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  • Lazy evaluation in Ruby

    - by fifigyuri
    I have a situation for Ruby, where an object is possibly necessary to be created, but it is not sure. And as the creation of the object might be costly I am not too eager creating it. I think this is a clear case for lazy loading. How can I define an object which is not created only when someone sends a message to it? The object would be created in a block. Is there a way for simple lazy loading/initialisation in Ruby? Are these things supported by some gems, which provide different solutions for various cases of lazy initialisation of objects? Thanks for your suggestions!

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  • Encrypt/Decrypt SQLite-database and use it "on the fly"

    - by Berschi
    Here's the thing: In my Qt4.6-Project, I use a SQLite-Database. This database shouldn't be unencrypted on my harddrive. So I want, that on every start of my program, the user gets asked to enter a password to decrypt the database. Of course the database never should appear "in clear" (not encrypted) on my harddrive. So is there any possibility to decrypt a SQLite-database "on the fly" and read and write data? What algorithm is here the best (maybe AES)? When it's not possible (or very slow), maybe it's better to encrypt every string in the database and decrypt the string when the password was right (so that a user could open the database, but has no clue what all the entrys could mean)?

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  • Can SqlAnywhere's UltraLiteJ DB tables be viewed in the Database Explorer of the Eclipse IDE

    - by Tobias
    Hi, I am developing a Blackberry app which should be able to access a DB. Here is my development environment and the tools I am using: Eclipse (Galileo) IDE with the Blackberry plugin installed. Blackberry OS 5.0 SQLAnywhere's DB 11 with UltraLiteJ (I am targeting Blackberrys running OS 4.1 and above) I have successfully executed a sample project for building a Blackberry application that uses the UltraLiteJ DB, following the tutorial in the UltraLiteJ documentation*. The tutorial creates, populates and retrieves data from the DB using java code. Now, I want to be able to access the tables and view data in them from the Eclipse IDE. Something similar to the FireFox plugin for SqlLite or say the Enterprise Manager for Sql Server 2005 which is a DB Explorer providing access to the StoredProcedures, Views, DB Diagrams etc. for a Database. Can someone please direct me as to how to tackle this problem? I hope the question is descriptive and clear. Much Obliged. *http://dcx.sybase.com/index.html#1101en/ulj_en11/uj-ch03.html

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  • Sliding a div across to left and the next div appears

