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• Simple Big O with lg(n) proof

  - by halohunter

  I'm attempting to guess and prove the Big O for: f(n) = n^3 - 7n^2 + nlg(n) + 10 I guess that big O is n^3 as it is the term with the largest order of growth However, I'm having trouble proving it. My unsuccesful attempt follows: f(n) <= cg(n) f(n) <= n^3 - 7n^2 + nlg(n) + 10 <= cn^3 f(n) <= n^3 + (n^3)*lg(n) + 10n^3 <= cn^3 f(n) <= N^3(11 + lg(n)) <= cn^3 so 11 + lg(n) = c But this can't be right because c must be constant. What am I doing wrong?

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• Git: How do I rewind the Master branch on the remote origin

  - by user277260

  I made 5 commits to Master branch when bug hunting on a private project and pushed them to the remote origin (my own private vps). Then I saw that commits 4 and 5 were going to cause trouble elsewhere and I need to undo them, so I checked out commit 3 again, made a new branch "Dev" from that point, and did a few more commits fixing the issue properly. Then I did git reset --hard HEAD~2 on Master to pull it back to the point that I branched Dev. Then I did git merge to fast forward Master back to the end of the Dev branch. So now I have a local repository, with Dev and Master both pointing to the same, up to date version of the project with the latest bug fix. Problem is, when I try to push the project now to the origin, it fails and gives me an error message: ! [rejected] master - master (non-fast forward) error: failed to push some refs to 'myserver...myproject.git' What have I done wrong, and how do I fix it? Thanks

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• Returning a list in this recursive coi function in python.

  - by Nate

  Hello. I'm having trouble getting my list to return in my code. Instead of returning the list, it keeps returning None, but if I replace the return with print in the elif statement, it prints the list just fine. How can I repair this? def makeChange2(amount, coinDenomination, listofcoins = None): #makes a list of coins from an amount given by using a greedy algorithm coinDenomination.sort() #reverse the list to make the largest position 0 at all times coinDenomination.reverse() #assigns list if listofcoins is None: listofcoins = [] if amount >= coinDenomination[0]: listofcoins = listofcoins + [coinDenomination[0]] makeChange2((amount - coinDenomination[0]), coinDenomination, listofcoins) elif amount == 0: return listofcoins else: makeChange2(amount, coinDenomination[1:], listofcoins)

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• Which is the 'correct' way to do this (if statement)

  - by frinkz

  I've got plenty of these lying around, and I'm wondering if I'm going to face any trouble - or performance problems. I have method A: MyClass monkey; ... if(monkey != null) { ... } Or method B: boolean hasMonkey; //This is set to TRUE when monkey is not null MyClass monkey; ... if(hasMonkey) { ... } On a functional level, they both do the same thing. Right now, I'm using method A. Is that a bad way of doing things? Which is going to perform better?

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• What are parts of a PHP function named?

  - by MikeG

  I am having trouble figuring out a problem and it is because I don't know the correct terms to be searching for. Could someone please name all the parts of a PHP function and if I'm missing something please add it. function my_function( non_variable $variable_one, $variable_two = "", $variable_three ) { /* inside stuff (Statement?) */ } The answer I'm looking for would look something like this function: declaration my_function: name non_variable: Please Answer $variable_one: variable filled with non_variable The one I really need to know about are non_variable and $variable_one, Thanks! EDIT: more detail about the function function my_function(custom_name $company) { $website = $company->company_website; /* Additional stuff */ }

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• PowerPoint API, how to change slide layout programmatically

  - by 112811688864492097861

  Hello, I'm working on PowerPoint Add-In and I was faced with trouble I couldn't solve myself. The point is I need to change the slide Layout programmaticaly with C# (the Add-In Express 2009 for Office and .NET is used). If the new layout is a predefined one everything is fine but I need to set a custom layout as a new one (without slide recreating). Unfortunately, I didn't find any information on how to do it, PowerPoint object model reference documentation didn't answer me as well. There is just the ability to create a new slide that uses custom layout. I've done an experiment seria and have ensured that the Slide object stayed being the same while I have been changing layout both predefined and custom ones. I don't want to create a new slide when I need just switch the layout. Is it possible at all? Please help me to find a way of doing it. Thanks in advance.

