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• write error: Broken pipe

  - by Fahim

  Hi, I have to run a tool on around 300 directories. Each run take around 1 minute to 30 minute or even more than that. So, I wrote a python script having a loop to run the tool on all directories one after another. my python script has code something like: for directory in directories: os.popen('runtool_exec ' + directory) But when I run the python script I get the following error messages repeatedly: .. tail: write error: Broken pipe date: write error: Broken pipe .. All I do is login on a remote server using ssh where the tool, python script, and subject directories are kept. When I individually run the tool from command prompt using command like: runtool_exec directory it works fine. "broken pipe" error is coming only when I run using the python script. Any idea, workaround? Please suggest. Thanks. Fahim

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• Repeated Scene Trees (Java3d / OpenGL)

  - by Jim

  Hello, I want to make a 3d scene that loops around on its self. That is to say, if you keep going in any direction, you will loop back to the other side. My current implementation is so bad, it's embarrassing to admit to it. I redraw the each change twenty-seven times, to make a 3x3x3 scene cube. When the user reaches the end of the middle cube, I jump them over to the other side. Maintaining consistency (let alone performance) is a nightmare. Total Disaster. This doesn't seem like it would be an unusual request, so I'm wondering if anyone knows of a more legit solution. Thanks!

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• Spinlocks, How Much Useful Are They?

  - by unknown

  How often do you find yourself actually using spinlocks in your code? How common is it to come across a situation where using a busy loop actually outperforms the usage of locks? Personally, when I write some sort of code that requires thread safety, I tend to benchmark it with different synchronization primitives, and as far as it goes, it seems like using locks gives better performance than using spinlocks. No matter for how little time I actually hold the lock, the amount of contention I receive when using spinlocks is far greater than the amount I get from using locks (of course, I run my tests on a multiprocessor machine). I realize that it's more likely to come across a spinlock in "low-level" code, but I'm interested to know whether you find it useful in even a more high-level kind of programming?

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• Is it possible to search through json result with jQuery

  - by mickyjtwin

  What I'm trying to achieve, is to output a json list that contains a list of Css classes, and their corresponding url records, i.e. var jsonList = [{"CSSClass":"testclass1","VideoUrl":"/Movies/movie.flv"},{"CSSClass":"testclass2","VideoUrl":"/Movies/movie2.flx"}]; //]]> foreach item in the list I am adding a click event to the class... $.each(script, function() { $("." + this.CSSClass, "#pageContainer").live('click', function(e) { videoPlayer.playMovie(this); return false; }); }); What I'm wondering, is if I can somehow get the corresponding url from the jsonlist, without having to loop through them all again, searching for CSSClass, or adding the url to the link as an attribute?

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• Onpaint events (invalidated) changing execution order after a period normal operation (runtime)

  - by Luke Mcneice

  I have 3 data graphs that are painted via the their paint events. When I have data that I need to insert into the graph I call the controls invalidate() command. The first control's paint event actually creates a bitmap buffer for the other 2 graphs to avoid repeating a long loop. So the invalidate commands are in a specific order (1,2,3). This works well, however when the graphed data reaches the end of the graph window (PictureBox) where the data would normally start scrolling, the paint events begin firing in the wrong order (2,3,1). has anyone came across this before? why might this be happening?

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• Replace values in a dataframe based on another factor which contains NA's in R

  - by PaulHurleyuk

  I have a dataframe which contains (among other things) a numeric column with a concentration, and a factor column with a status flag. This status flag contains NA's. Here's an example df<-structure(list(conc = c(101.769, 1.734, 62.944, 92.697, 25.091, 27.377, 24.343, 55.084, 0.335, 23.280), status = structure(c(NA, NA, NA, NA, NA, NA, 2L, NA, 1L, NA), .Label = c("<LLOQ", "NR"), class = "factor")), .Names = c("conc", "status"), row.names = c(NA, -10L), class = "data.frame") I want to replace the concentration column with a string for some values of the flag column, or with the concentration value formatted to a certain number of significant digits. When I try this ifelse(df$status=="NR","NR",df$conc) The NA's in the status flag don't trigger either the true or false condition (and return NA) - as the documentation suggests it will. I could loop over the rows and use IF then else on each one but this seems inefficient. Am I missing something ? I've tried as.character(df$status) as well which doesn't work. My mojo must be getting low....

