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  • Problem with reformatting Sandisk read-only USB drive

    - by dimas
    Hi everyone I have a problem reformatting my USB drive. Its showing this error message whenever I tried to reformat it using gparted: Parted 0.11.0 --enable-libparted-dmraid Libparted 2.3 Format /dev/sdb1 as ntfs 00:00:01 ( ERROR ) calibrate /dev/sdb1 00:00:01 ( SUCCESS ) path: /dev/sdb1 start: 22,768 end: 31,248,383 size: 31,225,616 (14.89 GiB) set partition type on /dev/sdb1 00:00:00 ( ERROR ) libparted messages ( INFO ) Unable to open /dev/sdb read-write (Read-only file system). /dev/sdb has been opened read-only. Unable to open /dev/sdb read-write (Read-only file system). /dev/sdb has been opened read-only. Unable to open /dev/sdb read-write (Read-only file system). /dev/sdb has been opened read-only. Unable to open /dev/sdb read-write (Read-only file system). /dev/sdb has been opened read-only. Unable to open /dev/sdb read-write (Read-only file system). /dev/sdb has been opened read-only. Unable to open /dev/sdb read-write (Read-only file system). /dev/sdb has been opened read-only. Unable to open /dev/sdb read-write (Read-only file system). /dev/sdb has been opened read-only. Unable to open /dev/sdb read-write (Read-only file system). /dev/sdb has been opened read-only. Can't write to /dev/sdb, because it is opened read-only. Unable to open /dev/sdb read-write (Read-only file system). /dev/sdb has been opened read-only. Reason I wanted to reformat it is because it just suddenly stopped working when I was transferring files from my pc and also it erased every content that was saved in the usb drive. I tried various tutorials on the net regarding this however I can't find a solution on how to make a usb drive change its read-only property to read-write or anything that would enable me to reformat this usb drive. I have also checked this link format read-only USB drive but this one doesn't have a solution. Also am attempting to do this on Ubuntu 12.04.

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  • C++ Pointers: Number of levels of Indirection

    - by A B
    In a C++ program that doesn't contain legacy C code, is there a guideline regarding the maximum number of levels of indirection that should be used in the source code? I know that in C (as opposed to C++), some programmers have used pointers to pointers for a multiple dimension array, but for the case of arrays, there are data structures in C++ that can be used to avoid the pointers to pointers. Are users who still create pointers to pointers (or more than this) trying to use pointers to pointers only for performance ETC. reasons? I have tried NOT to use any more than a pointer to a pointer, only in the case that a pointer needed modification; does anyone have any other official or unofficial guidelines or rules regarding the number of levels of indirection?

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  • Mathemagics - 3 consecutive number

    - by PointsToShare
    © 2011 By: Dov Trietsch. All rights reserved Three Consecutive numbers When I was young and handsome (OK, OK, just young), my father used to challenge us with riddles and tricks involving Logic, Math and general knowledge. Most of the time, at least after reaching the ripe age of 10, I would see thru his tricks in no time. This one is a bit more subtle. I had to think about it for close to an hour and then when I had the ‘AHA!’ effect, I could not understand why it had taken me so long. So here it is. You select a volunteer from the audience (or a shill, but that would be cheating!) and ask him to select three consecutive numbers, all of them 1 or 2 digits. So {1, 2, 3} would be good, albeit trivial set, as would {8, 9, 10} or {97, 98, 99} but not {99, 99, 100} (why?!). Now, using a calculator – and these days almost every phone has a built in calculator – he is to perform these steps: 1.      Select a single digit 2.      Multiply it by 3 and write it down 3.      Add the 3 consecutive numbers 4.      Add the number from step 2 5.      Multiply the sum by 67 6.      Now tell me the last 2 digits of the result and also the number you wrote down in step 2 I will tell you which numbers you selected. How do I do this? I’ll give you the mechanical answer, but because I like you to have the pleasure of an ‘AHA!’ effect, I will not really explain the ‘why’. So let’s you selected 30, 31, and 32 and also that your 3 multiple was 24, so here is what you get 30 + 31 + 32 = 93 93 + 24 = 117 117 x 67 = 7839, last 2 digits are 39, so you say “the last 2 digits are 39, and the other number is 24.” Now, I divide 24 by 3 getting 8. I subtract 8 from 39 and get 31. I then subtract 1 from this getting 30, and say: “You selected 30, 31, and 32.” This is the ‘how’. I leave the ‘why’ to you! That’s all folks! PS do you really want to know why? Post a feedback below. When 11 people or more will have asked for it, I’ll add a link to the full explanation.

