer could include performance, reading from an array and reading indirectly through a function. It is a simple performance related question.

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  • adress-chunk: separate data stored in one collumn - into three (street, postal-code, town)

    - by zero
    hello dear community. Hello dear friends form all over the planet first of all - this is a great great forum. I like this place to share the ideas. It is so great to see such a supportive place - featuring the knowledge exchange! today i have the following thing to discuss: i want to separate the following data that are stored in one column of a calc-spreadsheet: See the following data: You see that there are the following categories:_ steet, postal-code, town All the data are stored in only one Colum; Well to be honest: i want to separate them into three colums steet, postal-code, town see the data: what can i do? note - you see that there are commas inbetween the enties: and besides this we see that we have a postal-code with four digits: that is a good thing. Perhaps we can use this as a marker that helps us to separate the data?! Perhaps See a data-sample! Here you can see some exceptions: eg. the town that has two words combinde with a "-" ... or somethims without any signs and characters... see the following... as an example: Max-Bader-Platz 1, 5620 Schwarzach im Pongau Pestalozzistraße 4, 9990 Nussdorf-Debant Schulstraße 4, 5162 Obertrum am See But i guess that this means no problem... What do you think about this? I am very very interested to get your opinion! i look forward to hear from you! regards see a snipped of the dataset - that is stored in one column -[b]Goal: [/b]i want to separate the datas into three collumns... : Schulweg 6, 9871 Seeboden Khevenhüllerstraße 45, 4861 Schörfling Franz Xaver Rennstr.18, 6460 Imst Schulstraße 4, 5162 Obertrum am See Schulweg 6, 7432 Oberschützen Pestalozzistraße 4, 9990 Nussdorf-Debant Niederndorf bei Kufstein 53c, 6342 Niederndorf bei Kufstein Hauptschulstraße 18, 2183 Neusiedl an der Zaya Seeweg 14, 5202 Neumarkt am Wallersee Europaplatz 1, 8820 Neumarkt in Steiermark Schulstraße 7, 4212 Neumarkt im Mühlkreis Schulstraße 20, 4720 Neumarkt im Hausruckkreis Bahnhofstr. 10, 4872 Neukirchen an der Vöckla Schulstraße 5b, 4780 Schärding Reitbergstraße 2, 4311 Schwertberg Europaplatz 1, 2320 Schwechat Am Schulberg 5, 3931 Schweiggers Waidach 8, 6130 Schwaz Waidach 8, 6130 Schwaz Max-Bader-Platz 1, 5620 Schwarzach im Pongau Markt 29, 2662 Schwarzau im Gebirge Hofsteigstraße 68, 6858 Schwarzach Gmundner Straße 7, 4690 Schwanenstadt Mühlfeldstraße 1, 4690 Schwanenstadt Mainsdorferstraße 18, 8541 Schwanberg Jakob Stemer-Weg 3, 6780 Schruns Obere Umfahrungsstraße 16, 2432 Schwadorf bei Wien Battloggstraße 54, 6780 Schruns Schloss-Straße 19, 5020 Salzburg Schillerplatz 2, 8280 Fürstenfeld Erzherzog-Johann-Str. 400, 8970 Schladming Schulgasse 261, 8811 Scheifling i look forward to hear from you!! regards

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  • My events don't show up in the goal funnels or conversion funnels

    - by Amit Bens
    I have an event set up on a website and I'd like to track the effect this event has on conversion rate. The event seems to be working fine - I can see it on Top Events with all the labels, etc. But when going into Goal Flow and selecting 'Event Category' these events don't show up. I have this running for about a week. And I have made multiple checks to verify that I have events that triggered the conversion goal. Any clue about what I'm doing wrong?

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  • Firefox, Chrome, and Flash on Ubuntu

    - by Zimmer
    Ok I have recently run into some problems and was hoping you guys could help; 1) On Chrome sometimes when I play a video (even on Youtube) the audio won't work (yet other apps audio will work) but after pressing the play button (pausing and unpausing the video) it finally works but if I pause the video and click play it goes back to not working until I re-do that process. 2) When I go to play videos in firefox or go to grooveshark it says I don't have flash; but I do and when I go to install flash it says I have the LAST version for linux but flash works on Chrome fine (well except the audio problem above which annoys me to no end!)

