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  • I’m new to C++ and unsure about how to improve this code [migrated]

    - by Laian Alsabbagh
    The purpose of the following code is to get a random number of 100 nodes and to distribute these nodes randomly in range 500*500 …(X,Y).. this was the first step #include<iostream> #include <fstream> #include<cmath> using namespace std; int main() { const int x = 0, y = 1; int nodes[100][2]; ofstream myfile; myfile.open ("example.txt"); myfile << "Writing this to a file.\n"; for (int i=0; i<100 ;i++) { nodes[i][x] = rand() % 501; nodes[i][y] = rand() % 501; myfile <<nodes[i][x]<<" "<<nodes[i][y]; } myfile.close(); } now the next step is to improve this code to distribute these nodes in order ( "Imust divide both xy_coordinates as : x= 0-100-200-300-400-500 & y=0-100-200-300-400-500) next is to distribute the nodes (regardless number of nodes) in order range Starting from (0,100 )….(100,100)..(100,200)…….untile i reach the last point (500,500),, ") I’m really confused of how to do it correctly I start to think to define 2 dimensional array , and then to define 2 for loops enter code here Int no_nodes=100; Int XY_coordinate [500][500]; For (int i=0;i<no_nodes; i++) { For (int j=0;j<no_nodes; j++)

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  • Windows 7 doesn't recognize DVD drive

    - by adrianboimvaser
    I reinstalled Windows 7 (x64) because DVD drive stoped being recognized. At first it worked, I even got to burn a dvd. Some time later it misteriously dissapeared again. This question has been asked and answered many times on the Internet, but no proposed solution works for me. Please help! Any clues are gratefuly accepted! EDIT: I booted a live CD and succesfuly tried to burn a DVD. When I rebooted back to windows 7 the DVD drive was there. I burnt another DVD and it also works... I don't know how much it's gonna last... The drive is a TSSTcorp CDDVDW TS-L632H. FW Revision: HS02. It's parallel ATA.

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  • Is it possible to use the same MAC address for an entire subnet?

    - by Bruce
    I wish to add static entries to the ARP table of my machine so that it uses a dummy MAC 00:11:22:33:44:55 for any IP address within the subnet 10.0.0.0/8 Using arp -s 10.0.0.0/8 00:11:22:33:44:55 does not work. What can I do? PS - I know it might sound strange why anyone would want to do this but kindly bear with me here. EDIT: I am using this so that the hosts do not send a broadcast ARP message. I route the packets to the appropriate last hop router which changes the dst MAC from the fake MAC to the MAC of the dst IP address. I can get everything working except I have to manually enter the fake MAC for each subnet IP address.

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  • USB 3.0 Device not detected in Windows 8

    - by Tek
    About my setup: Windows 8 64-bit. X79-UD3 Motherboard. Latest Windows 8 USB 3.0 Drivers from motherboard manufacturer website. All right so device manager detects my USB 3.0 ports, so all is well there. However when I plug in my external USB 3.0 hard drive, windows doesn't even make a beep; the hard drive is not picked up by device manager at all. The SAME thing happens with Ubuntu 12.10 BUT adding PCI=nomsi (as a workaround) to the Grub command line of the Ubuntu boot option makes Ubuntu 12.10 detect my external hard drive. I also have a few other doubts, if you guys would be kind enough to answer them that include: Should XHCI hand-off in the UEFI bios be enabled or disabled for Windows 8? The difference between XHCI hand-off and EHCI hand-off and what are it's effects on USB 3.0 functionality? And last but not least how can I get Windows 8 to recognize my external hard drive when Ubuntu 12.10 (after the Grub workaround) works fine?

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  • Is it possible/likely to be paid fairly without a college degree? [closed]

    - by user20134
    Some back story, and then my question: I took a "break" from getting a university education last year to work full time as back end developer on a GIS application at $10.50 an hour. Later that year I was hired on by a fairly prestigious organization on their GIS application for a meager salary + rockin' benefits (not that I need them). I agreed to work on this project through Summer 2012. I don't feel like I'm being fairly compensated for my time. Other team members make between 3-5 times as much as I do, and their work isn't 3-5 times as good as mine, nor do they have 3-5 times as much output. I don't think this is a rectifiable situation within this institution. They've got a set of personnel charts and the way it gets computed, I make less money than any of the janitors (who are very good, and very nice people to boot, and I'm glad they get paid so well. I wish everyone got livable wages). I'm pretty bright, but school's a drag. I don't want mega bucks, I just want $40k/yr (localized to the southeast united states) so I can save enough money to travel, or maybe "finish [my] education". My question is this: Are people without degrees ever compensated commensurate with other people who have degrees? As a someone who never "finished their education", how badly do you think this as hurt you? How do you navigate the job seeking and hiring process? As someone who hires programmers, do you pay more for diplomas? Is that an institutional necessity, or based on your own value judgement?

