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  • All things equal what is the fastest way to output data to disk in C++?

    - by user260197
    I am running simulation code that is largely bound by CPU speed. I am not interested in pushing data in/out to a user interface, simply saving it to disk as it is computed. What would be the fastest solution that would reduce overhead? iostreams? printf? I have previously read that printf is faster. Will this depend on my code and is it impossible to get an answer without profiling? Edit: Output data needs to be in text format, whether tab or comma separated. This will require formatting, precision, etc. Running in Windows.

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  • .NET Rectangle Off By 1

    - by roygbiv
    After working with the .NET GDI+ Rectangle object, I've noticed that if I create a rectangle that is X:0 * Y:0 * Width:100 * Height:100, the Right and Bottom properties are set to 100, 100. Shouldn't this be 99, 99? 0 - 99 is 100 pixels. 0 - 100 is 101 pixels. FWIW, the documentation does say the right is computed by x + width and the bottom is y + height, but is that correct? Perhaps "correct" doesn't matter here as long it's consistent? All I know is that it is somewhat (read... very) annoying!

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  • How do to check to see if the user has a Google account.

    - by skrat
    Is there any safe way to detect, on a web page, client side (JS), whether user has an Google/Yahoo/Live/? account? I know about some suspicious ways to do this by styling visited links and then sneaking on computed style attribute, but it's more of a hack, Mozilla and maybe other are planning to crack down on this, as it might be abused. But I need this to allow users more integration with their identity providers, like: Have a Google account? ~ load contacts for sharing from Google Contacts API Have an Yahoo account? ~ load contacts for sharing from Yahoo Contacts API none of the above? show no link I don't want to provide all these options to all visitors, would be nice if I can detect the account, and provide integration only in that case.

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  • stack of a c program

    - by ckarthickit
    how the stack would look like for the following program if I give input as 5. #include <stdio.h> int fibonacci(int number) { int retval; if (0 == number){ return 0; } if (1 == number){ return 1; } return(fibonacci(number-1) + fibonacci(number-2)); } int main() { int number = 0; int fibvalue = 1; while (1){ printf("please enter the number\n"); scanf("%d", &number); fibvalue = fibonacci(number); printf("computed fibonacci value %d\n", fibvalue); } return 1; } also give me links where i can learn about it

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  • Insert consecutive numbers

    - by Markus
    Hi. I have a table A (Acons, A1, A2, A3) in which I should insert information from another table B with columns (B1, B2, B3). The Acons is a column in which should contain some consecutive numbers (it is not an identity and I cannot make it identity). I know xmin - starting the from number the sequence has to be computed. How can I insert the rows into the table A, using a single Insert statement? I tried like the following, but it didn't work: DECLARE @i AS INT; SET @i = xmin; INSERT INTO A(Acons, A1, A2, A3) SELECT @i = (Bcons = (@i + 1)), B1, B2, B3 FROM B Unfortunatelly, the above solution does not work;

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  • C# regularly return values from a different thread

    - by sdds
    Hello, I'm very new to multithreading and lack experience. I need to compute some data in a different thread so the UI doesn't hang up, and then send the data as it is processed to a table on the main form. So, basically, the user can work with the data that is already computed, while other data is still being processed. What is the best way to achieve this? I would also be very grateful for any examples. Thanks in advance.

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  • knockout.js with optionsValue and value

    - by Mike Flynn
    Is there a way to keep the value binding to the object, but have the optionsValue be a property on the object. As of now if I specify both, the optionsValue property that is selected will populate the value binding. Id like to keep the object intact in the observable, but specify what value to be set in the select list value. This way a form submit will send the optionsValue I chose. @Html.DropDownListFor(q => q.DivisionId, new SelectList(Enumerable.Empty<string>()), new { data_bind="options: divisions, optionsText: 'Name', optionsValue: 'Id', value: division, optionsCaption: ' - '" }) function AddCrossPoolGameDialog() { var self = this; self.divisions = ko.observableArray([]); self.division = ko.observable(); self.awayDivisionTeams = ko.computed(function () { var division = ko.utils.arrayFirst(self.divisions(), function(item) { return self.division.Name() == item.Name; }); if (division) { return division.DivisionTeamPools; } return []; }); }

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  • getting smallest of coordinates that differ by N or more in Python

    - by user248237
    suppose I have a list of coordinates: data = [[(10, 20), (100, 120), (0, 5), (50, 60)], [(13, 20), (300, 400), (100, 120), (51, 62)]] and I want to take all tuples that either appear in each list in data, or any tuple that differs from all tuples in lists other than its own by 3 or less. How can I do this efficiently in Python? For the above example, the results should be: [[(100, 120), # since it occurs in both lists (10, 20), (13, 20), # since they differ by only 3 (50, 60), (51, 60)]] (0, 5) and (300, 400) would not be included, since they don't appear in both lists and are not different from elements in lists other than their own by 3 or less. how can this be computed? thanks.

