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• Using Closure Properties to prove Regularity

  - by WATWF

  Here's a homework problem: Is L_4 Regular? Let L_4 = L*, where L={0^i1^i | i>=1}. I know L is non-regular and I know that Kleene Star is a closed operation, so my assumption is that L_4 is non-regular. However my professor provided an example of the above in which L = {0^p | p is prime}, which he said was regular by proving that L* was equal to L(000* + e) by saying each was a subset of one another (e in this case means the empty word). So his method involved forming a regex of 0^p, but how I can do that when I essentially have one already?

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• Prevent UIWebView sliding off the screen (iPhone)

  - by DisposableHeart

  I have a full screen UIWebView component on the screen with fixed size content, so no scrolling required. When I nudge the screen the content in moving up or down. The same effect can one experience all over the iPhone when there is a scroll-enabled component. I would like to prevent this happening in my application. Please shed some light...

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• C++ context menu image at left side showing partially, no fully

  - by Samir

  In C++ #define BITMAP_MAIN 201 //in resource.h BITMAP_MAIN BITMAP "main.bmp" // in .rc file // showing icon in menu... HBITMAP imgMain = LoadBitmap( aHinstance, MAKEINTRESOURCE(BITMAP_MAIN) ); SetMenuItemBitmaps ( hSubmenu, uMenuIndex, MF_BYPOSITION, imgMain, imgMain); The problem is in non-English XP OS the main.bmp is showing partially in the context menu. In Vista, Window7 main.bmp is showing just fine. Also in English XP its ok. But why the image is not showing fully in non-English XP? How would I use .ico file here instead of .bmp? This is to make the image transparent.

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• How do you get left position of parent element

  - by littleMan

  I've tried using position.left it says invalid object i've tried css.('left') i don't really know what to do. I want to get the position of the parent element so I can animate the child element left position Im creating a scrolling effect. <div id="MyDiv"> <div>Element 1</div> <div>Element 2</div></div><div id="Prev">Prev</div><div id="Next">Next</div>

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• jQuery slideToggle - when div is toggled it pushes content out of viewable area (IE)

  - by Chris

  This is an annoying ocurrance in IE when I use the jQuery slideToggle effect. Without the div being open, page looks normal. The minute I toggle the div open, it extends past the current content, overtop of the footer, and out of the viewable browser area (Even after scrolling all the way down). This feature seems to work just fine in firefox. Do I need an additional hack or CSS to make it work in IE8?

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• Is there something faster than -drawInRect:withFont:lineBreakMode:alignment: ?

  - by mystify

  Shark shows me that this method takes a HUGE performance hit. Like 80% in my table view. All I do is draw two labels per cell (about 8 in total per page). During scrolling. I drawInRect: with that. Are there some better methods? Like drawing directly to some layer?

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• Does an HTTPS SharePoint Site Need to Use HTTPS-Compliant Web Parts?

  - by bporter

  I am new to SharePoint, so this question may be a little naive. However, I sincerely appreciate any help with this. We are planning to create a new sub-site within our company's intranet site, which is built on SharePoint 2007. We want to add a 3rd-party weather web part (which is just a widget to display the local weather forecast) to the home page of the new intranet site. Since the intranet site uses HTTPS, do we need to find an HTTPS-compliant web part? Or, is it possible to use any web part and then configure it to use HTTPS? I'm assuming that if we use a non-HTTPS web part, then users will get some sort of "This page contains both secure and non-secure items" error message when they load the page.

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• iphone, need to put many text boxes on the view, how to scroll down to view more content?

  - by Siegfried

  iphone, need to put many text boxes on the view, how to scroll down to view more content? I actually put buttons and labels on the ScrollView, but the scrolling doesn't work. Do I need to write any code for that, any example? Thanks.

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• Is It Safe to Cast Away volatile?

  - by Yan Cheng CHEOK

  Most of the time, I am doing this way. class a { public: ~ a() { i = 100; // OK delete (int *)j; // Compiler happy. But, is it safe? // Error : delete j; } private: volatile int i; volatile int *j; }; int main() { a aa; } However, I saw an article here: https://www.securecoding.cert.org/confluence/display/seccode/EXP32-C.+Do+not+access+a+volatile+object+through+a+non-volatile+reference Casting away volatile allows access to an object through a non-volatile reference. This can result in undefined and perhaps unintended program behavior. So, what will be the workaround for my above code example?