    - by littleMan
    I have this form Im creating and when you click on the "Next" button I want to slide the next form() across to the left this is my function jQuery('input[name^=Next]').click(function () { current.animate({ marginLeft: -current.width() }, 750); current = current.next(); }); That function isn't working the way I want to. it slides the text in the container across not the whole container it could be a css problem for all I know. And my form which has a class name .wikiform doesn't center horizontally. here is my full code. I'm not that experience in javascript so you would be appreciated. cut and paste and try it out <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" /> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <script type="text/javascript" language="javascript" src="Scripts/jquery-1.4.4.js"></script> <script type="text/javascript" language="javascript" src="Scripts/jquery-easing.1.2.pack.js"></script> <script type="text/javascript" language="javascript"> (function ($) { $.fn.WikiForm = function (options) { this.Mode = options.mode || 'CancelOk' || 'Ok' || 'Wizard'; var current = jQuery('.wikiform .view :first'); function positionForm() { //jQuery('.wikiform').css( {'top': jQuery('body') .css('overflow-y', 'hidden'); jQuery('<div id="overlay"></div>') .insertBefore('.wikiform') .css('top', jQuery(document).scrollTop()) .animate({ 'opacity': '0.8' }, 'slow'); jQuery('.wikiform') .css('height', jQuery('.wikiform .wizard .view:first').height() + jQuery('.wikiform .navigation').height()) .css('top', window.screen.availHeight / 2 - jQuery('.wikiform').height() / 2) .css('width', jQuery('.wikiform .wizard .view:first').width()) .css('left', -jQuery('.wikiform').width()) .animate({ marginLeft: jQuery(document).width() / 2 + jQuery('.wikiform').width() / 2 }, 750); jQuery('.wikiform .wizard') .css('overflow', 'hidden') .css('height', jQuery('.wikiform .wizard .view:first').height() ); } if (this.Mode == "Wizard") { return this.each(function () { var current = jQuery('.wizard .view :first'); var form = jQuery(this); positionForm(); jQuery('input[name^=Next]').click(function () { current.animate({ marginLeft: -current.width() }, 750); current = current.next(); }); jQuery('input[name^=Back]').click(function () { alert("Back"); }); }); } else if (this.Mode == "CancelOk") { return this.each(function () { }); } else { return this.each(function () { }); } }; })(jQuery); $(document).ready(function () { jQuery(window).bind("load", function () { jQuery(".wikiform").WikiForm({ mode: 'Wizard', speed:750, ease:"expoinout" }); }); }); </script> <style type="text/css"> body { margin:0px; } #overlay { background-color:Black; position:absolute; top:0; left:0; height:100%; width:100%; } .wikiform { background-color:Green; position:absolute; } .wikiform .wizard { clear: both; } .wizard { position: relative; left: 0; top: 0; width: 100%; list-style-type: none; } .wizard .view { float:left; } .view .form { } .navigation { float:right; clear:left } #view1 { background-color:Aqua; width:300px; height:300px; } #view2 { background-color:Fuchsia; width:300px; height:300px; } </style> <title></title> </head> <body><form action="" method=""><div id="layout"> <div id="header"> Header </div> <div id="content" style="height:2000px"> Content </div> <div id="footer"> Footer </div> </div> <div id="formView1" class="wikiform"> <div class="wizard"> <div id="view1" class="view"> <div class="form"> Content 1 </div> </div> <div id="view2" class="view"> <div class="form"> Content 2 </div> </div> </div> <div class="navigation"> <input type="button" name="Back" value=" Back " /> <input type="button" name="Next " class="Next" value=" Next " /> <input type="button" name="Cancel" value="Cancel" /> </div> </div></form></body></html>

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  • How to calculate real-time stats?

    - by Diego Jancic
    I have a site with millions of users (well, actually it doesn't have any yet, but let's imagine), and I want to calculate some stats like "log-ins in the past hour". The problem is similar to the one described here: http://highscalability.com/blog/2008/4/19/how-to-build-a-real-time-analytics-system.html The simplest approach would be to do a select like this: select count(distinct user_id) from logs where date>='20120601 1200' and date <='20120601 1300' (of course other conditions could apply for the stats, like log-ins per country) Of course this would be really slow, mainly if it has millions (or even thousands) of rows, and I want to query this every time a page is displayed. How would you summarize the data? What should go to the (mem)cache? EDIT: I'm looking for a way to de-normalize the data, or to keep the cache up-to-date. For example I could increment an in-memory variable every time someone logs in, but that would help to know the total amount of logins, not the "logins in the last hour". Hope it's more clear now.

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  • In javascript, how do I find out the name of a function from within that function?

    - by roryhewitt
    The title should make it clear. Is it possible from within a function to determine the name of that function? Basically, I'm adding some debugging code to a number of functions, and I'd like to be able to simply add the following line inside every function: if (global_debugOn) alert("Processing function " + function-name); How can I get 'function-name'? Yes, obviously I could simply type in the function name (after all I'm typing in the whole alert bit), but that's a hassle to do, especially if there is a nice simple way of retrieving it dynamically. Plus, as function names change during development, I'd like to keep it up-to-date... I hoped that maybe the arguments attribute might hold this (e.g. arguments[0], like in C), but I couldn't get it to work. I'm not even sure if arguments works anyway. Thanks! Rory

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  • How to auto-increment reference number persistently when NSManagedObjects created in core-data.

    - by KayKay
    In my application i am using core-data to store information and saving these data to the server using web-connectivity i have to use MySql. Basically what i want to do is to keep track of number of NSManagedObject already created and Whenever i am adding new NSManagedObject, based on that counting it will assign the class a Int_value which will act as primary_key in MySql. For examaple, there are already 10 NSManagedobjects, and when i will add new one it will assign it "11" as primary_key. these value will have to be increasing because there is no deleting of NSManagedObject. From my approach its about static member in applicationDelegate whose initial value can be any integer but should be incremented by one(like auto-increment) everytime new NSManagedObject is created and also it should be persistent. I am not clear how to do this, please give me suggestions. Thanks in advance.

