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• using Excel VBA, given the daily price of 50 stocks, choose 10 stocks such that they have the minumu

  - by correl

  The high-level goal is to choose 10 stocks that have the lowest correlation among one another, out of a pool of 50, so that I can have a well-diversified portfolio. I have managed to write some VBA macro to download the past 3 years of daily price data from Yahoo finance, and then compute the 50x50 correlation matrix (using the Correl function), using the daily close as the data. What I have tried so far is just some local-maximum heuristic: - For the two stocks that have the highest correlation with each other, remove one of them. Between the two, remove the one that has the higher average correlation with all the other stocks. - When I remove a stock from the pool, I just delete the correponding row and column, to give a smaller matrix. - Repeat until I have just 10 stocks remaining (a 10x10 matrix). I was wondering if there is some algorithm that already solves such a problem and gives the optimum solution?

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• ruby on rails named scope implementation

  - by Engwan

  From the book Agile Web Development With Rails class Order < ActiveRecord::Base named_scope :last_n_days, lambda { |days| {:conditions => ['updated < ?' , days] } } named_scope :checks, :conditions => {:pay_type => :check} end The statement orders = Orders.checks.last_n_days(7) will result to only one query to the database. How does rails implement this? I'm new to Ruby and I'm wondering if there's a special construct that allows this to happen. To be able to chain methods like that, the functions generated by named_scope must be returning themselves or an object than can be scoped further. But how does Ruby know that it is the last function call and that it should query the database now? I ask this because the statement above actually queries the database and not just returns an SQL statement that results from chaining.

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• Loading HTML into <div> with jQuery-ajax

  - by ehehhh

  Hello everyone, I ran into a bit of trouble while trying to load an external HTML page into a div using jQuery-ajax. I had this div: <div id="content"></div> and wanted to fill it with $("#content").load("include/add.html"); It loads the HTML file perfectly, but inside that add.html is a button that should load add2.html(also using .load), but it seems that neither the button nor the datepicker in that file won't work. I'm guessing the .load function is responsible for that? This is the content of add2.html: <p>Nr: <input type="text"></input></p> <p>Name: <input type="text"></input></p> <p>Date: <input type="text" id="datepicker"></input></p> <a href="#" id="button1">Next</a> Please help, I'm desperate :D

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• Trying to integrate Jeditable+MarkItUp and Thickbox/Lightbox

  - by Bob Sawyer

  I've managed to successfully integrate MarkItUp with Jeditable based on the instructions on those two sites. What I would really like to do, however, is to have the Jeditable/MarkItUp editing window appear in a Thickbox or Lightbox overlay. So far my attempts to do this have not been successful. So, at the moment, I have the standard code: $.editable.addInputType('markitup', { element : $.editable.types.textarea.element, plugin : function(settings, original) { $('textarea', this).markItUp(settings.markitup); } }); $(".editme").editable("/content/save", { event : 'dblclick', type : 'markitup', submit : 'OK', cancel : 'Cancel', width : 640, height : 'auto', tooltip : 'Double-click to edit...', onblur : 'ignore', markitup : mySettings }); I've found other posts here that show how to trigger the edit box by clicking on a link rather than the object itself, and I've tried integrating that with the Thickbox calls, to no avail. Would appreciate anyone pointing me in the right direction. Thanks!

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• jQuery: How to disable tooltip

  - by epitka

  Is there a way to disable browser tooltip from displaying when hovering over elements that have attribute 'title' populated? Note that I don't want to remove title content. Here is the code are requested: $(document).ready(function() { $('a.clickableSticky').cluetip({ splitTitle: '|', showTitle: false, titleAttribute: 'description', activation: 'click', sticky: true, arrows: true, closePosition: 'title' }); }); and in asp.net <ItemTemplate> <a class="clickableSticky" href="#" title=' <%#((Limit)Container.DataItem).Tip %>'> <img src="..\App_Themes\default\images\icons\information.png"/> </a> </ItemTemplate>

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• Helper Casting Functions -- Is it a code smell?

  - by Earlz

  I recently began to start using functions to make casting easier on my fingers for one instance I had something like this ((Dictionary<string,string>)value).Add(foo); and converted it to a tiny little helper function so I can do this ToDictionary(value).Add(foo); Is this a code smell? Also, what about simpler examples? For example in my scripting engine I've considered making things like this ((StringVariable)arg).Value="foo"; be ToStringVar(arg).Value="foo"; I really just dislike how inorder to cast a value and instantly get a property from it you must enclose it in double parentheses. I have a feeling the last one is much worse than the first one though (also I've marked this language agnostic even though my example is C#)

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• Microsoft SQL 2005 - using the modulo operator

  - by cc0

  So I have a silly problem, I have not used much MSSQL before, or any SQL for that matter. I basically have a minor mathematical problem that I need solved, and I thought modulo would be good. I have a number of dates in the database, but I need them be rounded off to the closest [dynamic integer] (could be anything from 0 to 5000000) which will be input as a parameter each time this query is called. So I thought I'd use modulo to find the remainder, then subtract that remainder from the date. If there is a better way, or an integrated function, please let me know! What would be the syntax for that? I've tried a lot of things, but I keep getting error messages like integers/floats/decimals can't be used with the modulo operators. I tried casting to all kinds of numeric datatypes. Any help would be appreciated.

