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  • Hashing a python function to regenerate output when the function is modified

    - by Seth Johnson
    I have a python function that has a deterministic result. It takes a long time to run and generates a large output: def time_consuming_function(): # lots_of_computing_time to come up with the_result return the_result I modify time_consuming_function from time to time, but I would like to avoid having it run again while it's unchanged. [time_consuming_function only depends on functions that are immutable for the purposes considered here; i.e. it might have functions from Python libraries but not from other pieces of my code that I'd change.] The solution that suggests itself to me is to cache the output and also cache some "hash" of the function. If the hash changes, the function will have been modified, and we have to re-generate the output. Is this possible or ridiculous? Updated: based on the answers, it looks like what I want to do is to "memoize" time_consuming_function, except instead of (or in addition to) arguments passed into an invariant function, I want to account for a function that itself will change.

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  • How to buld selective Projects within a Solution in TS 2008 in Team Build?

    - by Steve Johnson
    Hi all. I have a solution the source Control (TFS 2008) with multiple projects. Some of the projects are independent of each other. I dont want to build the complete solution instead sometimes we need to build some of the projects. I am a total newbie in Team Build. Please help how i can use the <SolutionToBuild Include="$(BuildProjectFolderPath)/../../Development/Main/Build-Development.sln"> <Targets></Targets> <Properties></Properties> </SolutionToBuild> to select only some of the projects from the solution. Kindly give a detailed answer for me as i am absolutely clueless about it. Thanks

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  • Did "general education" classes make you a better programmer?

    - by Big Johnson
    I'm surprised by the number of general education classes computer science students must complete to get their bachelors. For example, I must take: three English classes two history classes public speaking economics biology I hardly think these general education requirements are unique to the university I attend. My question is (for those of you who have degrees), in what ways have these general education requirements improved your career as a programmer?

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  • How do I add a function to an element via jQuery?

    - by Chad Johnson
    I want to do something like this: $('.dynamicHtmlForm').validate = function() { return true; } $('.dynamicHtmlForm .saveButton').click(function() { if (!$(this).closest('.dynamicHtmlForm').validate()) { return false; } return true; }); And then when I have a form of class dynamicHtmlForm, I want to be able to provide a custom validate() function: $('#myDynamicHtmlForm').validate = function() { // do some validation if (there are errors) { return false; } return true; } But I get this when I do this: $(this).closest(".dynamicHtmlForm").validate is not a function Is what I've described even possible? If so, what am I doing wrong?

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  • What is the standard or best way to deal with database branching with Mercurial or Git branches?

    - by Chad Johnson
    This has been a big question mark on my mind. I'm moving to Mercurial or Git very soon for my web software, and sometimes my branches require significant database changes which other branches should not see. This, I can't always share the same database for my branches. Is there some standard way of dealing with database changes for branching and cloning? What do you all do? I'm using MySQL.

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  • How do I add a function to a specific element type in jQuery?

    - by Chad Johnson
    I can do this jQuery.fn.validate = function(options) { var defaults = { validateOPtions1 : '', validateOPtions2 : '' }; var settings = $.extend({}, defaults, options); return this.each(function() { // you validation code goes here }); }; but that will make validate() available for every element. I could do this to any element: $('some selector').validate(). Is there a way I can make this only available to, say, form elements? eg. $('.mySpecialFormClass').validate()?

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  • Cache an FTP connection for use via AJAX?

    - by Chad Johnson
    I'm working on a Ruby web Application that uses the Net::FTP library. One part of it allows users to interact with an FTP site via AJAX. When the user does something, and AJAX call is made, and then Ruby reconnects to the FTP server, performs an action, and outputs information. Every time the AJAX call is made, Ruby has to reconnect to the FTP server, and that's slow. Is there a way I could cache this FTP connection? I've tried caching in the session hash, but "We're sorry, but something went wrong" is displayed, and a TCP dump is outputted in my logs whenever I attempt to store it in the session hash. I haven't tried memcache yet. Any suggestions?

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  • Rails-like console for PHP?

    - by Chad Johnson
    Every so often, things work in my local PHP development environment, while in my test environment on my server, things do not. It's a nightmare to debug this. If I had a console like Rails provides, debugging would be much much simpler. Is there anything like the Rails console but for PHP? I should mention that I am using a home-brewn PHP application.

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  • Not Equal two Generic Lists

    - by David Johnson
    I have two generic lists, both containing different data, except 4 fields, which I want to compare to another list and find items that do not match in either list. I need to basically replace where it says equals below, with not equals! var unMatchedData = from liveLines in liveList join oldList in comapreSnapshotList on new {liveLines.ClientNo, liveLines.SequenceNo, liveLines.LineNo, liveLines.Text} equals new {oldList.ClientNo, oldList.SequenceNo, oldList.LineNo, oldList.Text} select new KNOWTXTS { ClientNo = liveLines.ClientNo, SequenceNo = liveLines.SequenceNo, LineNo = liveLines.LineNo, Text = liveLines.Text };

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  • Why must I use local path rather than 'svn://' with SVN bindings?