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• Algorithm for parsing a flat tree into a non-flat tree

  - by Chad Johnson

  I have the following flat tree: id name parent_id is_directory =========================================================== 50 app 0 1 31 controllers 50 1 11 application_controller.rb 31 0 46 models 50 1 12 test_controller.rb 31 0 31 test.rb 46 0 and I am trying to figure out an algorithm for getting this into the following tree structuree: [{ id: 50, name: app, is_directory: true children: [{ id: 31, name: controllers, is_directory: true, children: [{ id: 11, name: application_controller.rb is_directory: false },{ id: 12, name: test_controller.rb, is_directory: false }], },{ id: 46, name: models, is_directory: true, children: [{ id: 31, name: test.rb, is_directory: false }] }] }] Can someone point me in the right direction? I'm looking for steps (eg. build an associative array; loop through the array looking for x; etc.).

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• PHP Special Characters Test

  - by pws5068

  What's an efficient way of checking if a username contains a number of special characters that I define. Examples: % # ^ . ! @ & ( ) + / " ? ` ~ < { } [ ] | = - ; I need to detect them and return a boolean, not just strip them out. Probably a super easy question but I need a better way of doing this than a huge list of conditionals or a sloppy loop.

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• How to deal with OpenMP thread pool contention

  - by dpe82

  I'm working on an application that uses both coarse and fine grained multi-threading. That is, we manage scheduling of large work units on a pool of threads manually, and then within those work units certain functions utilize OpenMP for finer grain multithreading. We have realized gains by selectively using OpenMP in our costliest loops, but are concerned about creating contention for the OpenMP worker pool as we add OpenMP blocks to cheaper loops. Is there a way to signal to OpenMP that a block of code should use the pool if it is available, and if not it should process the loop serially?

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• very large string in memory

  - by bushman

  Hi, I am writing a program for formatting 100s of MB String data (nearing a gig) into xml == And I am required to return it as a response to an HTTP (GET) request . I am using a StringWriter/XmlWriter to build an XML of the records in a loop and returning the stringWriter.ToString() during testing I saw a few --out of memory exceptions-- and quite clueless on how to find a solution? do you guys have any suggestions for a memory optimized delivery of the response? is there a memory efficient way of encoding the data? or maybe chunking the data -- I just can not think of how to return it without building the whole thing into one HUGE string object thanks

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• Quadratic bezier curve: Y coordinate for a given X ?

  - by stefan.at.wpf

  Hello, I have a quadratic bezier curve and I need the Y coordinate of a point on the bezier curve for a given X coordinate. I know that in pure maths this can be easily done, but I'm wondering is there's a simple / another way for this in C# / WPF? Is it possible to get the single points used by C# / WPF for drawing the bezier curve and then maybe just loop them and compare the X coordinate of each point with the given X coordinate? BTW for the mathematical way it would be good to know which step for the parameter t of the bezier curve has been choosen by C# / WPF? Any chance to find this out? Probably t is just scaled by / steps for t are 1/(distance of P0 and P2) ? Thank you very much for any hint!

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• PHP Key name array

  - by Sean McRaghty

  I have an array $data fruit => apple, seat => sofa, etc. I want to loop through so that each key becomes type_key[0]['value'] so eg type_fruit[0]['value'] => apple, type_seat[0]['value'] => sofa, and what I thought would do this, namely foreach ($data as $key => $value) { # Create a new, renamed, key. $array[str_replace("/(.+)/", "type_$1[0]['value']", $key)] = $value; # Destroy the old key/value pair unset($array[$key]); } print_r($array); Doesn't work. How can I make it work? Also, I want everything to be in the keys (not the values) to be lowercase: is there an easy way of doing this too? Thanks.

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• Throw of a die in Java

  - by Arkapravo

  The throw of a die is a popular program in Java, public class Die { /* This program simulates rolling a die */ public static void main(String[] args) { int die; // The number on the die. die = (int)(Math.random()*6 + 1); System.out.println (die); } // end main() } // end class What I wish to do is make it repeat, 500 times. I have not been able to put this program into a loop of 500. I usually program in Python, thus I guess my Java has rusted ! Any help is most welcome !

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• D-Day Calendar has wrong dates when importing from google calendar?

  - by chobo2

  Hi I am using D-Day calendar and I am not sure but I got a weird problem. I basically have this for my code iCalendar iCal = iCalendar.LoadFromStream(file.InputStream); foreach (Event evt in iCal.Events) { DateTime start = evt.DTStart.Date; DateTime end = evt.DTEnd.Date; // loop through it and get values. } Yet when I import a calendar from google calendar the end date is messed up on some of the stuff I am importing. Like for instance I have this Title: should not show When: Sun, March 21(all day). Yet when I import it in. I says the start date is the 21st yet the end date is the 22nd when it should be the 21st. Not sure what is going on. I am not really sure what other info I can give you guys.