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• Formatting the date in unix to include suffix on day (st, nd, rd and th)

  - by skymook

  How can I add the suffix on the day number of a unix date? I'll explain. I have a TextMate bundle snippit that writes out today's date. It uses unix date and formatting. Here is the code: `date +%A` `date +%d` `date +%B` `date +%Y` It outputs: Monday 22 March 2010 I would like to add the suffix to the day (st, nd, rd and th) like so: Monday 22nd March 2010 As far as I can see, there is no native function in the unix date formatting, like there is in PHP (j). How would I achieve this in unix? A complicated regex on the day number?

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• compare two windows paths, one containing tilde, in python

  - by Steve Cooper

  I'm trying to use the TMP environment variable in a program. When I ask for tmp = os.path.expandvars("$TMP") I get C:\Users\STEVE~1.COO\AppData\Local\Temp Which contains the old-school, tilde form. A function I have no control over returns paths like C:\Users\steve.cooper\AppData\Local\Temp\file.txt My problem is this; I'd like to check if the file is in my temp drive, but I can't find a way to compare them. How do you tell if these two Windows directories; C:\Users\STEVE~1.COO\AppData\Local\Temp C:\Users\steve.cooper\AppData\Local\Temp are the same?

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• jQuery animation works in IE8, not in Firefox or Webkit

  - by Don

  My CSS: #content { border: 2px solid #4190d4; padding: 220px; background-color: #282828; margin-top: 65px; -moz-border-radius: 8px; -webkit-border-radius: 8px; } My jQuery: $("#header a").click(function() { $('#content').animate({padding: 300}, 500); } This code works perfectly fine in IE8, my #content div grows from 220px to 300px. In Firefox or Webkit-based browsers, though, my #content div first shrinks to 0px and then resizes to 300px. I'm using jQuery 1.4.2, Firefox 3.6 and Chrome 4.0.249.89. Any ideas?

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• A way to measure performance

  - by Andrei Ciobanu

  Given Exercise 14 from 99 Haskell Problems: (*) Duplicate the elements of a list. Eg.: *Main> dupli''' [1..10] [1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10] I've implemented 4 solutions: {-- my first attempt --} dupli :: [a] -> [a] dupli [] = [] dupli (x:xs) = replicate 2 x ++ dupli xs {-- using concatMap and replicate --} dupli' :: [a] -> [a] dupli' xs = concatMap (replicate 2) xs {-- usign foldl --} dupli'' :: [a] -> [a] dupli'' xs = foldl (\acc x -> acc ++ [x,x]) [] xs {-- using foldl 2 --} dupli''' :: [a] -> [a] dupli''' xs = reverse $ foldl (\acc x -> x:x:acc) [] xs Still, I don't know how to really measure performance . So what's the recommended function (from the above list) in terms of performance . Any suggestions ?

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• Can you clear jquery ajax cache?

  - by chobo2

  Hi I am wondering is it possible to clear the cache from a particular ajax method? Say if I have this $.ajax({ url: "test.html", cache: true, success: function(html){ $("#results").append(html); } }); Now 99% of the time a cached result can be used since it should always be same content. However if a user updates this content it of course changes. If it is cached and it would still show the old content. So it would be cool if I could pick out this cache for this method and clear it and all other cached stuff would stay. Can this be done?

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• Parse error: syntax error, unexpected T_DOUBLE_ARROW PHP

  - by Belgin Fish

  I'm getting a Parse error: syntax error, unexpected T_DOUBLE_ARROW PHP on line 47, which is 'post_content' => $thisShow['content'], Anyone got any ideas why? protected function _saveShow($thisShow) { $saveData = array( 'mid' => $this->_saveAsUserId, 'post_title' => $thisShow['title'], 'post_name' => slug($thisShow['title'], 'post_content' => $thisShow['content'], 'post_date' => date('Y-m-d H:i:s'), 'post_date_gmt' => date('Y-m-d H:i:s'), 'category_id' => 4, 'post_author' => 0, 'category_name' => $thisShow['category_name'] ); // $this->_database->insert('wp_posts', $saveData); }

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• jquery write protection in textarea for wildcards

  - by Juri

  Hi everybody. Does anyone know a possibilty to protect a string-wildcard from changing in a textarea? HTML: <textarea name="mail_text" id="mail_text"> {salutation} {recipient}, thanks for your email. Regards {username} </textarea> I would like to catch when someone tries to change one of the wildcards: {salutation},*{recipient}* and {username} $("textarea").keyup(function() { var val = $(this).val(); //protect the wildcards }); Thanks!