    - by Chad Johnson
    I'm using the Ruby SVN bindings built with SWIG. Here's a little tutorial. When I do this @repository = Svn::Repos.open('/path/to/repository') I can access the repository fine. But when I do this @repository = Svn::Repos.open('svn://localhost/some/path') It fails with /SourceCache/subversion/subversion-35/subversion/subversion/libsvn_subr/io.c:2710: 2: Can't open file 'svn://localhost/format': No such file or directory When I do this from the command line, I do get output svn ls svn://localhost/some/path Any ideas why I can't use the svn:// protocol?

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  • Way to check for foreign key references before deleting in MySQL?

    - by Chad Johnson
    I'm working with a content management system, and users are prompted with a confirmation screen before deleting records. Some records are foreign key referenced in other tables, and therefore they cannot be deleted. I would like to display a message beside a given record if it has foreign key references. To know whether I should display the message for a record, I could just query the referencing table and see if there are references. But the problem is, there are about a dozen tables with records potentially referencing this record, and a lookup could take a "long" time. Is there an easy way to tell whether the record is delete-ready (ie. has no foreign key references)?

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  • Bad idea to force creation of Mercurial remote heads (ie. branches)?

    - by Chad Johnson
    I am developing a centralized web application, and I have a centralized Mercurial repository. Locally I created a branch in my repository hg branch my_branch I then made some changes and committed. Then when I try to push, I get abort: push creates new remote branch 'my_branch'! (did you forget to merge? use push -f to force) I've just been using push -f. Is this bad? I WANT multiple branches in my central, remote repository, as I want to 1) back up my work and 2) allow other developers to develop with me on that branch. Is it bad or something to have branches in my remote repository or something? Should I not be doing push -f (and if not, what should I do?)? Why does Joel say this in his tutorial: Occasionally I've made a change in a branch, pushed, switched to another branch, and changes I had made in that branch I switch to were mysteriously reverted to a previous version from several commits ago. Maybe this is a symptom of forcing a push?

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  • Duplicate array but maintain pointer links

    - by St. John Johnson
    Suppose I have an array of nodes (objects). I need to create a duplicate of this array that I can modify without affecting the source array. But changing the nodes will affect the source nodes. Basically maintaining pointers to the objects instead of duplicating their values. // node(x, y) $array[0] = new node(15, 10); $array[1] = new node(30, -10); $array[2] = new node(-2, 49); // Some sort of copy system $array2 = $array; // Just to show modification to the array doesn't affect the source array array_pop($array2); if (count($array) == count($array2)) echo "Fail"; // Changing the node value should affect the source array $array2[0]->x = 30; if ($array2[0]->x == $array[0]->x) echo "Goal"; What would be the best way to do this?

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  • IndexedDB and Relationships

    - by Josh Johnson
    Can I create relationships between my object stores in IndexedDB? For example, I have two object stores: artist and album. An artist has a one-to-many relationship with an album. album.artistId relates the album to artist.id. I'm thinking along the lines of Hibernate here. I would like to do a query for artists and have the albums belonging to that artist returned as an array called artists on the album object. artist.albums = [];

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  • Count of Sums possibly using group_by

    - by Daniel Johnson
    Say you have a user table and an order table which references user (user has_many orders) and contains an item count field. How could you efficiently ask "how many uses ordered how many items?" That is, to generate something along the lines of: Number of users | sum of items ------------------------------- 5 users | 1 item 4 users | 5 items 1 user | 7 items Thanks in advance.

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  • January Winnipeg .NET User Group Event

    - by D'Arcy Lussier
    We’ve had some problems with the Winnipeg .NET UG website, but things are getting sorted out and the site should be back up very shortly. In the meantime, here’s info on our January event and how to register. This is also a Microsoft sponsored event, so we’ll have some great swag to give away. As always, pizza will be provided! When: Wednesday, January 26th Where: 17th Floor Conference Room, Richardson Building Session: Taking your Windows Phone Apps to the Next Level with Tombstoning Speaker: Tyler Doerksen, Imaginet Unlike previous versions of Windows Mobile, Windows Phone 7 does not allow 3rd party applications to run in the background. Because of this your application needs to react to various life cycle events to provide the user with a seamless experience. Luckily Silverlight isolated storage has your back. In this session learn about the app life cycle and what storage patterns you can use to keep your users happy. To register for this event, please visit our registration page here.