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• Java GUI guidance on building a chat box

  - by Allen

  I'm just looking for a little guidance as to how i might implement a chat box. There needs to be a text area for user entry, and a scrolling list of past messages. Is there an easy/standard way of going about doing this? Thanks

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• WPF ListView Show selected item

  - by Jeffrey

  hi, i want to show the selected item in a list view automatically(it isn't possible to show all items without scrolling). this.listView.SelectedIndex = 999; selects of course an item, but it doesn't show it. what can i use to show it automatically ? kind regards, jeff

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• Is there ability to load page images partially when scroll down to it or is it just effect ?

  - by Space Cracker

  I have noticed in some site such as http://mashable.com that when you open page and try to scroll it , it appear to load images when you reach it .. i don't know if it's a just flicker effect or it's really done to make less load of images till scrolling to it ?

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• How to replace all the blanks within square brackets with an underscore using sed?

  - by Ringerrr

  I figured out that in order to turn [some name] into [some_name] I need to use the following expression: s/\(\[[^ ]*\) /\1_/ i.e. create a backreference capture for anything that starts with a literal '[' that contains any number of non space characters, followed by a space, to be replaced with the non space characters followed by an underscore. What I don't know yet though is how to alter this expression so it works for ALL underscores within the braces e.g. [a few words] into [a_few_words]. I sense that I'm close, but am just missing a chunk of knowledge that will unlock the key to making this thing work an infinite number of times within the constraints of the first set of []s contained in a line (of SQL Server DDL in this case). Any suggestions gratefully received....

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• Gtk GtkScrolledWindow Size.

  - by PP

  Actually i want o hide/remove scroll bars from GtkScrolledWindow but i think it is not possible so is there any way that i can set size of scrolling bar to 0 so that it will not be visible, using style or something like that.

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• Mouse Wheel Scroll

  - by Rahat

  Is there anyway to capture the time interval between mouse wheel scroll stat and stop. Actually i wan to capture the interval between the scrolling start and stop when i very quickly scroll the mouse wheel. Any advice will be appreciated.

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• MPI_Bsend and MPI_Isend. How do they work ?

  - by GBBL

  Hi, using buffered send and non blocking send I was wondering how and if they implement a new level of parallelism in my application eventually generating a thread. Imagine that a slave process generates a large amount of data and want to send it to the master. My idea was to start a buffered or non blocking send then immediately begin to compute the next result. Just when I would have to send the new data I wold check if I can reuse the buffer. This would introduce a new level of parallelism in my application between CPU and communication. Does anybody knows how this is done in MPI ? Does MPI generate a new thread to handle the Bsend or Isend ? Thanks.

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• Efficiency: what block size of kernel-mode memory allocations?

  - by Robert

  I need a big, driver-internal memory buffer with several tens of megabytes (non-paged, since accessed at dispatcher level). Since I think that allocating chunks of non-continuous memory will more likely succeed than allocating one single continuous memory block (especially when memory becomes fragmented) I want to implement that memory buffer as a linked list of memory blocks. What size should the blocks have to efficiently load the memory pages? (read: not to waste any page space) A multiple of 4096? (equally to the page size of the OS) A multiple of 4000? (not to waste another page for OS-internal memory allocation information) Another size? Target platform is Windows NT = 5.1 (XP and above) Target architectures are x86 and amd64 (not Itanium)

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• current url javascript binding into html

  - by soField

  document.write("window.location.href");&layout=button_count&show_faces=true&width=450&action=like&font=arial&colorscheme=light&height=21" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:450px; height:21px;" allowTransparency="true" i am trying to bind current url of my page to this html how can i do that

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• Can't select database table even though the code is right

  - by Lisa

  I am trying to display a list of my vbulliten threads on a non-vbulliten portion of my site. However I can't select the vbulliten database: <?php $host = "localhost"; $user = "my username"; $pass = "my password"; $dbname = "tableprefix_forum"; mysql_connect($host, $user, $pass) or die ("Could not connect to database server."); mysql_select_db($dbname) or die ("Could not select database."); ?> I am substituting some things here in this example but all my credentials are correct including my db server username, password and forum db name. So what is the problem? Is it due to some internal security feature in vbulliten, does this system not allow you to connect to it's db if the page trying to connect to it is a non-vbulliten page?

