Search Results

Search found 32753 results on 1311 pages for 'row number'.

facebook twitter digg google delicious technorati stumbleupon myspace wordpress linkedin gmail igoogle windows live tumblr viadeo yahoo buzz yahoo mail yahoo bookmarks favorites email print

Page 182/1311 | < Previous Page | 178 179 180 181 182 183 184 185 186 187 188 189  | Next Page >

  • Maximum number of files in one ext3 directory while still getting acceptable performance?

    - by knorv
    I have an application writing to an ext3 directory which over time has grown to roughly three million files. Needless to say, reading the file listing of this directory is unbearably slow. I don't blame ext3. The proper solution would have been to let the application code write to sub-directories such as ./a/b/c/abc.ext rather than using only ./abc.ext. I'm changing to such a sub-directory structure and my question is simply: roughly how many files should I expect to store in one ext3 directory while still getting acceptable performance? What's your experience? Or in other words; assuming that I need to store three million files in the structure, how many levels deep should the ./a/b/c/abc.ext structure be? Obviously this is a question that cannot be answered exactly, but I'm looking for a ball park estimate.

    Read the article

  • How to raise an error, if the parsed number of a C++ stdlib stream is immediatly followed by a non whitespace character?

    - by Micha Wiedenmann
    In the following example, I didn't expect, that 1.2345foo would be parsed. Since I am reading data files, it is probably better to raise an error and notify the user. Is peek() the correct thing to do here? #include <iostream> #include <sstream> int main() { std::stringstream in("1.2345foo"); double x; in >> x; if (in) { std::cout << "good\n"; } else { std::cout << "bad\n"; } } Output good

    Read the article

  • How to store Hierarchical K-Means tree for a large number of images, using Opencv?

    - by AquaAsh
    I am trying to make a program that will find similar images from a dataset of images. The steps are 1)extract SURF descriptors for all images 2)store the descriptors 3)Apply knn on the stored descriptors 4)Match the stored descriptors to the query image descriptor using KNN Now each images SURF descriptor will be stored as Hierarchical k means tree, now do I store each tree as a separate file or is it possible to build some sort of single tree with all the images descriptors and updated as images are added to dataset. This is the paper I am basing the program on www.ijest.info/docs/IJEST10-02-03-13.pdf.

    Read the article

  • How to pick random (small) data samples using Map/Reduce?

    - by Andrei Savu
    I want to write a map/reduce job to select a number of random samples from a large dataset based on a row level condition. I want to minimize the number of intermediate keys. Pseudocode: for each row if row matches condition put the row.id in the bucket if the bucket is not already large enough Have you done something like this? Is there any well known algorithm? A sample containing sequential rows is also good enough. Thanks.

    Read the article

  • How can I add similar functionality to a number of methods in java?

    - by Roman
    I have a lot of methods for logging, like logSomeAction, logAnotherAction etc. Now I want all these methods make a small pause after printing messages (Thread.sleep). If I do it manually, I would do something like this: //before: public static void logSomeAction () { System.out.println (msg(SOME_ACTION)); } //after: public static void logSomeAction () { System.out.println (msg(SOME_ACTION)); try { Thread.sleep (2000); } catch (InterruptedException ignored) { } } I remember that Java has proxy classes and some other magic-making tools. Is there any way avoid copy-n-pasting N sleep-blocks to N logging methods?

    Read the article

  • Using excel, how can I count the number of cells in a column containing the text "true" or "false"?

    - by Jay Elston
    I have a spreadsheet that has a column of cells where each cell contains a single work. I would like to count the occurrences of some words. I can use the COUNTIF function for most words, but if the word is "true" or "false", I get 0. A B 1 apples 2 2 true 0 3 false 0 4 oranges 1 5 apples In the above spreadsheet table, I have these formulas in cells B1, B2, B3 and B4: =COUNTIF(A1:A5,"apples") =COUNTIF(A1:A5,"true") =COUNTIF(A1:A5,"false") =COUNTIF(A1:A5,"oranges) As you can see, I can count apples, but not true or false. I have also tried this: =COUNTIF(A1:A5,TRUE) But that does not work either. Note -- I am using Excel 2007.