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  • See how one goal leads to another (i.e., how often downloading the demo leads to purchasing)

    - by s3cur3
    I have two goals set up for my site in Google Analytics: one to download the demo of my software, and the other to buy the full version. I'm having trouble getting statistics on how often the download leads to a purchase. This seems like something the multi-channel funnel is perfect for (as in this question)---I expect that it takes multiple visits for the demo download to convert into an order. However, I can't seem to narrow down the multi-channel funnel data into only those that have one goal followed by another. If it matters, I'm tracking the ordering action as a page view (i.e., someone views the "Thanks for ordering" page) and the demo download as an action (which fires when someone clicks the "download" button). Thanks! - Tyler

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  • Silverlight Cream for May 11, 2010 -- #859

    - by Dave Campbell
    In this All Submittal Issue: Colin Eberhardt, Ken Johnson, Alan Beasley, Pencho Popadiyn, Phil Middlemiss, Khawar(-2-), Levente Mihály, Alex van Beek, Bart Czernicki, Michael Washington, and Mark Monster. Shoutout: Not Silverlight necessarily, but definitely VS2010, read what Brett Balmer has to say In Defense of Portrait Mode From SilverlightCream.com: Silverlight MultiBinding solution for Silverlight 4 Colin Eberhardt updated his Silverlight Multibinding solution to Silverlight 4. Great article with explanatory graphics, and links to the code... congrats on the use in the FaceBook Client too! Spirograph Shapes: WPF Bezier shapes from math formulae Wow... I haven't seen this much math since my Master's Thesis! ... Check out all the shapes Ken Johnson has built... don't let the math scare you... just use it :) Busy Dizzy Bee-sley Spirographic Animation in Expression Blend and Silverlight This is just fun... I saw Michael Washington playing with this yesterday at the Arizona Day of .NET but didn't have a chance to ask what it was.. Alan Beasley had a good time building this, and is sharing a very detailed tutorial with us. ModalDialogs, IEditableObject and MVVM in Silverlight 4 Pencho Popadiyn said the 'M' word over at SilverlightShow... actually the 'MVVM' word :) ... he's discussing Modal dialogs with no code in the View ... check out how he did it. A Chrome and Glass Theme - Part 6 Phil Middlemiss is up to episode 6 in his Theme-building tutorial... this time out, he's giving the TabControl and TabItem new clothes ... specifically discussing what to change and what to allow to inherit ... good stuff! Silverlight 4 Fonts gotcha Check out Khawar's ATM Machine demo -- there's a link on the page for this post... he had an issue with fonts, ratted it out, and explains it for all of us... thanks Khawar Demystifying Silverlight Obfuscation Khawar also has a good post up on Obfuscating your Silverlight... definitely showing that it's not all that difficult to do. geoGallery, a WinPhone7 sample OK this is interesting... using the geoLocation feature of WP7, Levente Mihály hits Google Picasa to find pictures... good write-up and all the code. Silverlight 4: Digitally signing a XAP with Visual Studio 2010 Alex van Beek has a nice tutorial on Signing your XAP file using Visual Studio 2010... of course you may want to visit Tim Heuer's blog (search at SC) to find the two good deals on certificates that are still in play. Creating Key Performance Indicators (KPIs) in Expression Blend 4 for Business Intelligence applications In an interesting post, Bart Czernicki describes using the shape assets in Blend 4 to produce a KPI display in Silverlight or WPF. A discussion of the shape's evolution for KPI is included as well as some alternate shape uses. A DotNetNuke Silverlight 4 Drag and Drop File Manager Michael Washington has blogged about his Drag and Drop File Manager using the View Model Style pattern. This is covered in two CodeProject articles listed in the post. The design work was done by Alan Beasely and links to his work is there as well as covered in other SC posts. How to select a ListItem on Hover Mark Monster had a Use Case for Selecting a ListBox entry by hovering ... but he did it with a Behavior and for a ListBox and PathListBox and it works with DataBinding... Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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  • SQL Server, how to join a table in a "rotated" format (returning columns instead of rows)?