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  • Set generic iptables rules?

    - by tftd
    This may be a really dumb question but how can you open a port on multiple interfaces without defining the interfaces? For example how do I open port 22 on all interfaces? On my machine I have some interfaces that are dynamic and may or may not be available so I have to set "generic" rules. This code is not working for me but I can't figure out why: # My default policy is to drop the input. # The other policies are required like that. $IPTABLES -P INPUT DROP $IPTABLES -P OUTPUT ACCEPT $IPTABLES -P FORWARD ACCEPT $IPTABLES -t nat -P POSTROUTING ACCEPT $IPTABLES -t nat -P PREROUTING ACCEPT $IPTABLES -t mangle -P OUTPUT ACCEPT $IPTABLES -t mangle -P PREROUTING ACCEPT #Open port 22 on all interfaces ? $IPTABLES -A INPUT -p tcp --dport 22 -j ACCEPT So apparently there's something wrong with the last line... but I can't see it?

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  • Portable VirtualBox with Ubuntu on two machines

    - by eactor
    I have VirtualBox Portable installed from vbox.me. I moved it on a USB drive and added a virtual Ubuntu. It works fine on the computer I created it, but moving the usb drive to a different the Ubuntu does not start any more. I already changed location descriptions in <machine>.vbox and the VirtualBox.xml. When pressing Shift while starting the GRUB loader comes up, so I tried the recovery mode. Same here – startup freezes and nothing happens. Any hints for me? Last to happen in log file: 00:00:54.986 Display::handleDisplayResize(): uScreenId = 0, pvVRAM=06aac000 w=640 h=480 bpp=32 cbLine=0xA00, flags=0x1 00:01:06.361 Display::handleDisplayResize(): uScreenId = 0, pvVRAM=00000000 w=720 h=400 bpp=0 cbLine=0x0, flags=0x1

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  • Share files and catelog them across a server

    - by Ultan
    Hi all, here is what I am looking for, I use a number of software packages when creating online learning courses. I have a huge number of courses and they use text, audio files, images and video files. I am looking for somthing that I can install on our server and upload the content, index, tag and categorise and enter a description so that when a screen print has to be changed for example I can find all the places that I used the image so that I can go in and change the image without having to check every file that I have created over the last year. An open source solution would be great or something that isn't to expensive. Thank you for any suggestions you can make.

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  • Running a cronjob

    - by Ed01
    've been puzzling over cronjobs for the last few hours. I've read documentation and examples. I understand the basics and concepts, but haven't gotten anything to work. So I would appreciate some help with this total noob dilemma. The ultimate goal is to schedule the execution of a django function every day. Before I get that far, I want to know that I can schedule any old script to run, first once, then on a regular basis. So I want to: 1) Write a simple script (perhaps a bash script) that will allow me to determine that yes, it did indeed run successfully, or that it failed. 2) schedule this script to run at the top of the hour I tried writing a bash script that simple output some text to the terminal: #!/bin/bash echo "The script ran" Then I dropped this into a .txt file MAILTO = *****.******@gmail.com 05 * * * * /home/vadmin/development/test.sh But nothing happened. I'm sure I did many things wrong. Where do I start to fix all of this?

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  • How can we recover/restore lost/overwritten data in our MSSQL 2008 table?

    - by TeTe
    I am in serious trouble and I am seeking professional advices here. We are using MSSQL server 2008. We removed primary key, replaced exiting data with new data resulted losing our critical business data in its child tables on MSSQL Server. It was completely human mistake and we didn't have disk failure. 1) The last backup file was a month ago which means it is useless. 2) We created Maintenance Plans to backup our database at 12AM everyday but those files are nohwere to be found 3) A friend of mine said we can recover from Transaction Logs. When I go to TaskRestore Transaction log is dimmed/disabled. 4) I checked ManagementMaintenance Plans. I can't find any restored point there. It seems that our maintenance plan hasn't been working. Is there any third party tool to recover lost/overwritten data from MSSQL table? Thanks a lot.

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  • How Do I enable Safe Asynchronous Write With NFS?