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  • For each level of factor aggregate values over all levels except the current one (in R)

    - by Andrey Chetverikov
    For each level of factor I need to extract values aggregated over all subsets of data.frame except the current one. For example, there is a several subjects doing a reaction time task during several days, and I need to compute mean reaction time for all subjects and all days, but not including the subject for whom the mean is computed. Currently, I do it like this: library(lme4) ddply(sleepstudy, .(Subject, Days), summarise , avg_rt=mean(sleepstudy[sleepstudy$Subject!=Subject&sleepstudy$Days==Days,"Reaction"]), .progress="text") It works fine for small data sets, but for large ones it can be very slow. Is there a way to do it faster?

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  • How to manually close connection in BaseHTTPServer?

    - by user1657188
    I have a script that sends a request to an HTTP server. HTTP server script (snippet): ... class MyHandler(BaseHTTPServer.BaseHTTPRequestHandler): def do_GET(sa): pdict = cgi.parse_header(sa.headers.getheader('referer')) q = pdict[0] q = urllib.unquote(q) if q == "enternetixplorer" # basically just ignore this, doesn't have to do with the question sa.wfile.write("blah blah blah") # now restart server httpd.server_close() python = sys.executable os.execl(python, python, * sys.argv) ... The "blah blah blah" is sent back, but the connection does not seem to close, and my script is waiting forever until I abort the server. (My thought is BaseHTTPServer automatically closes connection when the last part in "do_GET()" is computed, but I prevent this by restarting the script.) If I'm right, how do I close the connection? If not, what else might be the problem? Edit: The server script HAS to restart the entire program.

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  • How do you embed a hash into a file recursively?

    - by oasisbob
    Simplest case: You want to make a text file which says "The MD5 hash of this file is FOOBARHASH". How do you embed the hash, knowing that the embedded hash value and the hash of the file are inter-related? eg, Cisco embeds hash values into their IOS images, which can be verified like this: cisco# verify s72033-advipservicesk9_wan-mz.122-33.SXH7.bin Embedded Hash MD5 : D2BB0668310392BAC803BE5A0BCD0C6A Computed Hash MD5 : D2BB0668310392BAC803BE5A0BCD0C6A IIRC, Ubuntu also includes a txt file in the root of their ISOs which have the hash of the entire ISO. Maybe I'm mistaken, but trying to figure out how to do this blows my mind.

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  • how to print not mapped value

    - by IcanMakeIt
    I am using complicated SQL queries, i have to use SqlQuery ... in simple way: MODEL: public class C { public int ID { get; set; } [NotMapped] public float Value { get; set; } } CONTROLLER: IEnumerable<C> results = db.C.SqlQuery(@"SELECT ID, ATAN(-45.01) as Value from C); return View(results.ToList()); VIEW: @model IEnumerable<C> @foreach (var item in Model) { @Html.DisplayFor(modelItem => item.Value) } and the result for item.Value is NULL. So my question is , how can i print the computed value from SQL Query ? Thank you for help.

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  • What PHP function(s) can I use to perform operations on non-integer timestamps?

    - by stephenhay
    Disclaimer, I'm not a PHP programmer, so you might find this question trivial. That's why I'm asking you! I've got this kind of timestamp: 2010-05-10T22:00:00 (That's Y-m-d) I would like to subtract, say, 10 days (or months, whatever) from this, and have my result be in the same format, i.e. 2010-04-30T22:00:00. What function(s) do I need to do this in PHP? Note: I'm using this to do a computed field in Drupal. The result will be the date that an e-mail is sent. Bonus question: If 2010-05-10T22:00:00 means "May 10, 2010 at 10pm", is there a timestamp equivalent of "May 10, 2010 (all day)"? Thanks everyone.

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  • Good Design for Initialization of Static Array

    - by jplot
    I have a question regarding good design in C++. I have a class A, and all objects of this class use an integer array of constant values (they should share the same array, as their values are constant). The array needs to be computed (just once) before any object A. I thought about having another class B which contains the integer array as a static member, an init() method which would fill this array according to some formula and a static boolean flag initialized (if this variable if true then the init() method would do nothing), but I'm not sure this is the best way to solve my design issue. So my question is, what would be a good design/way to accomplish this ? Thanks in advance.