    - by Joshua Carmody
    Sorry for the lame title, my descriptive skills are poor today. In a nutshell, I have a query similar to the following: SELECT P.LAST_NAME, P.FIRST_NAME, D.DEMO_GROUP FROM PERSON P JOIN PERSON_DEMOGRAPHIC PD ON PD.PERSON_ID = P.PERSON_ID JOIN DEMOGRAPHIC D ON D.DEMOGRAPHIC_ID = PD.DEMOGRAPHIC_ID This returns output like this: LAST_NAME FIRST_NAME DEMO_GROUP --------------------------------------------- Johnson Bob Male Smith Jane Female Smith Jane Teacher Beeblebrox Zaphod Male Beeblebrox Zaphod Alien Beeblebrox Zaphid Politician I would prefer the output be similar to the following: LAST_NAME FIRST_NAME Male Female Teacher Alien Politician --------------------------------------------------------------------------------------------------------- Johnson Bob 1 0 0 0 0 Smith Jane 0 1 1 0 0 Beeblebrox Zaphod 1 0 0 1 1 The number of rows in the DEMOGRAPHIC table varies, so I can't say with certainty how many columns I need. The query needs to be flexible. Yes, it would be trivial to do this in code. But this query is one piece of a complicated set of stored procedures, views, and reporting services, many of which are outside my sphere of influence. I need to produce this output inside the database to avoid breaking the system. Any ideas? This is MS SQL Server 2005, by the way. Thanks.

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  • finding ALL cycles in a huge sparse matrix

    - by Andy
    Hi there, First of all I'm quite a Java beginner, so I'm not sure if this is even possible! Basically I have a huge (3+million) data source of relational data (i.e. A is friends with B+C+D, B is friends with D+G+Z (but not A - i.e. unmutual) etc.) and I want to find every cycle within this (not necessarily connected) directed graph. I've found this thread (http://stackoverflow.com/questions/546655/finding-all-cycles-in-graph/549402#549402) which has pointed me to Donald Johnson's (elementary) cycle-finding algorithm which, superficially at least, looks like it'll do what I'm after (I'm going to try when I'm back at work on Tuesday - thought it wouldn't hurt to ask in the meanwhile!). I had a quick scan through the code of the Java implementation of Johnson's algorithm (in that thread) and it looks like a matrix of relations is the first step, so I guess my questions are: a) Is Java capable of handling a 3+million*3+million matrix? (was planning on representing A-friends-with-B by a binary sparse matrix) b) Do I need to find every connected subgraph as my first problem, or will cycle-finding algorithms handle disjoint data? c) Is this actually an appropriate solution for the problem? My understanding of "elementary" cycles is that in the graph below, rather than picking out A-B-C-D-E-F it'll pick out A-B-F, B-C-D etc. but that's not the end of the world given the task. E / \ D---F / \ / \ C---B---A d) If necessary, I can simplify the problem by enforcing mutuality in relations - i.e. A-friends-with-B <== B-friends-with-A, and if really necessary I can maybe cut down the data size, but realistically it is always going to be around the 1mil mark. z) Is this a P or NP task?! Am I biting off more than I can chew? Thanks all, any help appreciated! Andy

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  • Website Vulnerabilities

    - by Ben Griswold
    The folks at the Open Web Application Security Project publish a list of the top 10 vulnerabilities. In a recent CodeBrew I provided a quick overview of them all and spent a good amount of time focusing on the most prevalent vulnerability, Cross Site Scripting (XSS).  I gave an overview of XSS, stepped through a quick demo (sorry vulnerable site), reviewed the three XSS variations and talked a bit about how to protect one’s site.  References and reading materials were also included in the presentation and, look at that, they are provided here too. Open Web Application Security Project The OWASP Top Ten Vulnerabilities (pdf) OWASP List of Vulnerabilities The 56 Geeks Project by Scott Johnson ha.ckers.org OWASP XSS Prevention Cheat Sheet Wikipedia Is XSS Solvable?, Don Ankney The Anatomy of Cross Site Scripting, Gavin Zuchlinski

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  • Google I/O 2010 - Ignite Google I/O

    Google I/O 2010 - Ignite Google I/O Google I/O 2010 - Ignite Google I/O Tech Talks Brady Forrest, Krissy Clark, Ben Huh, Matt Harding, Clay Johnson, Bradley Vickers, Aaron Koblin, Michael Van Riper, Anne Veling, James Young Ignite captures the best of geek culture in a series of five-minute speed presentations. Each speaker gets 20 slides that auto-advance after 15 seconds. Check out last year's Ignite Google I/O. For all I/O 2010 sessions, please go to code.google.com/events/io/2010/sessions.html From: GoogleDevelopers Views: 206 3 ratings Time: 58:30 More in Science & Technology

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  • Google I/O 2010 - Fireside chat with the GWT team

    Google I/O 2010 - Fireside chat with the GWT team Google I/O 2010 - Fireside chat with the GWT team Fireside Chats, GWT Bruce Johnson, Joel Webber, Ray Ryan, Amit Manjhi, Jaime Yap, Kathrin Probst, Eric Ayers, lan Stewart, Christian Dupuis, Chris Ramsdale (moderator) If you're interested in what the GWT team has been up to since 2.0, here's your chance. We'll have several of the core engineers available to discuss the new features and frameworks in GWT, as well as to answer any questions that you might have. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 140 0 ratings Time: 58:32 More in Science & Technology

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