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  • How to disable Chrome's Incognito Mode?

    - by Jason Tu
    I use this extension called Website Blocker to discourage me from checking Gmail/Reddit. However, it is easy and tempting to open a New Incognito Window; since extensions are disabled in Incognito Mode, I'm still able to browse Gmail/Reddit in this manner. Is there any way to disable Chrome's Incognito Mode in Ubuntu? Ideally, this would encourage me to use my smartphone as a dedicated Gmail/Reddit checker.

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  • Alternatives for comparing data from different databases

    - by Alex
    I have two huge tables on separate databases. One of them has the information of all the SMS that passed through the company's servers while the other one has the information of the actual billing of those SMS. My job is to compare samples of both of these tables (for example, the records between 1 and 2 pm) to see if there are any differences: SMS that were sent but not charged to the user for whatever reason that may be happening. The columns I will be using to compare are the remitent's phone number and the exact date the SMS was sent. An issue here is that dates usually are the same on both sides, but in many cases differ by 1 or 2 seconds. I have, so far, two alternatives to do this: (PL/SQL) Create two tables where i'm going to temporarily store all the records of that 1hour sample. One for each of the main tables. Then, for each distinct phone number, select the time of every SMS sent from that phone from both my temporary tables and start comparing one by one using cursors. In this case, the procedure would be ran on the server where one of the sources is so the contents of the other one would be looked up using a dblink. (sqlplus + c++) Instead of storing the 1hour samples in new tables, output the query to a text file. I will have two text files, one for each source. Then, open the first file and load all of it's content on a hash_map (key-value) using c++, where the key will be the phone number and the value a list of times of SMS sent from that phone. Finally, open the second file, grab each line (in this format: numberX timeX), look for numberX's entry on the hash_map (wich will be a list of times) and then check if timeX is on that list. If it isn't, save it somewhere to finally store it on a "uncharged" table (this would also be the final step on case 1) My main concern is efficiency. These samples have about 2 million records on each source, so just grabbing one record on one side and looking it up on the other would not be possible. That's the reason I wanted to use hash_maps Which do you think is a better option?

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  • Card deck and sparse matrix interview questions

    - by MrDatabase
    I just had a technical phone screen w/ a start-up. Here's the technical questions I was asked ... and my answers. What do think of these answers? Feel free to post better answers :-) Question 1: how would you represent a standard 52 card deck in (basically any language)? How would you shuffle the deck? Answer: use an array containing a "Card" struct or class. Each instance of card has some unique identifier... either it's position in the array or a unique integer member variable in the range [0, 51]. Shuffle the cards by traversing the array once from index zero to index 51. Randomly swap ith card with "another card" (I didn't remember how this shuffle algorithm works exactly). Watch out for using the same probability for each card... that's a gotcha in this algorithm. I mentioned the algorithm is from Programming Pearls. Question 2: how to represent a large sparse matrix? the matrix can be very large... like 1000x1000... but only a relatively small number (~20) of the entries are non-zero. Answer: condense the array into a list of the non-zero entries. for a given entry (i,j) in the array... "map" (i,j) to a single integer k... then use k as a key into a dictionary or hashtable. For the 1000x1000 sparse array map (i,j) to k using something like f(i, j) = i + j * 1001. 1001 is just one plus the maximum of all i and j. I didn't recall exactly how this mapping worked... but the interviewer got the idea (I think). Are these good answers? I'm wondering because after I finished the second question the interviewer said the dreaded "well that's all the questions I have for now." Cheers!

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  • Brasero Burns Data, Not Time - or Piles of Discs

    <b>Linux Insider:</b> "There are a lot of CD/DVD burners for Linux out there, but Brasero stands out as a straightforward, easy-to-use, burner that has some nice extra features but won't make you relearn a lot of complex commands if you only use it occasionally. One nicety is the option to start a burn project and finish it much later, even if you're not using a rewritable disc."