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  • SQL Server: How to shrink FileStream files?

    - by J4N
    For a project, I'm using a SQL Server 2008 R2. One table has a filestream column. I've made some load tests, and now the database has ~20GB used. I've empty tables, except several(configuration tables). But my database was still using a lot of space. So I used the Task -> Shrink -> Database / Files But my database is still using something like 16GB. I found that it's the filestream file is still using a lot of space. The problem is that I need to backup this database to export it on the final production server, and event if I indicate to compress the backup I got a file more than 3.5Go. Not convenient to store and upload. And I'm planning much bigger test, so I want to know how to shrink that empty space. When I'm trying: I get this exception: The properties SIZE, MAXSIZE, or FILEGROWTH cannot be specified for the FILESTREAM data file 'FileStreamFile'. (Microsoft SQL Server, Error: 5509) So what should I do? I found several topics with this error but they was about removing the filestream column.

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  • Non-functioning AutoFilter on Locked Cells in Office 2008 - works in Office 2007

    - by Sarcas
    I'm looking into a problem for someone, who works in a mixed OS environment. She has created an Excel spreadsheet in Office 2007 to act as a directory, with AutoFilter turned on for names, email addresses, departments etc. To make sure no one accidentally edits email addresses (for example), she has protected the work sheet. Accessing this worksheet on a PC running Excel 2007, everything runs as you'd expect. You can filter the sheet by any of the auto-filtered columns, and because the sheet is protected, the data integrity is guaranteed. However, if you access the sheet on a Mac running Excel 2008, you can't filter the columns. What's strange here is that the AutoFilter dropdown arrows do appear in each of the column headers as you would expect. It's just that nothing happens if you click on them. If you select one of the column header cells (say, 'First Name') and check the menu: Data-Filter, you can see that AutoFilter is ticked. As another datapoint, you also seem to be able to apply an Advanced filter to these rows on the protected sheets. Does anyone know why this might be? It seems to be a compatibility issue between Excel 2007/2008 (I know the codebase isn't the same), but I can't find any references to it in documentation or forums anywhere, and it would be good to know if there's a way around this. Thanks!

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  • find the next due date after today within a group in an Excel PivotTable

    - by Dennis George
    I have got a table set up in one sheet with "transactions". Each row contains a name of a vendor, the amount owed or paid depending on transaction type, and the due date/transaction date. Here is some simplified sample data: Vendor Date Invoice Payment Vendor A 6/30 $200 Vendor A 6/30 ($200) Vendor B 7/5 $500 Vendor B 7/5 ($500) Vendor C 10/28 $50 Vendor A 10/30 $100 Vendor C 11/15 $50 I have already built a PivotTable from that table to group these transactions by vendor and sum the remainder owed. What I'm trying to figure out is how to, for each vendor, get the next due date (min date of the group, excluding dates < Today()), or if there is no next due date then I want to see the max date for that group. Here is what my PivotTable looks like, plus the date column I'd like to add (assuming Today() = 10/23): Vendor Date Owed Vendor B 7/5 - Vendor C 10/28 $100 Vendor A 10/30 $100 I know calling it next due date might not be so accurate if I end up with the date of a payment in that column, but I'm ok with that. tl;dr : I want to find the next earliest date within each group, or the last date. How do I do this?

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  • Set scheduled task last result to 0x0 manually

    - by Rogier
    Every night a task runs that checks if any scheduled task has a Last Result is not equal to 0x0. If a scheduled tasks has an error like 0x1, then automatically an e-mail is sent to me. As some tasks are running only weekly, and sometimes an error occurs which results in not equal to 0x0, every night an e-mail is sent with the error message, as the Last Result column still shows the last result of 0x1. But I would like to set the Last Result column to 0x0 manually if I solved a problem, so I won't get every night an e-mail with the error message. So is it possible to set the scheduled tasks Last Result to 0x0 manually (or by a script)? @harrymc. See located script underneath that is sending the e-mail. I can easily add a criteria to ignore result 0x1 (or another code), however this is not the solution as most of the times this result is a real error and has to be e-mailed. set [email protected] set SMTPServer=SMTPserver set PathToScript=c:\scripts set [email protected] for /F "delims=" %%a in ('schtasks /query /v /fo:list ^| findstr /i "Taskname Result"') do call :Sub %%a goto :eof :Sub set Line=%* set BOL=%Line:~0,4% set MOL=%Line:~38% if /i %BOL%==Task ( set name=%MOL% goto :eof ) set result=%MOL% echo Task Name=%name%, Task Result=%result% if not %result%==0 ( echo Task %name% failed with result %result% > %PathToScript%\taskcheckerlog.txt bmail %PathToScript%\taskcheckerlog.txt -t %YourEmailAddress% -a "Warning! Failed %name% Scheduled Task on %computername%" -s %SMTPServer% -f %FromAddress% -b "Task %name% failed with result %result% on CorVu scheduler %computername%" )