    - by Joe Swanson
    The NFSv3 documentation talks alot about the concept of "safe asynchronous writes" (last bullet of A1): http://nfs.sourceforge.net/#section_a This is NOT referring to the sync/async option in the server exports file (as the async option in the exports file is NOT safe). As I understand it, safe asynchronous writes is a hybrid between the sync/async exports option. It allows for a server to reply back without flushing to stable storage immediately, but the client will not remove the write request from cache until it has received confirmation that it has been committed to stable storage (and also detects if the server looses power/reboots). I believe that this option is set on the client side, but I have not come across any documentation that shows how to do this. Any ideas?

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  • trying to copy security groups to a user using dsmod group utility in AD

    - by newbie
    i am trying to create a batch file that asks to enter source samid and destination samid. then using dsquery and dsget find out what security groups source samid is assigned to and assign destination samid to those security groups using dsmod. everything works except the dsmod group command. it doesnt do anything and batch file stops. if i literally put "CN=marketing,OU=test group,DC=abc,DC=com" instead of %%g and "CN=test1,OU=test group,DC=abc,DC=com" instead of %dusercn%, it works fine. can anyone help with this? i have pasted my scrip here. this last small thing is killing me. echo off echo %date% at %time% set /p susername=enter source user name: set /P dusername=enter destination user name: echo %susername% echo %dusername% set dusercn= %dusercn%=dsquery user -samid %dusername% echo %dusercn% for /f "tokens=*" %%g in ('dsquery user -samid %susername% ^|dsget user -memberof') do (dsmod group %%g -addmbr %dusercn%) echo completed pause

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  • why Ubuntu 12.04.1 nautilus left panel, doesn't show other partitions and usb drives?

    - by amerllica
    how do you do friends will be fine I had Ubuntu 12.04 and all thing work well but at one day i decide to change my partition tables, and done it. at now I've windows 8, Ubuntu 12.04.1 and Backtrack5 R3 on my laptop. my partitions are: /dev/sda1 * 2048 58597375 29297664 7 HPFS/NTFS/exFAT /dev/sda2 58601472 976773119 459085824 5 Extended /dev/sda5 58605120 797020159 369207520 7 HPFS/NTFS/exFAT /dev/sda6 797030400 933763071 68366336 83 Linux /dev/sda7 933765120 972834815 19534848 83 Linux /dev/sda8 972836864 976773119 1968128 82 Linux swap / Solaris at first I install windows 8 and then Backtrack5 R3, and at last I install Ubuntu 12.04.1 and I realize that my Ubuntu nautilus doesn't show other partitions or usb/cd/dvd drives. I search in Google and various Linux or Ubuntu forums, But I can't find any solution, just one thing... that is "gvfs-gdu-volume" cause nautilus left panel show other partitions which didn't mounted. but when I see top there isn't this program. who can I solve this problem? how nautilus can show other partitions or drives in its left panel once again?

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  • Three Ubuntu 12.04 + Xfce problems

    - by user1708495
    sorry to bother you, but I wanted to set up a minimal Ubuntu 12.04 with minimal Xfce and probably due to my unawareness of several important things, not everything is working properly. -Sometimes when I shutdown I get error message from iwlwifi: It starts with a time out error about sending a power table and after several other errors it says "On demand firmware reload and "Unable to initialize device". And the shutdown stops there so I can only use hard shutdown. -Also when I boot, I often boot to a black screen, but pressing ctrl+alt+f1 gets me to the login prompt (I do not use a login manager). But then I sometimes cannot type. Seems probably more like a X server problem. When it works I only see the Plymouth splash for a very short time or sometimes not at all. -And the last problem is the most annoying one: Frequently Xfce freezes completely. I think ctrl+alt+f1 works sometimes, but other times I also have to use hard shutdown. When it freezes the cpu fan gets louder. I've been using Xbuntu for a while before, but with "real" Linux I am more a beginner, so I hope you forgive my questions Thanks

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  • Ubutu Server Edition: useful for the home user?

    - by D Connors
    My question is simple. What (if anything) does Ubuntu Server Edition have to offer to home users? This question is mostly out of curiosity really, but I like asking. I've got a home network set up here with some 6 to 7 machines (most Windows, one Linux). And I was wondering how useful would it be to have a dedicated computer in my house running Ubuntu Server full time. We've had an awful experience with file sharing so far, would it simplify file sharing/transferring? Would I be able to limit the internet bandwidth granted to each PC? Would I be able to monitor in/out internet traffic (both real time and monthly statistics)? Last, and most important, if I'm completely off as to what Ubuntu Server actually is, please say so. I am completely new to it.