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• Need help searching a MySQL db using a SELECT DISTINCT result

  - by user1695645

  So I am new to MySQL and am having a bit of trouble. I have one table called book_genres and another called books. book_genres +-------+---------+ |book_id| genre | +-------+---------+ | 1 | Horror | | 1 | Comedy | | 2 | Romance | | 2 | Comedy | +-------+---------+ books +-------+---------+ |book_id| title | +-------+---------+ | 1 | A Book | | 2 | B Book | | 3 | C Book | +-------+---------+ I am using the following command to pull all the book_ids that have 3 selected genres: SELECT DISTINCT a.book_id, b.genre AS genre1, c.genre AS genre2, d.genre AS genre3 FROM book_genres a JOIN book_genres b ON a.book_id = b.book_id AND b.genre LIKE 'Romance' JOIN book_genres c ON a.book_id = c.book_id AND c.genre LIKE 'Action' JOIN book_genres d ON a.book_id = d.book_id AND d.genre LIKE 'Comedy' GROUP BY book_id What I want to do is now pull all of the book titles from the books table using the book_ids found in this search. I'm not sure if there is an easier way to do this or not, but this was all that I could come up with. Thank you for anyone who can help!

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• Correct folder structure for sites

  - by Francesca

  I've just started tidying up the server for a particular site and am running into some trouble when moving files. I originally had style.css in my main folder, and another folder called images, so paths in the .css went images/myimage.png Now I have moved style.css into another folder called css. So the image links in the CSS no longer work, as it's looking for the folder images from it's own CSS folder. I changed the file path to /images/myimage.png as I thought this would make it climb up a level and then look for the images folder, but this doesn't seem to work. I'm interested to see what solutions people have and also any suggestions on how people organise their folders for a particular site. Thanks!

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• In Drupal, can you control block display according to e.g. number of URL parts?

  - by james6848

  I'm having a little trouble controlling page-specific block display in Drupal... My URL's will be of this typical structure: http://www.mysite.co.uk/section-name/sub-page/sub-sub-page The 'section-name' will effectively be fixed, but there will be many sub-pages (far too many to explicitly reference). I need to somehow control block display as follows: One block will show on all pages where URL contains 'section-name/sub-page' but not on pages 'section-name/sub-page/sub-sub-page' Conversely, another block will show on all pages where URL contains 'section-name/sub-page/sub-sub-page' but not on pages 'section-name/sub-page' My only idea is to do a bit of PHP that looks for the string 'section-name' and then also counts URL parts (or even the number of slashes). Not sure how to implement that though :) Your help would be appreciated!

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• Sending JSON content type in from JavaScript objects ( jQuery ajax )

  - by smartnut007

  I am having trouble sending JavaScript objects as a http request that only accepts json content-type. i.e "application/json" or "text/json" But, I am not sure why data2 ( stringified json ) works fine But, data1 ( json object ) does throws 400 ( Bad Request ). i.e I am not sure jQuery does not serialize the json object to a valid json string for the server to process. var data1 = ({ rating : 3 }); //does not work var data2 = '{ "rating" : 3}'; //works fine $.ajax({ url : "/rate", data : data1, type : "POST", contentType: "application/json", success: function(json){ console.log("Ajax Return :"+json); } });

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• How can I find all records for a model without doing a long list of "OR" conditions?

  - by gomezuk

  I'm having trouble composing a CakePHP find() which returns the records I'm looking for. My associations go like this: User -(has many)- Friends , User -(has many)- Posts I'm trying to display a list of all a user's friends recent posts, in other words, list every post that was created by a friend of the current user logged in. The only way I can think of doing this is by putting all the user's friends' user_ids in a big array, and then looping through each one, so that the find() call would look something like: $posts = $this->Post->find('all',array( 'conditions' => array( 'Post.user_id' => array( 'OR' => array( $user_id_array[0],$user_id_array[1],$user_id_array[2] # .. etc ) ) ) )); I get the impression this isn't the best way of doing things as if that user is popular that's a lot of OR conditions. Can anyone suggest a better alternative?

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• How to call C++ function from C?

  - by claws

  I know this. Calling C function from C++: If my application was in C++ and I had to call functions from a library written in C. Then I would have used //main.cpp extern "C" void C_library_function(int x, int y);//prototype C_library_function(2,4);// directly using it. This wouldn't mangle the name C_library_function and linker would find the same name in its input *.lib files and problem is solved. Calling C++ function from C??? But here I'm extending a large application which is written in C and I need to use a library which is written in C++. Name mangling of C++ is causing trouble here. Linker is complaining about the unresolved symbols. Well I cannot use C++ compiler over my C project because thats breaking lot of other stuff. What is the way out? By the way I'm using MSVC

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• Unable to Access UILabel in UITableViewCell