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  • Sorting/grouping when there are multiple values in one cell

    - by ngm
    I have an Excel 2007 spreadsheet, where each row of the dataset describes a feature of a piece of software. One of the columns in the spreadsheet is Relevant Users, which describes which users of the software the feature is of interest to. There may be a couple of different users interested in a feature, in which case I've been filling in the cell with the two user types separated by a colon, e.g. 'Usertype A; Usertype D'. Occassionally, I'd like to sort my data by the Relevant Users column. However, the way I'm populating the column means the sorting isn't very smart. If I have a feature where 'Relevant Users' is 'Usertype A; Usertype D', and then I sort by Relevant Users, that feature will be grouped at the end of all the other features of relevant to Usertype A, as it's just sorting alphabetically. But I want it to be listed in the two separate groups of Usertype A and Usertype D. Or, if I have a pivot table that groups the features together under the heading of Relevant User, I'll get all the features for 'Usertype A', then 'Usertype B', then 'Usertype C', then 'Usertype D', then 'Usertype A; Usertype D', etc. Whereas I really want a feature with Relevant Users as 'Usertype A; Usertype D' to show up in both the Usertype A group and the Usertype D group. I guess if this information was in a database I might have a many-to-many table linking Relevant Users to features. But is there a way to go about having this kind of many-to-many relationship in Excel?

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  • How flexible is the 'indirect' function?

    - by Chuck
    My curiosity pushes me to ask this question. If I were to have a series of functions that referenced a different column in a worksheet but all ended on the same row of data is there a way to point the 'row' part of a cell reference to a blank cell and use it has a variable to show the results of the functions up to a desired row simultaneously? Example: =Average('worksheet 1'.$A$1:'worksheet 1'.$A100) =Max('worksheet 1'.$B$1:'worksheet 1'.$B100) =Min('worksheet 1'.$C$1:'worksheet 1'.$C100) =Sum('worksheet 1'.$D$1:'worksheet 1'.$D100) Pseudo formulas... =Average('worksheet 1'.$A$1:'worksheet 1'.$A*('worksheet 2'.$A$1)*) =Max('worksheet 1'.$B$1:'worksheet 1'.$B*('worksheet 2'.$A$1)*) =Min('worksheet 1'.$C$1:'worksheet 1'.$C*('worksheet 2'.$A$1)*) =Sum('worksheet 1'.$D$1:'worksheet 1'.$D*('worksheet 2'.$A$1)*) Where 'worksheet 2'.$A$1 would only contain a number corresponding to a row in 'worksheet 1'. After stumbling upon and playing with the indirect() function I have only been able to replace the entire cell reference (Column and Row) with any success. The formula so far =SUM('worksheet 1'.C3:INDIRECT(A1)) Where A1 is on 'worksheet 2' and contains a full cell reference pointing to 'worksheet 1'. Any pointers?

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  • Storing changes to multiple databases in a single centralized database

    - by B4x
    The setup: multiple MySQL databases at different locations with the same scheme. The databases are in production. The motivation: we want to present information in these databases in a web interface, clearly showing which database the row originated from. We want to be able to get this data from one single source (for different reasons, one of them is pagination which gets tricky if you use multiple sources). The problem: how do we collect data from multiple databases, storing it at a central location and clearly marking the origin of each row? We have discussed using a centralized DB that tracks changes to the production DBs, with the same schema and one additional column for origin. If possible, we would like to avoid having to make changes in the production environment. Since we can't use MySQL's replication (multiple masters to a single slave isn't allowed), what are our other options? Are there any existing solutions for something like this or do we have to code something ourselves? Is the best solution to change the database schemas in production and add a column for origin? The idea of a centralized database isn't set in stone. If there is a solution to this that solves our other problems without a centralized DB, we can be flexible. Any help is much appreciated.