    Read the article

  • zebra stripes over riding my highlighting color

    - by pfaaf
    I am using this code to navigate through keyboard in table grid.In my code i have not added this zebra stripes coding.If i add this zebra stripes is overriding my highlighting. eg:first row dark color and second row white color.I can see highlight through keyboard in first row but i can see in second row. [http://jsfiddle.net/hKZqS/15/] This coding for zebra stripes $("#myTable").tablesorter({ widgets: ['zebra']} ); I have an alternate solution is using border but how do i apply it here in my css.

    Read the article

  • Is there a single query that can update a "sequence number" across multiple groups?

    - by Drarok
    Given a table like below, is there a single-query way to update the table from this: | id | type_id | created_at | sequence | |----|---------|------------|----------| | 1 | 1 | 2010-04-26 | NULL | | 2 | 1 | 2010-04-27 | NULL | | 3 | 2 | 2010-04-28 | NULL | | 4 | 3 | 2010-04-28 | NULL | To this (note that created_at is used for ordering, and sequence is "grouped" by type_id): | id | type_id | created_at | sequence | |----|---------|------------|----------| | 1 | 1 | 2010-04-26 | 1 | | 2 | 1 | 2010-04-27 | 2 | | 3 | 2 | 2010-04-28 | 1 | | 4 | 3 | 2010-04-28 | 1 | I've seen some code before that used an @ variable like the following, that I thought might work: SET @seq = 0; UPDATE `log` SET `sequence` = @seq := @seq + 1 ORDER BY `created_at`; But that obviously doesn't reset the sequence to 1 for each type_id. If there's no single-query way to do this, what's the most efficient way? Data in this table may be deleted, so I'm planning to run a stored procedure after the user is done editing to re-sequence the table.

    Read the article

  • Iphone App deve- Very basic table view but getting errors , trying for 2 days!! just for info using

    - by user342451
    Hi guys, trying to write this code since 2 days now, but i keep getting error, it would be nice if anyone could sort this out, thanks. Basically its the same thing i doing from the tutorial on youtube. awaiting a reply // // BooksTableViewController.m // Mybooks // // import "BooksTableViewController.h" import "BooksDetailViewController.h" import "MYbooksAppDelegate.h" @implementation BooksTableViewController @synthesize BooksArray; @synthesize BooksDetailViewController; /* - (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier { if ((self = [super initWithStyle:style reuseIdentifier:reuseIdentifier])) { // Initialization code } return self; } */ (void)viewDidLoad { [super viewDidLoad]; self.title = NSLocalizedString(@"XYZ",@"GOD is GREAT"); NSMutableArray *array = [[NSArray alloc] initWithObjects:@"H1",@"2",@"3",nil]; self.booksArray = array; [array release]; } /* // Override to allow orientations other than the default portrait orientation. - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationPortrait); } */ (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview // Release anything that's not essential, such as cached data } pragma mark Table view methods (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } // Customize the number of rows in the table view. - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [self.booksArray count]; } // Customize the appearance of table view cells. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *identity = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identity]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:identity] autorelease]; } // Set up the cell... cell.textLabel.text = [booksArray objectAtIndex:indexPath.row]; return cell; } /* - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { booksDetailsViewControler *NC = [[booksDetailsViewControler alloc] initWithNibName:@"BooksDetailsView" bundle:nil]; [self.navigationController pushViewController:NC animated:YES]; //[booksDetailViewController changeProductText:[booksArray objectAtIndex:indexPath.row]]; } */ NSInteger row = [indexPath row]; if (self.booksDetailViewController == nil) { BooksiDetailViewController *aCellDetails = [[AartiDetailViewController alloc] initWithNibName:@" BooksDetailViewController" bundle:nil]; self.booksDetailViewController = aCellDetails; [aCellDetails release]; } booksDetailViewController.title = [NSString stringWithFormat:@"%@", [booksArray objectAtIndex:row]]; //DailyPoojaAppDelegate *delegate = [[UIApplication sharedApplication] delegate]; //[delegate.AartiNavController pushViewController:aartiDetailsViewControler animated:YES]; [self.navigationController pushViewController:aartiDetailViewController animated:YES]; } /* NSInteger row = [indexPath row]; if (self.booksDetailsViewControler == nil) { AartiDetailsViewControler *aBookDetail = [[BooksDetailsViewControler alloc] initWithNibName:@"booksDetaislView" bundle:nil]; self.booksDetailsViewControler = aBookDetail; [aBookDetail release]; } booksDetailsViewControler.title = [NSString stringWithFormat:@"%@", [booksArray objectAtIndex:row]]; [self.navigationController pushViewController:booksDetailsViewControler animated:YES]; */ (void)dealloc { [aartiDetailViewController release]; [super dealloc]; } @end