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  • Creating a new PC, need suggestions on parts [closed]

    - by zilentworld
    I want to build a new PC and went around PC Stores to ask for quotations with only some parts that i want and the rest are filled up by them. Here is the "best" i got Core i5 3550 4gb ram ddr3 (planning to get 8,no brand yet) 500gb hdd (no brand yet) GTX550Ti 1g DDR5 Asus P8H61 ATX Casing Here is what i have from my last PC: Huntkey green power 500w Hyper TX3 Evo I want a dual monitor pc which will be used mostly for gaming,programming and i do a lot of multitasking. Im not planning YET to OC my cpu but i will in the near future. So can i ask for suggestions on what to change on my list? my budget is about 800$ (including 2nd monitor)

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  • Realtime website slowness (PHP/MYSQL)

    - by 3s2ng
    We got a website with realtime transactions. The past few days we experienced some slowness during a period of time. Usually the slowness last for 5 minutes. And also during the slowness we noticed that sometimes we can not connect to SSH and FTP or sometimes very slow to connect to those services. Currently we are trying to identify the issue. We already setup database monitoring tool. Now are about to signup with pingdom.com My question is. If the website is too slow due to the database (table or row lock) will it affect the other services like SSH and FTP? Does the ping correlates the page load and the connection between my PC and server? Thanks, Mark

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  • what may cause unexpected log outs?

    - by lalebarde
    Sometimes, my Linux PC unexpectedly closes my session (log out) while I am working, and puts me back the login window. If I have terminal 1 logged with root and 2 logged with another user (without X), these ones are not logged out. For example, for the last three hours, it has happened five times. Other times, it leads to a reboot. So I have investigated: the UPS, but the behaviour is unchanged without it). the temperatures, but everything is fine (cpu, disks, video card). I have started to investigate also: the memory (partially tested - I have to run a full testyt next night). EDIT: totally tested and passed. My configuration is: Linux 2.6.37-tuxonice x86_64 Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz. Any idea please?

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  • Unable to access my gmail after moving to another country

    - by Gilgamesh
    I am completely fed up with google's useless security policy for emails. I hope there is any method to solve this. What is happenibg is that I used to use my gmail account from Turkey and recently I had to move to Sweden. When trying to gain access to the same account from there, google tells me that 'something has changed'since my last access and it is asking that I verify myself using methods that I forgot them all because I created that account two years ago when I had a different phone number and email and when I did not care much to answer the'secret' question. I also tried google's incompetent recovery survey that judged that I did not provide sufficient information for them to give me access again. Is there any way to solve this,please help. I desperately need to access that account. Thanks

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  • Include new rows in autofilter range

    - by user9645
    I am working with an excel 2007 worksheet that has the "filter" applied so that each column heading has a pull-down menu for sorting. When I add new rows to the end of the table by cut-n-paste from the last row, these new rows are not included in the sorting. I can't seem to get the newly added rows to be included in the filter range. I tried un-selecting and re-selecting the "filter" button and also tried the "reapply" button. The "clear" button is always greyed out. I can't seem to find any relevant help for this online anywhere. Not sure if it matters, but the heading row and the first column are set to be "sticky" (they don't scroll with the rest of the table.)

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  • Problem installing Ubuntu 14.04 into a laptop using Windows 8.1

    - by AlexanderFreud
    I have used Ubuntu on my LG laptop for several years. I lately bought an Acer Aspire V5 laptop which included Windows 8.1. I don't have any data on it; I would like to just remove it completely (that horrible Windows 8.1) and install Ubuntu. I tried using a USB device with Ubuntu 14.04 (64bit version) saved on it. I changed the BIOS configuration, putting USB device first on boot order, Windows Boot Manager last. When I try to run with USB device it doesn't work. Messages like these show up: System doesn't have any USB boot option. Please select other boot option in Boot Manager Menu. Windows failed to start. A recent hardware or software change might be the cause. To fix the problem: 1. insert your windows installation disc and restart your computer 2. choose your language settings, and then click "next" 3. click "repair your computer" If you do not have this disk, contact your system administrator manufacturer for assistance File \ubuntu\winboot\wubildr.mbr Status: 0xc000007b Info: the application or operating system couldn't be load...[?] required file is missing or contains errors. Could someone please write step-by-step procedures to install Ubuntu 14.04 after removing Windows 8.1 ? I already have done a second partition on the hard disk just in case.