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  • Number crunching algo for learning multithreading?

    - by Austin Henley
    I have never really implemented anything dealing with threads; my only experience with them is reading about them in my undergrad. So I want to change that by writing a program that does some number crunching, but splits it up into several threads. My first ideas for this hopefully simple multithreaded program were: Beal's Conjecture brute force based on my SO question. Bailey-Borwein-Plouffe formula for calculating Pi. Prime number brute force search As you can see I have an interest in math and thought it would be fun to incorporate it into this, rather than coding something such as a server which wouldn't be nearly as fun! But the 3 ideas don't seem very appealing and I have already done some work on them in the past so I was curious if anyone had any ideas in the same spirit as these 3 that I could implement?

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  • Drawing Flowchart for function calculate a number in the Fibonacci Series

    - by truongvan
    I'm trying make Flowchart for function calculate a number in the Fibonacci Series. But It looks like not right. I don't how draw the recursive function. Please help me how to fix it. My flowchart: DIA This is my code: #include <iostream> using namespace std; long long Fibonacci(int input); int main() { cout << "Input Fibonacci Index number: "; int Index = 0; cin >> Index; cout << Fibonacci(i) << endl; return 0; } long long Fibonacci(int input) { if (input < 2) return input; else { return Fibonacci(input - 1) + Fibonacci(input - 2); } }

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  • I cancelled gparted operation ,what to do next?

    - by abcd
    I cancelled gparted operation by mistake .Now one of the partition became corrupted ,what to next? Should I format it? Data is important to me ;( Edit1: I tried to recover partition using testdisk and successfully recoverd losted partition ,but another partition(an extended partition containing ubuntus ) gone ,How to recover it? :) Edit2: testdisk saved my life ,it recovered all my partition without losing data ,

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  • Number Game Algorithm

    - by 7Aces
    Problem Link - http://www.iarcs.org.in/inoi/2011/zco2011/zco2011-1b.php The task is to find the maximum score you can get in the game. Such problems, based on games, where you have to simulate, predict the result, or obtain the maximum possible score always seem to puzzle me. I can do it with recursion by considering two cases - first number picked or last number picked, each of which again branches into two states similarly, and so on... which finally can yield the max possible result. But it's a very time-inefficient approach, since time increases exponentially, due to the large test cases. What is the most pragmatic approach to the problem, and to such problems in general?

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  • Variable number of GUI Buttons

    - by Wakaka
    I have a generic HTML5 Canvas GUI Button class and a Scene class. The Scene class has a method called createButton(), which will create a new Button with onclick parameter and store it in a list of buttons. I call createButton() for all UI buttons when initializing the Scene. Because buttons can appear and disappear very often during rendering, Scene would first deactivate all buttons (temporarily remove their onclick, onmouseover etc property) before each render frame. During rendering, the renderer would then activate the required buttons for that frame. The problem is that part of the UI requires a variable number of buttons, and their onclick, onmouseover etc properties change frequently. An example is a buffs system. The UI will list all buffs as square sprites for the current unit selected, and mousing over each square will bring up a tooltip with some information on the buff. But the number of buffs is variable thus I won't know how many buttons to create at the start. What's the best way to solve this problem? P.S. My game is in Javascript, and I know I can use HTML buttons, but would like to make my game purely Canvas-based. Create buttons on-the-fly during rendering. Thus I will only have buttons when I require them. After the render frame these buttons would be useless and removed. Create a fixed set of buttons that I'm going to assume the number of buffs per unit won't exceed. During each render frame activate the buttons accordingly and set their onmouseover property. Assign a button to each Buff instance. This sounds wrong as the buff button is a part of the GUI which can only have one unit selected. Assigning a button to every single Buff in the game seems to be overkill. Also, I would need to change the button's position every render frame since its order in the unit's list of buffs matter. Any other solutions? I'm actually quite for idea (1) but am worried about the memory/time issues of creating a new Button() object every render frame. But this is in Javascript where object creation is oh-so-common ({} mainly) due to automatic garbage collection. What is your take on this? Thanks!