    Read the article

  • linq to xml selection/update

    - by gleasonomicon
    If I have the following xml, how would I use linq to xml blank out the date fields in each video node? I wanted to do it for the purpose of a comparison in a unit test. <?xml version="1.0" encoding="utf-8" standalone="yes" ?> <main> <videos> <video> <id>00000000-0000-0000-0000-000000000000</id> <title>Video Title</title> <videourl>http://sample.com</videourl> <thumbnail>http://sample.com</thumbnail> <dateCreated>2011-01-12T18:54:56.7318386-05:00</dateCreated> <dateModified>2011-02-12T18:54:56.7318386-05:00</dateModified> <Numbers> <Number>28</Number> <Number>78</Number> </Numbers> </video> <video> <id>00000000-0000-0000-0000-000000000000</id> <title>Video Title</title> <videourl>http://sample.com</videourl> <thumbnail>http://sample.com</thumbnail> <dateCreated>2011-01-12T18:54:56.7318386-05:00</dateCreated> <dateModified>2011-02-12T18:54:56.7318386-05:00</dateModified> <Numbers> <Number>28</Number> <Number>78</Number> </Numbers> </video> </videos>

    Read the article

  • How to limit the number of post values on UpdatePanel ?

    - by Aristos
    I have notice that the UpdatePanel post every field included on the form on every trigger. But in most of my cases I use 2-3 UpdatePanels at the same page, and each one is independent. When I click for update the one panel, then my page receive all the input data of the page (ok this is logical) but I won to read only this UpdatePanels data and act according, and not the other panels data. So I see that a lot of traffic is happened this way. So is there a way to say to one UpdatePanel - send only my input data, and not everything found on the page. ? Thank you in advanced.

    Read the article

  • How could I pass the float number by value in obj-c?

    - by user313439
    - (void)applicationDidFinishLaunching:(UIApplication *)application{ // Override point for customization after application launch [window makeKeyAndVisible]; [self printFloat:1.3f]; } - (void)printFloat:(float)f { NSLog(@"%f",f); } I passed the "1.3f" to printFloat, but it was the wrong value (in this case, -2.000000) after "f" received. And there is a warning that "AppDelegate may not respond to -printFloat:" Where did I get it wrong? Thanks.

    Read the article

  • If a Matlab function returns a variable number of values, how can I get all of them as a cellarray,

    - by kaleidomedallion
    I am writing a function to remove some values from a cellarray, like so: function left = remove(cells, item); left = cells{cellfun(@(i) ~isequal(item, i), cells)}; But when I run this, left has only the first value, as the call to cells{} with a logical array returns all of the matching cells as separate values. How do I group these separate return values into a single cellarray? Also, perhaps there is already a way to remove a given item from a cellarray? I could not find it in the documentation.

    Read the article

  • Write a function int mystrlen(char *s) that returns the number of characters in a string wuthout str

    - by henry
    heres what i did, i just have ne error that i cant figure out. int mystrlen(char string[]) { char string1[LENGHT], string2[LENGHT]; int len1, len2; char newstring[LENGHT*2]; printf("enter first string:\n"); len1 = mystrlen(string1); printf("enter second string:\n"); len2 = mystrlen(string2); if(len1 == EOF || len2 == EOF) exit(1); strcpy(newstring, string1); strcat(newstring, string2); printf("%s\n", newstring); return 0;

    Read the article

  • Ignore first line on csv parse Rails

    - by Jack
    Hi, I am using the code from this tutorial to parse a CSV file and add the contents to a database table. How would I ignore the first line of the CSV file? The controller code is below: def csv_import @parsed_file=CSV::Reader.parse(params[:dump][:file]) n = 0 @parsed_file.each do |row| s = Student.new s.name = row[0] s.cid = row[1] s.year_id = find_year_id_from_year_title(row[2]) if s.save n = n+1 GC.start if n%50==0 end flash.now[:message] = "CSV Import Successful, #{n} new students added to the database." end redirect_to(students_url) end

    Read the article

  • finding the total number of distinct shortest paths between 2 nodes in undirected weighted graph in linear time?