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  • Excel macro to delete empty rows isn't stopping

    - by RocketGoal
    How do I make it stop after a certain amount of rows? I've taken a VBA course and my teacher explained how to delete empty rows. I'm now trying to put this in place but my macro isn't stopping. I thought I had limited it to 200 rows. I'm missing something important. Any pointers much appreciated. Sub RemoveRows() ' Remove rows from last blank cell Dim LastRow As Long Dim ISEmpty As Long 'Count how many records in the list. This is done so that the Do loop has a finish point. LastRow = Range("A200").End(xlUp).Row 'Start at the top of the list Range("A1").Select 'Loop until the end of the list Do While ActiveCell.Row < LastRow 'Assign number of non empty cells in the row ISEmpty = Application.CountA(ActiveCell.EntireRow) 'If ISEmpty = 0 then delete the row, if not move down a cell into the next row If ISEmpty = 0 Then ActiveCell.EntireRow.Delete Else ActiveCell.Offset(1, 0).Select End If Loop End Sub

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  • Unable to debug javascript?

    - by linkme69
    I’m having some problems debugging an encoded javacscript. This script I’m referring to given in this link over here. The encoding here is simple and it works by shifting the unicodes values to whatever Codekey was use during encoding. The code that does the decoding is given here in plain English below:- <script language="javascript"> function dF(s){ var s1=unescape(s.substr(0,s.length-1)); var t=''; for(i=0;i<s1.length;i++)t+=String.fromCharCode(s1.charCodeAt(i)-s.substr(s.length-1,1)); document.write(unescape(t)); } I’m interested in knowing or understanding the values (e.g s1,t). Like for example when the value of i=0 what values would the following attributes / method would hold s1.charCodeAt(i) and s.substr(s.length-1,1) The reason I’m doing this is to understand as to how a CodeKey function really works. I don’t see anything in the code above which tells it to decode on the basis of codekey value. The only thing I can point in the encoding text is the last character which is set to 1 , 2 ,3 or 4 depending upon the codekey selected during encoding process. One can verify using the link I have given above. However, to debug, I’m using firebug addon with the script running as localhost on my wamp server. I’m able to put a breakpoint on the js using firebug but I’m unable to retrieve any of the user defined parameters or functions I mentioned above. I want to know under this context what would be best way to debug this encoded js.

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  • Computer won't stay powered up

    - by Android
    I have just tried to turn my PC on this morning and it won't stay powered up. It will come on as normal for about 5 seconds, not quite long enough for the monitor to wake up. Then it will power off. After about 2 seconds it will start again, it will continue like this until I pull out the plug. Plugging it in again doesn't restart the cycle although pressing the power button does. I have tried to clear the cmos but beyond that I have no ideas. It was working perfectly when I put it in hibernate last night. NOTE: I am using a Dell Optiplex 755 UPDATE 1: I took out the motherboard battery and it almost came on then it displays the message Error loading Operating System UPDATE 2: After taking out the custom video card, it says "No hard drive present"

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  • Sprite batching seems slow

    - by Dekowta
    I have implemented a sprite batching system in OpenGL which will batch sprites based on their texture. How ever when I'm rendering ~5000 sprites all using the same texture i'm getting roughly 30fps. The process is as followed create sprite batch which also create a VBO with a set size and also creates the shaders as well call begin and initialise the render mode (at the moment just setting alpha on) call Draw with a sprite. This checks to see if the texture of the sprite has already been loaded and if so it just creates a pointer to the batch item and adds the new sprite coords. If not then it creates a new batch item and adds the sprite coords to that; it adds the batch item to the main batch. if the max sprite count is reached render will be called call end which calls render to render the left over sprites in the batch. and also resets the buffer offset render loops through each item in the batch and will bind the texture of the batch item, map the data to the buffer and then draw the array. the buffer will then be offset by the amount of sprites drawn. I have a feeling that it could be the method i'm using to store the batched sprites or it could be something else that i'm missing but I still can work it out. the cpp and h files are as followed http://pastebin.com/ZAytErGB http://pastebin.com/iCB608tA On top of this i'm also getting a weird issue where then two sprites are batched on after the other the second sprite will use the same coordinates as the last. And then when one if drawn after it is fine. I can't seem to find what is causing this issue. any help would be appreciated iv been sat trying to work this all out for a while now and cant seems to put my finger on what's causing it all.

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