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  • MySql SELECT AS - Append all field names

    - by jeerose
    I'd like to do something like this: SELECT table.id AS prefix_id, table.name AS prefix_name ... and have the prefix added dynamically to all field names rather than selecting them all manually (ie SELECT table.* AS prefix_* or something) Hopefully I've described that accurately. Any thoughts? Edit To be clear, the reason I'm asking is to make sure that my query result contains every column from each table I call even if there are duplicate field names. For example, I might have a table with lots of fields which means I don't want to alias all the fields manually. Further if 3 tables have a field called name my result won't contain three name results; it will have one. I want to avoid ambiguity with my column names.

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  • Simplest solution to replace a tiny file inside an MSI?

    - by sascha
    Many of our customers have access to InstallShield, WISE or AdminStudio. These aren't a problem. I'm hoping there is some way I can provide our smaller customers without access to commercial repackaging tools a freely available set of tools and steps to do the file replacement themselves. Only need to replace a single configuration file inside a compressed MSI, the target user can be assumed to already have Orca installed, know how to use this to customize the Property table (to embed license details for GPO deployment) and have generated an MST file. Disclaimer: this is very similar to another question but both questions and answers in that thread are not clear.

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  • telling java to accept self-signed ssl certificate

    - by Nikita Rybak
    It looks like a standard question, but I couldn't find clear directions anywhere. I have java code trying to connect server with probably self-signed (or expired) certificate. It gives something like this [HttpMethodDirector] I/O exception (javax.net.ssl.SSLHandshakeException) caught when processing request: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target As I understand, I have to play around with keytool and tell java that it's ok to allow this connection. But all comments I've found assume I'm fully proficient with keytool, like "generate private key for server and import it into keystore". And I'm not. Is there anybody who could post detailed instructions? I'm running unix, so bash script would be best. Not sure if it's important, but code executed in jboss. Thanks a lot!

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  • Any difference between lazy loading Javascript files vs. placing just before </body>

    - by mhr
    Looked around, couldn't find this specific question discussed. Pretty sure the difference is negligible, just curious as to your thoughts. Scenario: All Javascript that doesn't need to be loaded before page render has been placed just before the closing </body> tag. Are there any benefits or detriments to lazy loading these instead through some Javascript code in the head that executes when the DOM load/ready event is fired? Let's say that this only concerns downloading one entire .js file full of functions and not lazy loading several individual files as needed upon usage. Hope that's clear, thanks.

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  • How do I replace colours in a movieclip?

    - by Oli
    I am trying to take a movieclip of a character and change the colour of their clothes. The character is comprised of vectors. So far I have semi-sucessfully used this method: stop the movieclip take the bitmap data from the current frame use threshold to replace the colour store the resulting bitmap data in an array add an onenterframe function - clear the current frame and add the bitmap data from the processed data in the array So - this works pretty well. Each frame is only processed once at the beginning and then the write to the movieclip is very quick. However! As the replacement is being performed on a bitmap there is an amount of aliasing that takes place to remove jaggies/pixelation. This produces colours that are not matched using threshold. So the main colour is replaced correctly but it is surrounded by a halo of mixed colours :( I am sure there should be a better way to do this. Any ideas or answers would be greatly apreciated - Thanks.

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  • Email php isn't working, please help?