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• Parsing complex string using regex

  - by wojtek_z

  My regex skills are not very good and recently a new data element has thrown my parser into a loop Take the following string "+USER=Bob Smith-GROUP=Admin+FUNCTION=Read/FUNCTION=Write" Previously I had the following for my regex : [+\\-/] Which would turn the result into USER=Bob Smith GROUP=Admin FUNCTION=Read FUNCTION=Write FUNCTION=Read But now I have values with dashes in them which is causing bad output New string looks like "+USER=Bob Smith-GROUP=Admin+FUNCTION=Read/FUNCTION=Write/FUNCTION=Read-Write" Which gives me the following result , and breaks the key = value structure. USER=Bob Smith GROUP=Admin FUNCTION=Read FUNCTION=Write FUNCTION=Read Write Can someone help me formulate a valid regex for handling this or point me to some key / value examples. Basically I need to be able to handle + - / signs in order to get combinations.

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• Programming an Event listener for files in a directory on Linux

  - by Epitaph

  On Ubuntu linux, when you watch a flash video, it gets saved temporarily in the /tmp as flv files while the video buffers. I use vlc to directly play these files. Currently, I have scripted a shortcut that directly scans and opens the latest file in /tmp with vlc, when clicked. But, I want to program a Java application that will continually monitor this /tmp directory for any new flv files, and open it in vlc automatically. I know I can use Runtime.exec() to open the VLC application with the flv files. But, I DO NOT want to run a while(true) loop (with sleep) to scan for files. How can I make use of Event Handling (Java or any other language) on Linux to complete this task?

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• Objective C / iPhone comparing 2 CLLocations /GPS coordinates help

  - by user289503

  Ok , so thanks to Claus Broch I made some progress with comparing two GPS locations. I need to be able to say "IF currentlocation IS EQUAL TO (any GPS position from a list ) THEN do something My code at the moment is : CLLocationCoordinate2D bonusOne; bonusOne.latitude = 37.331689; bonusOne.longitude = -122.030731; Which is the simulators GPS location at Infinite Loop CLLocation *loc1 = [[CLLocation alloc] initWithLatitude:bonusOne.latitude longitude:bonusOne.longitude]; double distance = [loc1 getDistanceFrom:newLocation]; if(distance <= 10000000) { Then do something } Any number under 10000000 and it assumes that there is no match. Any ideas ? Thanks is advance.

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• Extracting data from multiple servers SQL 2005 SSIS

  - by Raj

  I have created an SSIS package to connect to multiple SQL servers, create a database, a table and a stored procedure. The package also creates a job and schedules it to run every 5 minutes. The requirement is to collect performance metrics. I am using an ado object variable to get the server names and all the above tasks are in a for each loop and everything works fine. Now the problem: I need to create a data flow task, which will connect to each of these servers in turn, copy the performance metrics data over to a central server and purge the source table. I am unable to get this task to work. This task fails with "Unable to obtain Connection" error. Any help will be greatly appreciated. SQL Server Version : 2005 Thanks, Raj

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• Ruby on Rails: Model.all.each vs find_by_sql("SELECT * FROM model").each ?

  - by B_

  I'm fairly new to RoR. In my controller, I'm iterating over every tuple in the database. For every table, for every column I used to call SomeOtherModel.find_by_sql("SELECT column FROM model").each {|x| #etc } which worked fine enough. When I later changed this to Model.all(:select => "column").each {|x| #etc } the loop starts out at roughly the same speed but quickly slows down to something like 100 times slower than the the find_by_sql command. These calls should be identical so I really don't know what's happening. I know these calls are not the most efficient but this is just an intermediate step and I will optimize it more once this works correctly. Thanks!

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• Dynamic type for List<T>?

  - by Brett

  Hi All, I've got a method that returns a List for a DataSet table public static List<string> GetListFromDataTable(DataSet dataSet, string tableName, string rowName) { int count = dataSet.Tables[tableName].Rows.Count; List<string> values = new List<string>(); // Loop through the table and row and add them into the array for (int i = 0; i < count; i++) { values.Add(dataSet.Tables[tableName].Rows[i][rowName].ToString()); } return values; } Is there a way I can dynamically set the datatype for the list and have this one method cater for all datatypes so I can specify upon calling this method that it should be a List<int or List<string> or List<AnythingILike>? Also, what would the return type be when declaring the method? Thanks in advance, Brett