  - by Nirmal

  I am having trouble in accessing which is in the UITableViewCell, that i have placed in my main .xib file. That Label is connected to IBOutlet servicesCell. And the Label inside the table view cell is connected through IBOutlet serviceLabel. At runtime i am not getting the text which i am assining to that label. Following is my sample code for that. static NSString *ServiceIdentifier = @"ServiceIdentifier"; UITableViewCell *cell1 = [tableView dequeueReusableCellWithIdentifier:ServiceIdentifier]; if(cell1 == nil) { [[NSBundle mainBundle] loadNibNamed:@"servicesCell" owner:self options:nil]; cell1 = servicesCell; } // label access serviceLabel = (UILabel *)[cell1 viewWithTag:1]; serviceLabel.numberOfLines = 3; serviceLabel.lineBreakMode = UILineBreakModeWordWrap; [serviceLabel setTextAlignment:UITextAlignmentLeft]; [serviceLabel setText:@"Testing String"]; Anyone have any idea then please help.. Thanks in advance..

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• IE 7 can't bind event (using .live()) to dynamically created element using .load()

  - by petron

  Hi All - I'm having trouble getting IE7 to keep a click event bound to an element that is added to the DOM using .load(). Here's some code: $('.mybtn').live('click', function(e){ e.preventDefault(); $('#mypage').load('load-this-page.htm'); }); And here's the html <div id="mypage"> <a href="#" class="mybtn">clickme</a> // stuff goes here </div> On page load the click works but once the div is loaded via the clickme link the click stops working in IE7. The clickme link is within the div on load and also within the load() loaded html file that's why I'm using live(). This code works in FF 3.6, fyi. Anyone have any idea what's up (besides the fact the IE sucks balls)? Thanks!

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• Is there any memory restrictions on an ASP.Net application? HttpHandler?

  - by tpower

  I have an ASP.Net MVC application that allows users to upload images. When I try to upload a really large file (400MB) I get an error. I assumed that my image processing code (home brew) was very inefficient, so I decided I would try using a third party library to handle the image processing parts. Because I'm using TDD, I wanted to first write a test that fails. But when I test the controller action with the same large file it is able to do all the image processing without any trouble. The error I get is "Out of memory". I'm sure my code is probably using a lot more memory than it needs to but I just want to know why my test passes. The other difference is that I'm using SWFUpload which is not used with the test. Could this be the cause?

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• Javascript How do I force a string + variable to be evaluated as a variable

  - by Craig Rinde

  Im not even sure how to word this and is probably why I am having trouble finding an answer in google. When the code is run currentCardRow will equal 1 therefore it should be cardSelected1 which is what is shown in the console.log. I need it to go a step further because cardSelected1 is a variable and I need it to evaluate show in the console log as Invitation. Invitation is an example of a variable for cardSelected1. I am not sure on what the correct syntax is to make this happen. var currentCardSelected = "cardSelected" + currentCardRow; Thanks for your help!

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• Python - a clean approach to this problem?

  - by Seafoid

  Hi, I am having trouble picking the best data structure for solving a problem. The problem is as below: I have a nested list of identity codes where the sublists are of varying length. li = [['abc', 'ghi', 'lmn'], ['kop'], ['hgi', 'ghy']] I have a file with two entries on each line; an identity code and a number. abc 2.93 ghi 3.87 lmn 5.96 Each sublist represents a cluster. I wish to select the i.d. from each sublist with the highest number associated with it, append that i.d. to a new list and ultimately write it to a new file. What data structure should the file with numbers be read in as? Also, how would you iterate over said data structure to return the i.d. with the highest number that matches the i.d. within a sublist? Thanks, S :-)

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• Getting redefinition of View Controller pickerView:titleForRow:forComponent error

  - by pdenlinger

  Hi-- I'm working my way through the book Head First iPhone Development (O'Reilly). Am having trouble on page 68 with the following method and function; I get the error "redefinition of ViewController pickerView:titleForRow:forComponent error. Have checked the code for spaces; seems to be OK. Can you check the code and tell me what's wrong? Thank you. -(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent: (NSInteger)component{ switch (component) { case 0: return [activities objectAtIndex:row]; case 1: return [feelings objectAtIndex:row]; } return nil; }

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• Facebook "->api" permissions

  - by Matthieu Marcé

  I have trouble using Facebook auth on my website... I'm using the PHP Sdk and I don't understand why I can use some functions like "getLoginUrl"/"getLoginStatusUrl"/"getUser" (with right answers : the facebook session is started, i get the user's facebook ID) and when I want to use something like $me = $facebook->api("/me/permissions"); or just $me = $facebook->api("/me"); there's always an exception and nothing works ... I guess it has something to do with permissions or token maybe, but I don't know what. When the user sign up on my website, I ask permissions I need with this scope : "email,user_about_me,user_location,read_friendlists,publish_stream" A clue that the permissions seem to be ok is that when the exception occures, I ask the user to sign in again (facebook connect) and no window appears as if everything's ok, but still, the page is reloaded and the exception appears again and again... Please help, Thank you !