    - by laurence-benson
    Hey Guys, My email code isn't working, can anyone help? Thanks. <?php if(isset($_POST['send'])){ $to = "[email protected]" ; // change all the following to $_POST $from = $_REQUEST['Email'] ; $name = $_REQUEST['Name'] ; $headers = "From: $from"; $subject = "Web Contact Data"; $fields = array(); $fields{"Name"} = "Name"; $fields{"Email"} = "Email"; $body = "We have received the following information:\n\n"; foreach($fields as $a => $b){ $body .= sprintf("%20s: %s\n",$b,$_REQUEST[$a]); } $subject2 = "Thank you for contacting us."; $autoreply = "<html><body><p>Dear " . $name . ",</p><p>Thank you for registering with ERB Images.</p> <p>To make sure that you continue to receive our email communications, we suggest that you add [email protected] to your address book or Safe Senders list. </p> <p>In Microsoft Outlook, for example, you can add us to your address book by right clicking our address in the 'From' area above and selecting 'Add to Outlook Contacts' in the list that appears.</p> <p>We look forward to you visiting the site, and can assure you that your privacy will continue to be respected at all times.</p><p>Yours sincerely.</p><p>Edward R Benson</p><p>Edward Benson Esq.<br />Founder<br />ERB Images</p><p>www.erbimages.com</p></body></html>"; $headers2 = 'MIME-Version: 1.0' . "\r\n"; $headers2 .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n"; $headers2 .= 'From: [email protected]' . "\r\n"; mail($from, $subject2, $autoreply, $headers2); $send=false; if($name == '') {$error= "You did not enter your name, please try again.";} else { if(!preg_match("/^[[:alnum:]][a-z0-9_.'+-]*@[a-z0-9-]+(\.[a-z0-9-]{2,})+$/",$from)) {$error= "You did not enter a valid email address, please try again.";} else { $send = mail($to, $subject, $body, $headers); $send2 = mail($from, $subject2, $autoreply, $headers2); } if(!isset($error) && !$send) $error= "We have encountered an error sending your mail, please notify [email protected]"; } }// end of if(isset($_POST['send'])) ?> <?php include("http://erbimages.com/php/doctype/index.php"); ?> <?php include("http://erbimages.com/php/head/index.php"); ?> <div class="newsletter"> <ul> <form method="post" action="http://lilyandbenson.com/newletter/index.php"> <li> <input size="20" maxlength="50" name="Name" value="Name" onfocus="if(this.value==this.defaultValue) this.value='';" onblur="if(this.value=='') this.value=this.defaultValue;"> </li> <li> <input size="20" maxlength="50" name="Email" value="Email" onfocus="if(this.value==this.defaultValue) this.value='';" onblur="if(this.value=='') this.value=this.defaultValue;"> </li> <li> <input type="submit" name="send" value="Send" id="register_send"> </li> </form> <?php ?> </ul> <div class="clear"></div> </div> <div class="section_error"> <?php if(isset($error)) echo '<span id="section_error">'.$error.'</span>'; if(isset($send) && $send== true){ echo 'Thank you, your message has been sent.'; } if(!isset($_POST['send']) || isset($error)) ?> <div class="clear"></div> </div> </body> </html>

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  • What to name an array of flags?

    - by Chris
    I have a project where lots of the objects hold state by maintaining simple boolean flags. There are lots of these, so I maintain them within a uint32_t and use bit masking. There are now so many flags to keep track of, I've created an abstraction for them (just a class wrapping the uint32_t) with set(), clear(), etc. My question: What's a nice accurate, concise name for this class? What name could I give this class so that you'd have a reasonable idea what it was [for] knowing the name only? Some ideas I had: FlagBank FlagArray etc Any ideas? Thanks in advance! Cheers, -Chris

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  • Python character count

    - by user74283
    I have been going over python tutorials in this resource. Everything is pretty clear in the below code which counts number of characters. Only section that i dont understand is the section where count assigned to a list and multiplied by 120. Can anyone explain what is the purpose of this in plain english please. def display(i): if i == 10: return 'LF' if i == 13: return 'CR' if i == 32: return 'SPACE' return chr(i) infile = open('alice_in_wonderland.txt', 'r') text = infile.read() infile.close() counts = 128 * [0] for letter in text: counts[ord(letter)] += 1 outfile = open('alice_counts.dat', 'w') outfile.write("%-12s%s\n" % ("Character", "Count")) outfile.write("=================\n") for i in range(len(counts)): if counts[i]: outfile.write("%-12s%d\n" % (display(i), counts[i])) outfile.close()

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  • Unable to commit to Subversion

    - by Ewan Makepeace
    I have a client who had to rebuild his automated build server. He checked out his project folder from my subversion server but is now no longer able to commit - he gets this error: Error: Commit failed (details follow): Error: Cannot write to the prototype revision file of transaction '551-1' because a Error: previous representation is currently being written by another process Finished!: I have searched Google but although this error has been often reported there is no clear explanation - does anyone on StackOverflow have a solution? UPDATE: Nobody else commits to that repository, so it was not a transaction stuck (at least not from another user). In the end we found that permissions were not set correctly. Not that you would know it from this message, but that fixed the problem.