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• CTRL+mouse wheel in gvim (windows) not paging

  - by andrew

  Hello, I'm loving vim, but one thing that's bugging me is that when I hold the control key and mouse wheel up or down, the window scrolls normally when the bindings are telling it to page up/down. I'm using the exact same vimrc file (and plugins) on one of my linux machines and the CTRL+mouse wheel does page up down (as opposed to just normally scrolling like in windows). Is there some way to force gvim to response to a ctrl+MouseUp/Down event? It seems to be ignoring it in windows ='[

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• Getting the most recent entry per group in a select statement

  - by TheObserver

  I have 3 tables to join to get table1.code, table1.series, table2.entry_date, table3.title1 and I'm trying to get the most recent non null table3.title1 grouped by table1.code and table1.series. select table1.code, table1.series, max(table2.entry_date), table3.Title1 from table3 INNER JOIN table2 ON table3.ID = table2.ID INNER JOIN table1 ON table2.source_code = table1.code where table3.Title1 is not NULL group by table1.code, table1.series, table3.Title1 seems to give me all entries with a non null title1 instead of the most recent one. How should I structure the query to just pick the newest version of Title1 per code & series?

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• hp-ux preserve owner of file with cpio

  - by soField

  i want to preserve file ownership when copying file with cpio on hp-ux can you help me i am running this command with non root user

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• Future of IE9: Opacity + Performance

  - by chris_l

  I just tried the IE9 "Second Internet Explorer Platform Preview" - which supports CSS opacity now. That's nice, but I tried it with one of my website prototypes, and it's quite slow when scrolling etc. Admittedly, the prototype uses hundreds of images with opacity != 1, but everything is snappy with current versions of Firefox, Safari, Chrome and Opera. Does anybody know, if there are plans for IE9 to become faster in this area? Even rumours about this would be interesting in this case.

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• why doesnt' nhibernate support this "exists in list" syntax ??

  - by ooo

  i have the following query and its failing in Nhibernate 3 LINQ witha a "Non supported" exception. Its similar to this question but this question was asked over a year ago so i am positive that the answer is out of date. My DB tables are: VacationRequest (id, personId) VacationRequestDate (id, vacationRequestId) Person (id, FirstName, LastName) My Entities are: VacationRequest (Person, IList) VacationRequestDate (VacationRequest, Date) Here is the query that is getting a "Non supported" Exception Session.Query<VacationRequestDate>() .Where(r => people .Contains(r.VacationRequest.Person, new PersonComparer())) .Fetch(r=>r.VacationRequest) .ToList(); is there a better way to write this that would be supported in Nhibernate? fyi . .the PersonComparer just compared person.Id

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• How to join by column name

  - by Daniel Vaca

  I have a table T1 such that gsdv |nsdv |esdv ------------------- 228.90 |216.41|0.00 and a table T2 such that ds |nm -------------------------- 'Non-Revenue Sales'|'ESDV' 'Gross Sales' |'GSDV' 'Net Sales' |'NSDV' How do I get the following table? ds |nm |val --------------------------------- 'Non-Revenue Sales'|'ESDV'|0.00 'Gross Sales' |'GSDV'|228.90 'Net Sales' |'NSDV'|216.41 I know that I can this by doing the following SELECT ds,nm,esdv val FROM T1,T2 WHERE nm = 'esdv' UNION SELECT ds,nm,gsdv val FROM T1,T2 WHERE nm = 'gsdv' UNION SELECT ds,nm,nsdv val FROM T1,T2 WHERE nm = 'nsdv' but I am looking for a more generic/nicer solution. I am using Sybase, but if you can think of a way to do this with other DBMS, please let me know. Thanks.

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