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• defualt parameter values in arguments and inheritance

  - by sil3nt

  Hello there, Im having trouble with some Java, How do I give in default parameter values in java?. for example I have this in c++ DVD(int i, string t, int y, string d="Unknown"): Items(i,t,y),director(d){} and in Java I tried public Dvd(int i, String t,int y, String d="Unknown"){ super(i,t,y); director = d; } which fails to build. So how do I go about giving in default values? also In my main testing class I tried giving in 3 arguments insead of 4 but this fails also. How do I get around this problem?.

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• .htaccess Problem

  - by ocergynohtna

  I'm having trouble with redirecting urls using the .htaccess file. This is how my htaccess file looks like: Redirect 301 /file-name/example.php http://www.mysite.com/file-name/example-001.php Redirect 301 /section-name/example.php http://www.my-site.com/section-name/example-002.php RewriteEngine on RewriteCond %{HTTP_HOST} !^www.mysite.com$ [NC] RewriteRule ^(.*)$ http://www.mysite.com/$1 [L,R=301] RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.+)/(.*)$ hqtemplates/articles.php?file_name=$2 [L] php_value session.use_only_cookies 1 php_value session.use_trans_sid 0 Now the problem is that when I go to page: www.my-site.com/file-name/example.php instead of redirecting me to www.my-site.com/file-name/example-001.php it redirects me to www.my-site.com/file-name/example.php?file_name=example-001.php. For some reason it adds "?file_name=example-001.php" to the url. Anyone know's why this is happening and how to fix this?

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• How to seperate database entries and display them as individual records using PHP?

  - by Clark

  I used to have database entries separated by ampersands (&), but this was causing certain search issues so I decided to encapsulate my entries on both sides by $ and & symbols like: $this& But I am having trouble displaying all the entries of a cell as indiivdual records. Before I used: $unsplitItems = $row['files']; $files = explode("@", $unsplitItems); foreach ($files as $file) { if(strlen($file)) { echo "<li>$file</li>"; } } Any idea how I can split my records and display all the items in the array as individual entries?

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• Keeping track of threads when creating them recursively

  - by 66replica

  I'm currently working on some code for my Programming Languages course. I can't post the code but I'm permitted to talk about some high level concepts that I'm struggling with and receive input on them. Basically the code is a recursive DFS on a undirected graph that I'm supposed to convert to a concurrent program. My professor already specified that I should create my threads in the recursive DFS method and then join them in another method. Basically, I'm having trouble thinking of how I should keep track of the threads I'm creating so I can join all of them in the other method. I'm thinking an array of Threads but I'm unsure how to add each new thread to the array or even if that's the right direction.

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• IE 7 CSS problem with detecting mouse over on div

  - by BeaverProj

  I have a div inside an li as part of a top navigation for a website. I'm having trouble with IE 7 having "holes" in the box such that the drop down disappears when the user is still on the drop down. I started with a pure CSS solution (li:hover) and that works awesome in all browsers except IE 7. So I've now added a jQuery/javascript solution to detect when the mouse enters and exits the nav li and then add a class to show the drop down. It works better, but if the mouse is not over an image, p, h3, or a tag then it doesn't think I'm over the div that is the drop down. Very frustrating. I can post some test code, but the issue can be viewed here: http://davincidays.org/ Anyone have any ideas? I've been working on this for waaaay too long already and need some fresh things to try.

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• How do I fix this warning in my mx:request tag?

  - by invertedSpear

  I'm running an HTTPService with the following request: <mx:request xmlns=""> <view>{myViewStack.selectedChild.name}</view> </mx:request> The idea being to pass which child is selected on the viewstack to the php page, and then get that back so I can run some logic based on which child of the viewstack was selected at the time. Everything seems to work, but I get the following warning: Data binding will not be able to detect assignments to "name". This doesn't seem to be causing any trouble, but I know warnings usually mean that I am not following the best practice. How can I fix this? I don't really need this item to be bound, because the name will never change at runtime, but I don't know how else to include it in the request.

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