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  • jQuery Rollovers Not Preloading

    - by zuk1
    $('.ro').hover( function(){ t = $(this); t.attr('src',t.attr('src').replace(/([^.]*)\.(.*)/, "$1_o.$2")); }, function(){ t = $(this); t.attr('src',t.attr('src').replace('_o','')); } ); I use this code so that (for examle) test.gif with the class 'ro' would change to test_o.gif on rollover, the problem is when the images aren't in the cache there is lag on rollover and rolloff. Basically if I clear my cache and visit the test page, everytime I rollover and rolloff the image it is loading the file each time, so you could sit there for hours and it would still be loading the rollover images each time. However, when I refresh the page and the images are now in the cache it works instantly, which is what I need to achieve. I've tried using this http://flesler.blogspot.com/2008/01/jquerypreload.html plugin to preload the images with this $.preload('.ro'); code, but it seems to have no effect. Any ideas?

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  • android: having two listviews in two listactivities didn't work

    - by Yang
    I guess my previous question wasn't clear enough (http://stackoverflow.com/questions/2549585/android-failed-to-setcontentview-when-switching-to-listactivity), so I explain as follows. In my app I have two listactivities which uses two different listviews: public class Activity1 extends ListActivity { @Override public void onCreate(Bundle savedInstanceState) { try{ super.onCreate(savedInstanceState); setContentView(R.layout.listview1); } public class Activity2 extends ListActivity { @Override public void onCreate(Bundle savedInstanceState) { try{ super.onCreate(savedInstanceState); setContentView(R.layout.listview2); } } As required by android, listview must have an ID which is exactly "@android:id/list". If I set the listview in both listview1 and listview2 with the same ID, then they will end up using the same format of listview, which is not what I want. But if I set one of the IDs to be sth like "@+id/listview2", android gave me the error: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list' How do I handle this dilema?

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  • perl debugger freezes

    - by vbNewbie
    First time perl user and I am trying to debug some script to follow project logic and of course syntax. Using cygwin after entering $perl -d sample.pl Loading DB routines from perl5db.pl version 1.3 Editor support available. Enter h or h h' for help, orperldoc perldebug' for more help. main::(sample2.pl:7): looper(); DB<1 It hangs at the DB<1 line. I cannot enter anything at the prompt. Is there a reason why this post is inappropriate? or how is this not clear?

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  • Functionality in a Data Access Layer formed by a dbml

    - by Younes
    I got a Data Access Layer that's being formed by one DBML in which i just include all object I need. Is it necessary to write more functionality in this dbml or can I just use the dbml as my DAL? I ask this because I am currently writing functionality to, for example, get all Articles from a Table in the Business Logic Layer. So I'm kind of lost now. What kind of examples can be given so that it's clear to me what to put in the Business Layer.

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  • problem in basic implementation of MVVM pattern - Services

    - by netmajor
    I watch some video and read articles about MVVM pattern and start thinking how should I implement it in my Silverlight app. So at first I create Silverlight application. I think that for clear view I create 3 folders: View - for each user control page in my app, ViewModel - for c# class which will querying date and Model- Entity Data Model of my SQL Server or Oracle Database. And now I am confused, cause I want to implement *WCF/RIA Services/Web services* in my project. In which folder should I put in class of services? I see in examples that Services take date and filtering it and then output data was binding in View - so It looks as ViewModel. But I was sure that someone use Services in Model and that I want to do. But how? Can someone explain me implementing Services as Model? Is my point of view at MVVM is correctly?