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  • 1. születésnap - új tartalom

    - by Lajos Sárecz
    Kb. 1 éve, június elején kezdtem a blogot írni. Az elmúlt egy év alatt 3395 egyedi látogatója volt a blognak, a látogatók alkalmanként átlagosan 59 másodpercet töltöttek el itt. Azt is el kell ismerni, hogy elég nagy a visszafordulási arány (83,5%), azaz az idetévedok kevesebb mint ötöde találja hasznosnak a tartalmat. Ennek persze lehet egy fontos oka, hogy az IT kifejezésekre keresések miatt külföldiek számára is feljön a keresokben a blogom, így csak megnyitva a blogot észlelik, hogy nem értenek magyarul :-). Jól mutatja az alábbi térkép is, hogy a világ számos pontjáról idetalálnak (van aki egyébként használ valami webes fordító megoldást a nyelvi akadály leküzdésére), de az is látszik hogy a célközönséget is sikerül elérni, azaz a látogatók zöme Magyarországról érkezik (3505 látogatás az összes 5082-bol). Érdekes, hogy a legtöbb látogató a "vb tippjáték" (110 látogató) kifejezésre talált ide, ezt követi az "oracle junior képzés" (42), majd a "kyte" (40) (nem biztos hogy Tom Kyte-ra gondoltak :-)). Csupán a 4. helyen áll az elso igazi IT keresés: "oracle workflow" (37), majd "oracle enterprise manager" (33). A napi csúcslátogatást (76) is a vb tippjátékra keresoknek köszönheti a blog... Az 1. születésnap örömére próbáltam valami újítást csinálni. A fejléc alatt látható új menüsorba próbálom összeszedni azokat a hasznos oldalakat, amelyek kapcsolódnak a blog témájához, ám esetleg nem annyira egyszeru rátalálni a weben. Tervezem még ezt tovább bovíteni, esetleg egy külön oldalt is létrehozni erre a célra a blog mögött. Remélem ezzel segítem a blog olvasók munkáját.

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  • Torque2D, Class vs Datablock

    - by Max Kielland
    I'm scripting my first game with Torque2D and have not fully understood the difference between "Class" and Datablock. To me it seems like Datablock is similar to a struct in C/C++ or a Record in Pascal. If I create Datablocks with new, are they instantiated in the same way as a "Class"? I have a large TileMap and need to attach some information to each Tile. I was thinking to use a Datablock, as a struct, to attach this information to the tile's CustomData property. The two questions are: What is a Datablock and should I use a Datablock or a "Class" for this tile information?

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  • Delete Data From Your Hardrive With DBAN

    This week, I felt the need to re publish an article that my web designer wrote a few years ago. It was written about formatting files from a hard drive to make them unrecoverable. This is very import... [Author: Chris Holgate - Computers and Internet - April 09, 2010]

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  • StreamInsight on the Brain - can you help?

    - by sqlartist
    I just came across this guy who is once again in the news as the world's first cyborg. I read all about this research some years back when he implanted a chip into his arm to allow him to open doors in his research lab. Now, without really advancing the research he is claiming that a virus could be implanted onto these implanted devices. Captain Cyborg sidekick implants virus-infected chip - http://www.theregister.co.uk/2010/05/26/captain_cyborg_cyberfud/ This is of interest to me as I actually...(read more)

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  • AdSense CPM and content topics

    - by Silver Moon
    I run a few blogs on topics like programming, linux tips and network security. I noticed the following: Till last year had only 1 blog that had posts on PHP, linux tips, network security etc. The AdSense RPM was around 1.00. Then I split the content into 3 separate blogs, one focused on web development/PHP/MySQL. second one focused on Linux/Windows how-tos and tips and third one focused on network security and related network topics. The Adsense RPM rose significantly for 2 blogs, and was 1.38 (PHP blog), 0.87 (tech tips blog) and 1.90 (network security blog). In the month of april 2013 the site on network security had the highest traffic and the Adsense income of that site was twice that of all three sites combined previously. My question is simple, does focusing on one topic lead to higher CPC/CPM?

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  • How to import Evolution application data from home folder backup

    - by Wolter Hellmund
    I had many folders and filters and mail in general in Evolution on my previous Ubuntu install, which I thought would be available for me for I had backed up my home directory. I have copied now Evolution related folders to my new home directory, and Evolution is not showing either the folders I had or any of the filters. To be more precise, I have copied the mail folder to ~/.config/evolution/ but that hasn't changed anything, as I said.

