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• Implementing a hilbert map of the internet

  - by Martin

  In the XKCD comic 195 a design for a map of the internet address space is suggested using a hilbert curve so that items from a similar IPs will be clustered together. Given an IP address, how would I calculate the 2D coordinates (in the range zero to one) that this IP is located on such a map?

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• Seprating binary encryption data

  - by lnk1347

  Does a binary encrypted string could contain a 'space' or 'carriage return'? What's the best way to put a separator between two encrypted byte[] arrays?

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• Dynamic memory managment under Linux

  - by petersohn

  I know that under Windows, there are API functions like global_alloc() and such, which allocate memory, and return a handle, then this handle can be locked and a pointer returned, then unlocked again. When unlocked, the system can move this piece of memory around when it runs low on space, optimising memory usage. My question is that is there something similar under Linux, and if not, how does Linux optimize its memory usage?

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• writing to an ioport resulting in segfaults...

  - by Sniperchild

  I'm writing for an atmel at91sam9260 arm 9 cored single board computer [glomation gesbc9260] Using request_mem_region(0xFFFFFC00,0x100,"name"); //port range runs from fc00 to fcff that works fine and shows up in /proc/iomem then i try to write to the last bit of the port at fc20 with writel(0x1, 0xFFFFFC20); and i segfault...specifically "unable to handle kernel paging request at virtual address fffffc20. I'm of the mind that i'm not allocating the right memory space... any helpful insight would be great...

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• Getting line by line in Apple Script from Address Books Note Field

  - by Axwack

  I have two lines in my address book's note field Test 1 Test 2 I would like to get each line as a separate value or get the last line from the notes field. I tried doing it this way: tell application "Address Book" set AppleScript's text item delimiters to "space" get the note of person in group "Test Group" end tell but the result is {"Test 1 Test 2"} I'm looking for : {"Test1","Test2"} What am I doing incorrect?

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• (C) how does a heap allocator handle a 4-byte block header, while only returning addresses that are

  - by hatorade

  It doesn't seem to make sense, unless we just ignore any potential excess space at the beginning of a segment, and then have the first allocated chunk be at the first multiple of 8 (with its corresponding first header being that address -4). This would leave however many bytes before that unused. Is that what's generally done?

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• Given a 1TB data set on disk with around 1KB per data record, how can I find duplicates using 512MB

  - by user288609

  There is 1TB data on a disk with around 1KB per data record. How to find duplicates using 512MB RAM and infinite disk space?

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• What's the best way to draw a fullscreen quad in OpenGL 3.2?

  - by Phineas

  I'm doing ray casting in the fragment shader. I can think of a couple ways to draw a fullscreen quad for this purpose. Either draw a quad in clip space with the projection matrix set to the identity matrix, or use the geometry shader to turn a point into a triangle strip. The former uses immediate mode, deprecated in OpenGL 3.2. The latter I use out of novelty, but it still uses immediate mode to draw a point.

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• Using CreateOrthographicOffCenter in XNA

  - by Jeffrey Kern

  I'm trying to figure out how to draw graphics in XNA, and someone else suggested this. But before I attempt to use this... If I create and use this camera, and set LEFT,TOP to 0 and WIDTH=256 and HEIGHT=240, anything I render to the screen will use these coordinates? So a box with a width and height of 1, if set to 0,0 will take up space from 0,0 to 1,1?

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• How does the garbage collector determine whether an object is garbage?

  - by n0vic3c0d3r

  How does the garbage collector determine whether an object is garbage? Does it refer to the stack to check the references to the space allocated in the heap?

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• Memory randomization as application security enhancement?

  - by Paul Sasik

  I recently came upon a Microsoft article that touted new "defensive enhancements" of Windows 7. Specifically: Address space layout randomization (ASLR) Heap randomization Stack randomization The article went on to say that "...some of these defenses are in the core operating system, and the Microsoft Visual C++ compiler offers others" but didn't explain how these strategies would actually increase security. Anyone know why memory randomization increases security, if at all? Do other platforms and compilers employ similar strategies?

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• "Tab" disappear when adding new ListViewItem to ListView

  - by user340169

  Hi i am trying to add string to Listview the string contain Tab (or \t) character. when i do this the Tab disappear. code: string text = "test Tab";// The space between the words is "Tab" of course this.listView1.Items.Add(new ListViewItem(text)); why is this happens?