    - by logan
    I was wondering, that if there is a weighted graph G(V,E), and I need to find a single shortest path between any two vertices S and T in it then I could have used the Dijkstras algorithm. but I am not sure how this can be done when we need to find all the distinct shortest paths from S to T. Is it solvable on O(n) time? I had one more question like if we assume that the weights of the edges in the graph can assume values only in certain range lets say 1 <=w(e)<=2 will this effect the time complexity?

    Read the article

  • Very basic table view but getting errors

    - by user342451
    Hi guys, trying to write this code since 2 days now, but i keep getting error, it would be nice if anyone could sort this out, thanks. Basically its the same thing i doing from the tutorial on youtube. awaiting a reply // // BooksTableViewController.m // Mybooks // // #import "BooksTableViewController.h" #import "BooksDetailViewController.h" #import "MYbooksAppDelegate.h" @implementation BooksTableViewController @synthesize BooksArray; @synthesize BooksDetailViewController; /* - (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier { if ((self = [super initWithStyle:style reuseIdentifier:reuseIdentifier])) { // Initialization code } return self; } */ - (void)viewDidLoad { [super viewDidLoad]; self.title = NSLocalizedString(@"XYZ",@"GOD is GREAT"); NSMutableArray *array = [[NSArray alloc] initWithObjects:@"H1",@"2",@"3",nil]; self.booksArray = array; [array release]; } /* // Override to allow orientations other than the default portrait orientation. - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationPortrait); } */ - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview // Release anything that's not essential, such as cached data } #pragma mark Table view methods - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } // Customize the number of rows in the table view. - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [self.booksArray count]; } // Customize the appearance of table view cells. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *identity = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identity]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:identity] autorelease]; } // Set up the cell... cell.textLabel.text = [booksArray objectAtIndex:indexPath.row]; return cell; } /* - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { booksDetailsViewControler *NC = [[booksDetailsViewControler alloc] initWithNibName:@"BooksDetailsView" bundle:nil]; [self.navigationController pushViewController:NC animated:YES]; //[booksDetailViewController changeProductText:[booksArray objectAtIndex:indexPath.row]]; } */ NSInteger row = [indexPath row]; if (self.booksDetailViewController == nil) { BooksiDetailViewController *aCellDetails = [[AartiDetailViewController alloc] initWithNibName:@" BooksDetailViewController" bundle:nil]; self.booksDetailViewController = aCellDetails; [aCellDetails release]; } booksDetailViewController.title = [NSString stringWithFormat:@"%@", [booksArray objectAtIndex:row]]; //DailyPoojaAppDelegate *delegate = [[UIApplication sharedApplication] delegate]; //[delegate.AartiNavController pushViewController:aartiDetailsViewControler animated:YES]; [self.navigationController pushViewController:aartiDetailViewController animated:YES]; } /* NSInteger row = [indexPath row]; if (self.booksDetailsViewControler == nil) { AartiDetailsViewControler *aBookDetail = [[BooksDetailsViewControler alloc] initWithNibName:@"booksDetaislView" bundle:nil]; self.booksDetailsViewControler = aBookDetail; [aBookDetail release]; } booksDetailsViewControler.title = [NSString stringWithFormat:@"%@", [booksArray objectAtIndex:row]]; [self.navigationController pushViewController:booksDetailsViewControler animated:YES]; */ - (void)dealloc { [aartiDetailViewController release]; [super dealloc]; } @end

    Read the article

  • Is it faster to loop through a Python set of number or a set of letters?

    - by Scott Bartell
    Is it faster to loop through a Python set of numbers or a Python set of letters given that each set is the exact same length and each item within each set is the same length? Why? I would think that there would be a difference because letters have more possible characters [a-zA-Z] than numbers [0-9] and therefor would be more 'random' and likely affect the hashing to some extent. numbers = set([00000,00001,00002,00003,00004,00005, ... 99999]) letters = set(['aaaaa','aaaab','aaaac','aaaad', ... 'aaabZZ']) # this is just an example, it does not actually end here for item in numbers: do_something() for item in letters: do_something() where len(numbers) == len(letters) Update: I am interested in Python's specific hashing algorithm and what happens behind the scenes with this implementation.

    Read the article

facebook twitter digg google delicious technorati stumbleupon myspace wordpress linkedin gmail igoogle windows live tumblr viadeo yahoo buzz yahoo mail yahoo bookmarks favorites email print

< Previous Page | 178 179 180 181 182 183 184 185 186 187 188 189  | Next Page >