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  • Map of the Dead Helps You Plan For a Zombie Apocalypse

    - by Jason Fitzpatrick
    There’s no time like the present to start charting out your zombie apocalypse escape route. Map of the Dead highlights key locations–like gun stores, gas stations, and pharmacies–in your immediate area. The key to surviving the zombie horde is fast access to supplies. Unless you have a bunker under your house filled with goodies, you’ll need more fuel, ammo, and medical supplies–Map of the Dead makes it easy to see where the goods are in your locale. Make sure to mouse over the map key for some entertaining commentary. Map of the Dead [via Neatorama] The Best Free Portable Apps for Your Flash Drive Toolkit How to Own Your Own Website (Even If You Can’t Build One) Pt 3 How to Sync Your Media Across Your Entire House with XBMC

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  • Amazon Web Services Free Trial: query about get and put requests

    - by abel
    Amazon recently introduced a free tier for its cloud offering. I signed up for AWS and while signing up for the free tier of S3, i found this As part of AWS Free Usage Tier, you can get started with Amazon S3 for free. Upon sign-up, new AWS customers receive 5 GB of Amazon S3 storage, 20,000 Get Requests, 2,000 Put Requests, 15GB of bandwidth in and 15GB of bandwidth out each month for one year. source:aws.amazon.com , emphasis mine. 20,000 GET requests & 2000 puts mean , 20,000 page views(max) and 2000 file uploads per month. Isn't that lower than what App Engine offers 43,200,000 requests per day.Am I missing some thing, please help.

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  • Default file manager changed, can't change back

    - by user16171
    (Using ubuntu 11.04) I tried to open a torrent file in chrome, and it asked for my default application, so I clicked Transmission, and then I got an error: "Failed to execute default file manager, Failed to execute child process "transmission" (No such file or directory)." Now if I click on any shortcut on the unity bar, such as the trash folder or the icon for my portable hard drive, I get this error, as well as with any download or folder from chrome or firefox. I can't seem to figure out how to fix this, as there seems to be no easy way to do it.

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  • Direct3d - Code structure

    - by marcg11
    I'm learning directx in a master's degree and they taught us to have a GraphicsLayer class which is the one connecting with the direct3d library. That way this class is completly independent from the other classes (my game classes), meaning changing the renderer to OpenGL wouldn't require much effort but only changing the graphicLayer. This classe has it's LoadAssets, Paint methods, but I have a question, they told us to load all the assets inside this class. This means all these methods will be in the loadAssets method: D3DXCreateTextureFromFileEx(g_pD3DDevice,"tiles.png",0,0,1,0,D3DFMT_UNKNOWN,D3DPOOL_DEFAULT,D3DX_FILTER_NONE,D3DX_FILTER_NONE,NULL,NULL,NULL,&texTiles); // And more resources to load //... texTiles as you see is a LPDIRECT3DTEXTURE9 instance which is declared in the graphicLayer.h. So my question is, how do you manage all the resources? Do I have to declare in the .h all my game textures even if I'm not using them? How would you load only those resources there are in a scene and draw them in a code-strucured way?

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  • Calculate minimum ext3 partition size for certain amount of data

    - by Daniel Beck
    These following ext3 partitions contain identical data. As we can see, the larger the partition size, the more space is required for the same files: Filesystem 1K-blocks Used Available Use% Mounted on /dev/loop11 3965777 561064 3199964 15% [...] /dev/loop19 573029 543843 29186 95% [...] Filesystem Size Used Avail Use% Mounted on /dev/loop11 3.8G 548M 3.1G 15% [...] /dev/loop19 560M 532M 29M 95% [...] Filesystem Inodes IUsed IFree IUse% Mounted on /dev/loop11 1024000 1656 1022344 1% [...] /dev/loop19 1024000 1656 1022344 1% [...] I start with a partition of fixed size that possibly wasted a lot of space and I want to create a partition that is able to hold that data but with (almost) minimal size. How can I reliably calculate that minimal partition size needed for storing a certain amount of data? The amount of data changes over time, and I need to automate these calculations.

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  • How To Get Browser To Open From Same Folder?

    - by Bad Learner
    I don't know how to make the title any more clear. Let me give an example - When I want to add an image to an article on my blog, I click "Browse" button in the image uploader, and then upload the image to the blog. The problem is, when I want to upload another image to my blog, I want the browser to look into the same directory; but it's always takes me to the "Recently Used" directory. Is there a way to change this? I hope I have made myself clear enough. EDIT: I only use Chrome, so I am referring to it.

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