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  • Trying to run psexec to remote to server and recycle app pool

    - by James
    If I run this from my command prompt it works fine. psexec \ServerName cscript.exe iisapp.vbs /a AppName /r I'm trying to do the same thing with C# console app. I'm using the below code but most of the time the application hangs and doesn't complete, and the few times it does it throws an error code. Am I doing this wrong? Anyone know where I can look up the error or error code? static void RecycleAppPool(string sServer) { Console.Clear(); ProcessStartInfo p = new ProcessStartInfo("psexec.exe", "\\\\" + sServer + " cscript.exe iisapp.vbs /a <AppName> /r"); p.RedirectStandardInput = true; p.UseShellExecute = false; Process.Start(p); } When it completes with error, looks like this "cscript.exe exited with error code -2147024664"

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  • Reused UIWebView showing previous loaded content for a brief second on iPhone

    - by Roi
    In one of my apps I reuse a webview. Each time the user enters a certain view on reload cached data to the webview using the method - (void)loadData:(NSData *)data MIMEType:(NSString *)MIMEType textEncodingName:(NSString *)encodingName baseURL:(NSURL *)baseURL and I wait for the callback call - (void) webViewDidFinishLoad:(UIWebView *)webView. In the mean time I hide the webview and show a 'loading' label. Only when I receive webViewDidFinishLoad do I show the webview. Many times what happens is I see the previous data that was loaded to the webview for a brief second before the new data I loaded kicks in. I already added a delay of 0.2 seconds before showing the webview but it didn't help. Instead of solving this by adding more time to the delay does anyone know how to solve this issue or maybe clear old data from a webview without release and allocating it every time?

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  • Mathematica Plot3D does not produce a plot when graphing a user-defined function?

    - by pythonscript
    I'm writing a simple Mathematica implementation of the black-scholes model and using Plot3D to plot the pricing surface. However, when I run this code, no plot is produced. My call and put functions to produce correct values when run separately, but no plot is produced. Code: Clear[d1, d2, call, put, stockPrice, strikePrice, riskFreeRate, timeToExp, volatility] d1[stockPrice_, strikePrice_, riskFreeRate_, timeToExp_, volatility_] := (Log[stockPrice / strikePrice] + (riskFreeRate + 0.5*volatility^2)*timeToExp) / (volatility * Sqrt[timeToExp]) d2[stockPrice_, strikePrice_, riskFreeRate_, timeToExp_, volatility_] := d1[stockPrice, strikePrice, riskFreeRate, timeToExp, volatility] - volatility*Sqrt[timeToExp] call[stockPrice_, strikePrice_, riskFreeRate_, timeToExp_, volatility_] := stockPrice * CDF[NormalDistribution[0, 1], d1[stockPrice, strikePrice, riskFreeRate, timeToExp, volatility]] - strikePrice * Exp[-riskFreeRate*timeToExp] *CDF[NormalDistribution[0, 1], d2[stockPrice, strikePrice, riskFreeRate, timeToExp, volatility]] Plot3D[call[stockPrice, 500, 0.0030, timeToExp, 0.39], {stockPrice, 10, 1000}, {timetoExp, 0.0833333, 5}] Other plots, like this sample from the reference, do work. Plot3D[{x^2 + y^2, -x^2 - y^2}, {x, -2, 2}, {y, -2, 2}, RegionFunction -> Function[{x, y, z}, x^2 + y^2 <= 4], BoxRatios -> Automatic]

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  • LRU caches in C

    - by lazyconfabulator
    I need to cache a large (but variable) number of smallish (1 kilobyte to 10 megabytes) files in memory, for a C application (in a *nix environment). Since I don't want to eat all my memory, I'd like to set hard memory limit (say, 64 megabytes) and push files into a hash table with the file name as the key and dispose of the entries with the least use. What I believe I need is an LRU cache. Really, I'd rather not roll my own so if someone knows where I can find a workable library, please point the way? Failing that, can someone provide a simple example of an LRU cache in C? Related posts indicated that a hash table with a doubly-linked list, but I'm not even clear on how a doubly-linked list keeps LRU. Side note: I realize this is almost exactly the function of memcache, but it's not an option for me. I also took a look at the source hoping to enlighten myself on LRU caching, with no success.

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