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  • How do I change the format of group by data in Excel 2003 pivot tables

    - by Bernard
    I have a data that lists the value of a contract per contract number. So I've created a pivot table that counts the number of contracts valued at 0 - 10, 11 - 20, etc. I want to be able to format the group, e.g. $0 - $10, $11 - $20 I've tried formatting the underlying data as currency and formatting the column in the pivot table, but it still shows as 0 - 10, 11 - 20 Also I have a column in the pivot table that says Total which is the Count of the number of contracts in that range, i.e. Value Total 0 - 10 1 11 - 20 1 Its an autogenerated column heading that Excel put in. How do I change this to say Number of contracts. I want it changed because when I chart the pivot table, the series is called called Total :(

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  • PHP - How to remove the first number in a string?

    - by Dodi300
    Hello. How can I remove the first number in a string? Say if I had these 48 numbers seperated with a ',' (comma): 8,5,8,10,15,20,27,25,60,31,25,39,25,31,26,28,80,28,27,31,27,29,26,35,8,5,8,10,15,20,27,25,60,31,25,39,25,31,26,28,80,28,27,31,27,29,26,35 How would I remove the "8," from the string? Thanks.

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  • OBML file format

    - by Gowtham
    Opera mini browser can save HTML pages in OBML (Opera Binary Markup Language) format for offline browsing. I am wondering if I can convert a HTML file to OBML format and save in my phone for later viewing. For doing so, I need details about the OBML format, which seems to be undocumented. Do you know more details on this OBML format? Thanks for your time.

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  • ORA-00904: "FORMAT": invalid identifier

    - by gary A.K.A. G4
    I am trying to format a date: FORMAT(table.TCKT.TCKT_ISS_DATE, 'YYYY') AS TICKETYEAR but I am getting the following error: ORA-00904: "FORMAT": invalid identifier Right now the date show the complete timestamp. Any suggestions on how to fix this problem, or any other way to format the date to just show the four digit year?

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  • String.Format an integer to use 1000's separator without leading 0 for small integers

    - by Kragen
    Silly question, I want to format an integer so that it appears with the 1000's separator (,), but also without decimal places and without a leading 0. My attempts so far have been: String.Format("{0} {1}", 5, 5000); // 5 5000 String.Format("{0:n} {1:n}", 5, 5000); // 5.00 5,000.00 String.Format("{0:0,0} {1:0,0}", 5, 5000); // 05 5,000 The output I'm after is: 5 5,000 Is there something obvious that I'm missing?

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  • Clear UITextField when standard number pad is pressed

    - by Manu
    Hi all, I'm sorry if I didn't explain my problem well enough in the title. In my application, I'm using a small subview to create a very basic calculator on the top side of the screen (I just have an UITextField to show the operations and two buttons). Instead of using a custom keyboard for it, I want to use the standard iPhone number pad. My problem is that after doing an operation (e.g. adding two numbers) and showing the result, I cannot figure out how to clear the screen when the user enters a new number. So, for example: User enters "6" - Number 6 is shown in UITextField User selects "+" - UITextField is cleared to make room for the next number User enters "10" - Number 10 is shown in UITextField User selects "+" - 16 is shown as the result of the previous operation, and should stay there until another number is pressed (he wants to continue adding more numbers) User enters "5" At this point, if I was using a custom keyboard, I could clear the UITextField as soon as the button "5" is pressed by the user, but I cannot figure out how to do so when using the standard number pad. So, the result I get at the moment is "165". Is there a way to detect when a key is pressed in the standard number pad so that I can clear the UITextField before the new number appears? I thought there may be a NSNotification for that, but I couldn't find it. I'm aware that I could solve my problem if I created a custom keyboard or if I used two separated UITextFields (one for the operations and another one for the total), but I would like to use the standard number pad if it's possible. Thanks very much!

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  • Add a custom format in Rails (that will work with respond_to)

    - by Horace Loeb
    I have map.resources :posts and I want to be able to serve post bodies in markdown format. So I set up my respond_to block: respond_to do |format| format.markdown { render :text => @post.body.to_s } end But when I try to access /posts/1234.markdown, I get this error: NameError (uninitialized constant Mime::MARKDOWN): app/controllers/posts_controller.rb:96:in `show' app/controllers/posts_controller.rb:79:in `show' How do I add markdown as an acceptable format? Where can I see the list of acceptable formats?

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