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• FLEX: I lose current datagrid selection if I sort differently the items of its dataProvider.

  - by Patrick

  hi, when I sort differently my datagrid items, I lose the current selection. This is the code. I'm using savedSelectedItems array to restore the selectedItems but it doesn't work. How can I save the current selection. private function sortItems(option:String):void { //save selectedItems savedSelectedItems = tagsList.selectedItems; if (option == "tag") sort.fields = [new SortField("tag",true)]; if (option == "popularity") sort.fields = [new SortField("popularity",true)]; fullTagsDataModel.tagsData.sort = sort; fullTagsDataModel.tagsData.refresh(); tagsList.selectedItems = savedSelectedItems; } ... <!-- tags list --> <dataGrid:CheckBoxList id="tagsList" width="100%" height="100%" initialize="tagsList.dataProvider=fullTagsDataModel.tagsData" labelField="tag" itemRenderer="com.CheckBoxListAndDataGrid.CheckBoxRenderer" allowMultipleSelection="true" click="savedSelectedItems = tagsList.selectedItems" />

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• RadioButtonList confirm SelectedIndexChange

  - by Brian David Berman

  I have a RadioButtonList control and I would like to do a Javascript "confirm" when a user tries to change the index. Currently AutoPostBack is set to TRUE. I can, of course, just call __doPostBack from within a javascript function, etc. I tried a few things with jQuery but you have to worry about mousedown vs. click and then there is always the fact that you can click the checkbox label to select it, etc. Anyone have a nice solution for this? To be clear, I am looking for a way to prompt the user with a confirm box prior to their selection being made and triggering a postback.

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• Best practices for organizing .NET P/Invoke code to Win32 APIs

  - by Paul Sasik

  I am refactoring a large and complicated code base in .NET that makes heavy use of P/Invoke to Win32 APIs. The structure of the project is not the greatest and I am finding DllImport statements all over the place, very often duplicated for the same function, and also declared in a variety of ways: The import directives and methods are sometimes declared as public, sometimes private, sometimes as static and sometimes as instance methods. My worry is that refactoring may have unintended consequences but this might be unavoidable. Are there documented best practices I can follow that can help me out? My instict is to organize a static/shared Win32 P/Invoke API class that lists all of these methods and associated constants in one file... (The code base is made up of over 20 projects with a lot of windows message passing and cross-thread calls. It's also a VB.NET project upgraded from VB6 if that makes a difference.)

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• google book api

  - by ohana

  hi, i need to add google's book preview button in my web app. I tried Google Book Search APIs, and used their dynamic links, and added the following in my jquery code: var cburl = "http://books.google.com/books"; var api_url = cburl + "?jscmd=viewapi&bibkeys=" + "0321525566"; document.write(unescape("%3Cscript src=" + api_url + " type='text/javascript'%3E%3C/script%3E")); from firebug, i can see google responsed: var _GBSBookInfo = {"0321525566":{"bib_key":"0321525566","info_url":"http://books.google.com/books?id=VBRePgAACAAJ\u0026source=gbs_ViewAPI","preview_url":"http://books.google.com/books?id=VBRePgAACAAJ\u0026cd=1\u0026source=gbs_ViewAPI","thumbnail_url":"http://bks4.books.google.com/books?id=VBRePgAACAAJ\u0026printsec=frontcover\u0026img=1\u0026zoom=5\u0026sig=ACfU3U2i79GUit7BKFSvfvuZ1daX4EpZjg","preview":"noview","embeddable":false}}; however jquery complaint 'No _GBSBookInfo is defined'. then i tried jquery's ajax as blow instead of Document.write(): $.ajax({ url:api_url, success: function(_GBSBookInfo) { alert(_GBSBookInfo); alert('load was performed'); } }); still got the same complaint...anyone can help?

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• Extrapolation using fft in octave

  - by CFP

  Using GNU octave, I'm computing a fft over a piece of signal, then eliminating some frequencies, and finally reconstructing the signal. This give me a nice approximation of the signal ; but it doesn't give me a way to extrapolate the data. Suppose basically that I have plotted three periods and a half of f: x -> sin(x) + 0.5*sin(3*x) + 1.2*sin(5*x) and then added a piece of low amplitude, zero-centered random noise. With fft/ifft, I can easily remove most of the noise ; but then how do I extrapolate 3 more periods of my signal data? (other of course that duplicating the signal). The math way is easy : you have a decomposition of your function as an infinite sum of sines/cosines, and you just need to extract a partial sum and apply it anywhere. But I don't quite get the programmatic way... Thanks!