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• Read files via php

  - by Koka

  You all know about restrictions that exist in shared environment, so with that in mind, please suggest me a php function or something with the help of which I could stream my videos and other files. I have a lot of videos on the server, unlimited bandwidth and disk space, but I am limited in ram and cpu.

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• How to turn string into readable by php server way? (ActionScript)

  - by Ole Jak

  So I know that my server on real form submit turns %CE%EB%E5%E3+%DF%EA%F3%F8%EA%E8%ED into ???? ??????? . How to peform string transfer from ???? ??????? into %CE%EB%E5%E3+%DF%EA%F3%F8%EA%E8%ED using ActionScript? (Its ok if a space character as %20, not + , PHP should handle that fine.)

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• min-height or sticky footer which is preferred idea?

  - by metal-gear-solid

  If in content is too small in pages then it look odd . to show some space to make looks good which method would be better. min-height to #main-content or sticky footer, which is preferred idea?

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• Reading data from text file in C

  - by themake

  I have a text file which contains words separated by space. I want to take each word from the file and store it. So i have opened the file but am unsure how to assign the word to a char. FILE *fp; fp = fopen("file.txt", "r"); //then i want char one = the first word in the file char two = the second word in the file

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• Cutomizing dired

  - by Arthur Debert

  I just came across this dired mode screen at Wikipedia. I am looking into those customizations. Regarding colors, I guess just specifying the correct faces will do, but how do I get dired to show file sized in kbytes by default? And the available space in MBs (top line)?

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• Does the number of rows in mysql table matter?

  - by 1s2a3n4j5e6e7v

  I'm coming up with a web app which will want me to store more than 80 Lakh (8 million) rows. Will it be fine to handle those many number of rows with MySQL without having any performance degradation? Assume my RAM to be 4 GB and Infinity GB Harddisk space. Also, the main fields have been indexed.

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• reading a text file in java

  - by aks

  I want to read a text file containing a space sepearted vlaues.Values are integers. How can i read it and put it in a array list?? eg of contents of texx file 1 62 4 55 5 6 77 now i want a arraylist as [1, 62,4,55,5,6,77]. How do i do it in java?

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• delete the 'target' directory after build

  - by pstanton

  hi, i know this is probably frowned upon by maven lovers, but the whole 'target' directory is a waste of space in the context of our program and it's deployment. we have other build processes responsible for creating the actual deployment and i currently manually delete the target dir after every maven build, so that its contents don't interfere with my file searches etc... is there a way to delete this dir automatically at the end of a maven build/install? thanks, p.

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• Formatting equations in LaTeX

  - by jetsam

  When I include an equation in LaTeX that is enumerated, i.e. {\begin{equation} $$ $$ ... \end{equation} } The line above the equation (blank space between the text preceeding it and the equation) is huge. How do I make it smaller?

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• Database maintenance, big binary table optimization

  - by jgemedina

  Hi i have a huge database, around 1 TB in size, most of the space is consumed by a table which stores images, the tables has right now almost 800k rows. server response time has increased, i would like to know which techniques should i use or you recomend, partitioning? o how to reorganize the table every row is accessed by the image id column, and it has its clustered index by that column, and every two days i reorganize the index and every 7 days i rebuild it, but it seems not to be working any suggestions?

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• What are possible causes of IDirect3DVertexBuffer9::Lock failing?

  - by Suma

  In error reports from some I have quite often seen following behaviour: IDirect3DVertexBuffer9::Lock fails, returned error code is D3DERR_NOTAVAILABLE. Once this happens, quite frequently (but not always) it is followed by CreateTexture or CreateVertexBuffer failing with error D3DERR_OUTOFVIDEOMEMORY. What are possible reasons for vertex buffer lock failure? Could virtual memory address space exhausted, or what?

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• Please help on multiple match replacement

  - by duenguyen

  I have a perl code: my $s = "The+quick+brown+fox+jumps+over+the+lazy+dog+that+is+my+dog"; what I want is to replace every + with space and dog with cat i have this regular expression $s =~ s/+(.*)dog/ ${1}cat/g; But it only match first occurrence of + and last dog. Please help

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• Eclipse: Java Enum auto-completion of switch case

  - by Maroloccio

  Is there a CTRL+space -like way of "auto-constructing" a switch case around a given Java Enum in Eclipse? I'd like a stub with all Enum cases...

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