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• Basecamp API Rails

  - by dannymcc

  Hi Everyone, I was wondering if someone could do me massive favour.. I really don't understand how to make use of API's - so I was wondering if, using Basecamp as an example, someone could talk me though the basics. So far I have an application with a dashboard controller/view, I have put basecamp.rb into my /lib directory, added the following to my application_controller: def basecamp_connect Basecamp.establish_connection!('XXXXXX.basecamphq.com', 'USER', 'PASS', false) @basecamp = Basecamp.new end Obviously changing the required parts to my credentials. Next up I have added the following to my dashboard_controller: def index Basecamp::TodoList.find(:all) end Next I presume I have to somehow list the Todo's on the dashboard using some sort of loop. Am I doing the right thing, if so - how on earth do I display all the todo items and if not - what am I doing wrong/missing. It doesn't have to be todo's, anything from basecamp or any other popular API service would be a good start. It's just that I happen to have a basecamp account! Thanks, Danny

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• PHP PDO bindValue() weird problem

  - by TheMagician

  <?php try { $db = new PDO("mysql:host=localhost;dbname=DBNAME", "USER", "PASSWD"); $stmt = $db->prepare("SELECT id, name FROM testdb ORDER BY time DESC LIMIT :index, 10"); $stmt->bindValue(":index", $_GET['index'], PDO::PARAM_INT); $stmt->execute(); while( $r = $stmt->fetch(PDO::FETCH_ASSOC) ) { echo var_dump($r); } } catch( PDOException $e ) { die("Exception"); } The problem is on this line: $stmt-bindValue(":index", $_GET['index'], PDO::PARAM_INT); And the specific parameter is the second one. The code as it is above doesn't work, it doesn't return anything so the while loop isn't executed. If I replace $_GET['index'] with a number, like 10, it works just fine, it returns 10 rows. Echoing $_GET['index'] displays a number, so it should pass a number. I've also tried bindParam, but the result is same. Why isn't this working?

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• Nutch - how to crawl by small patches?

  - by Yurish

  Hi everyone! I am stuck! Can`t get Nutch to crawl for me by small patches. I start it by bin/nutch crawl command with parameters -depth 7 and -topN 10000. And it never ends. Ends only when my HDD is empty. What i need to do: Start to crawl my seeds with possibility to go further on outlinks. Crawl 20000 pages, then index them. Crawl another 20000 pages, index them and merge with first index. Loop step 3 n times. Tried also with scripts found in wiki, but all scripts i found don't go further. If i run them again, they do everything from beginning. And in the end of script i have the same index i had, when started to crawl. But, i need to continue my crawl. Some help would be very usefull!

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• Looping through worksheets in an Excel (xls) file using classic ASP on a win 2008 server

  - by Roy

  Hi, I have just migrated an older ASP solution to a windows 2008 server and everything works out fine except for using ADOX.Catalog to list all the worksheets in an uploaded xls file. I use the following code: <% Set objExcelCon = Server.CreateObject("ADODB.Connection") With objExcelCon .Provider = "Microsoft.ACE.OLEDB.12.0" .ConnectionString = "Data Source=" & strFilePath & "\" & strFileName & ";Extended Properties=Excel 12.0;" .Open End With Set objAdo = Server.CreateObject("ADOX.Catalog") ' Set ADOX activeConnection objAdo.activeConnection = objExcelCon ' Loop through tables (worksheets) For i = 0 To objAdo.Tables.Count - 1 response.Write objAdo.Tables(i).Name Next Set objExcelCon = Nothing Set objAdo = Nothing % When I run this i get no error message or anything. Anyone got any idea whats causing this? Best regards, Roy

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• Matching n parentheses in perl regex

  - by coding_hero

  Hi, I've got some data that I'm parsing in Perl, and will be adding more and more differently formatted data in the near future. What I would like to do is write an easy-to-use function, that I could pass a string and a regex to, and it would return anything in parentheses. It would work something like this (pseudocode): sub parse { $data = shift; $regex = shift; $data =~ eval ("m/$regex/") foreach $x ($1...$n) { push (@ra, $x); } return \@ra; } Then, I could call it like this: @subs = parse ($data, '^"([0-9]+)",([^:]*):(\W+):([A-Z]{3}[0-9]{5}),ID=([0-9]+)'); As you can see, there's a couple of issues with this code. I don't know if the eval would work, the 'foreach' definitely wouldn't work, and without knowing how many parentheses there are, I don't know how many times to loop. This is too complicated for split, so if there's another function or possibility that I'm overlooking, let me know. Thanks for your help!

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