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• Explain Python extensions multithreading

  - by Checkers

  Python interpreter has a Global Interpreter Lock, and it is my understanding that extensions must acquire it in a multi-threaded environment. But Boost.Python HOWTO page says the extension function must release the GIL and reacquire it on exit. I want to resist temptation to guess here, so I would like to know what should be GIL locking patterns in the following scenarios: Extension is called from python (presumably running in a python thread). And extension's background thread calls back into Py_* functions. And a final question is, why the linked document says the GIL should be released and re-acquired?

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• ANTLR parser hanging at proxy.handshake call

  - by Peter Boughton

  I am attempting to get a basic ECMAScript parser working, and found a complete ANTLR grammar for ECMAScript 3, which appears to compile ok and produces the appropriate Lexer/Parser/Walker Java files. (Running inside ANTLR IDE plugin for Eclipse 3.5) However, when actually trying to use it with some simple test code (following guide on ANTLR wiki), it just hangs when trying to create the parser: CharStream MyChars = new ANTLRFileStream(FileName); // FileName is valid ES3Lexer MyLexer = new ES3Lexer(MyChars); CommonTokenStream MyTokens = new CommonTokenStream(MyLexer); MyTokens.setTokenSource(MyLexer); ES3Parser MyParser = new ES3Parser( MyTokens ); // hangs here ES3Parser.program_return MyReturn = MyParser.program(); I've tracked down the problem to inside the ES3Parser constructor, where it's calling the function proxy.handshake() - before this line I can successfully do System.out.println("text") but after it I get nothing. So, how do I go about finding out why it's hanging, and stopping it - or even just bypassing this section (can/should I disable debugging?) - so long as that lets it work and allows me to get on with doing useful stuff.

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• How to tell if a datareader is open on a connection and close it

  - by Earlz

  Hi, I'm setting up a little thing for connection pooling and on of the more common bugs that we have occur(its always an easy fix, but we just can't remember reader.Close()!) it is when we have a connection that is used by a lot of classes/methods and one method opens a data reader and forgets to close it. This isn't really bad cause a lot of times all you have to do is go into the debugger and go up one level and see the function before it was and check if it had an unclosed data reader. Now, here is the bigger problem. In this connection pool, if a datareader is open, then it's not known until a thread gets a connection and tries to use it and the thing that originally opened the data reader may no longer even be alive. So quite simply, how can you detect if a data reader is open on a connection and is there a way to close the reader without closing the connection?

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• javascript hide/unhide, but want an arrow to point down/up on hide/unhide

  - by user1305810

  I have a simple hide/unhide div section using simple JavaScript. I need to have an arrow image, which will toggle the content visibility when clicked, and I want the little arrow to toggle between right/down positions when the content is hidden and unhidden. HTML content: <a href="javascript:showOrHide();"><img src="Image_Files/Copyright.png" alt="BioProtege Inc" border="0" /></a> <img src="Image_Files/Copyright_Arrow_Hidden.png" alt="Arrow" border="0" /> <div id="showorhide"> Copyright 2012+ BioProtege-Inc.Net | LG Fresh Designz <br /> Contact Us @ [email protected] </div> JavaScript content: function showOrHide() { var div = document.getElementById("showorhide"); if (div.style.display == "block") { div.style.display = "none"; } else { div.style.display = "block"; } }

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• asp.net mvc form add comment

  - by Pinu

  I have a page where a product appears on the right side and the user can add comment so i have a user control which gets all the comments and a small text area where user can add new comment for that product. the link of the page is like http://localhost/Product/TestComment/1 Where 1 indicates the id of the product and I have been hard coding my AddNote function below and fourth argument you see has been hard coded, but i need to pass that as the id of the product. How do i do this AddNote(HttpContext.User.Identity.ToString(), txtComment, 1, DateTime.Now, true); [AcceptVerbs(HttpVerbs.Post)] public ActionResult AddComment(string txtComment) { bool rst = _NotesService.AddNote(HttpContext.User.Identity.ToString(), txtComment, 1, DateTime.Now, true); return RedirectToAction("TestComment"); }

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• Qt - activate window

  - by Ockonal

  Hello, i have a QMainWindow. It has this parameters: this->setWindowFlags(Qt::Tool); this->setFocusPolicy(Qt::StrongFocus); this->setAttribute(Qt::WA_QuitOnClose,true); After showEvent calles my window is shown but unactivated. I tried to overload show function: ... QMainWindow::showEvent(event); this->activateWindow(); ... But it doesn't help me. EDIT: When i commented line this->setWindowFlags(Qt::Tool); everything worked fine, but i need in tool-flag. Any ideas? EDIT: OS: Linux Programming language: c++ Qt version: 4.5.1

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