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  • How to open semicolon delimited CSV-files in US-version of Excel

    - by Holgerwa
    When I double-click on a .csv file, it is opened in Excel. The csv-files have columns delimited with semicolons (not commas, but also a valid format). Using a German Windows/Excel setup, the opened file is displayed correctly, the columns are separated where the semicolons existed in the csv-file. But when I do the same on an (US-) English Windows/Excel setup, only one column is imported, showing the whole data including the semicolons in the first column. (I don't have an English setup available for tests, users have reported the behavior) I tried to change the list separator value in Windows regional settings, but that didn't change anything. What can I do to be able to double-click-open those CSV-files on an English setup? EDIT: It seems to be the best solution not to rely on CSV-files in this case. I was hoping that there is some formatting for CSV-files that makes it possible to use them internationally. The best solution seems that I'll switch to creating XLS-files. Thanks to all for your suggestions and helpful tips!

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  • How to disable mod_security2 rule (false positive) for one domain on centos 5

    - by nicholas.alipaz
    Hi I have mod_security enabled on a centos5 server and one of the rules is keeping a user from posting some text on a form. The text is legitimate but it has the words 'create' and an html <table> tag later in it so it is causing a false positive. The error I am receiving is below: [Sun Apr 25 20:36:53 2010] [error] [client 76.171.171.xxx] ModSecurity: Access denied with code 500 (phase 2). Pattern match "((alter|create|drop)[[:space:]]+(column|database|procedure|table)|delete[[:space:]]+from|update.+set.+=)" at ARGS:body. [file "/usr/local/apache/conf/modsec2.user.conf"] [line "352"] [id "300015"] [rev "1"] [msg "Generic SQL injection protection"] [severity "CRITICAL"] [hostname "www.mysite.com"] [uri "/node/181/edit"] [unique_id "@TaVDEWnlusAABQv9@oAAAAD"] and here is /usr/local/apache/conf/modsec2.user.conf (line 352) #Generic SQL sigs SecRule ARGS "((alter|create|drop)[[:space:]]+(column|database|procedure|table)|delete[[:space:]]+from|update.+set.+=)" "id:1,rev:1,severity:2,msg:'Generic SQL injection protection'" The questions I have are: What should I do to "whitelist" or allow this rule to get through? What file do I create and where? How should I alter this rule? Can I set it to only be allowed for the one domain, since it is the only one having the issue on this dedicated server or is there a better way to exclude table tags perhaps? Thanks guys

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  • emule algorithm and how to get fast download speed.

    - by Benjamin
    Actually, I use amule in ubuntu. Because emule users are much more, I wrote emule in this title. But whatever emule or amule, it's okay. Both of them are very similar. I want to get fast-download speed as much as I can. But I don't understand emule(or amule)'s detail functions and algorithms. These are always very qurious to me. If I provide higher upload-speed or more valuable files to other people, can I get benefit?(My download speed) Is serverlist important? Does it cause my download-speed? I captured a image for my amule. Please explain these columns and let me know your tips for getting fast speed. What does 8/9+23 mean in the Source column? What does 294/300(1) mean in the Source column? What does QR:608(0) mean in the Priority? What do I do for getting fast download speed as much as I can get? You can also explain other columns.

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  • Copy one db diagram from one db to another on different servers? (Same db)

    - by sah302
    I used the copy database wizard to copy my database from our test server to our production server, the database copied everything fine except for the diagram. Okay no problem, first I make sure the target database on production has the support objects created to use database diagraming. Then I select to import data from the other database and chose the dbo.sysdiagrams.Go through with the rest of the import data wizard, but then I get the following error: Validating (Error) Messages Error 0xc0202049: Data Flow Task: Failure inserting into the read-only column "diagram_id". (SQL Server Import and Export Wizard) Error 0xc0202045: Data Flow Task: Column metadata validation failed. (SQL Server Import and Export Wizard) Error 0xc004706b: Data Flow Task: "component "Destination - sysdiagrams" (31)" failed validation and returned validation status "VS_ISBROKEN". (SQL Server Import and Export Wizard) Error 0xc004700c: Data Flow Task: One or more component failed validation. (SQL Server Import and Export Wizard) Error 0xc0024107: Data Flow Task: There were errors during task validation. (SQL Server Import and Export Wizard) So apparently it didn't like that. What's the problem? I am pretty beginner in SQL Server and only do stuff via the GUI usually so am not sure what to do at this point. The databases are the same, but on different servers. Thanks!

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