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  • Pandas Dataframe to JSON File with Separate Records

    - by Chris
    I'm attempting to dump data from a Pandas Dataframe into a JSON file to import into MongoDB. The format I require in a file has JSON records on each line of the form: {<column 1>:<value>,<column 2>:<value>,...,<column N>:<value>} df.to_json(,orient='records') gets close to the result but all the records are dumped within a single JSON array. Any thoughts on an efficient way to get this result from a dataframe? UPDATE: The best solution I've come up with is the following: dlist = df.to_dict('records') dlist = [json.dumps(record)+"\n" for record in dlist] open('data.json','w').writelines(dlist)

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  • asp.net mvc, IIS 6 vs IIS7.5, and integrated windows authentication causing javascript errors?

    - by chris
    This is a very strange one. I have an asp.net MVC 1 app. Under IIS6, with no anon access - only integrated windows auth - every thing works fine. I have the following on most of my Foo pages: <% using (Html.BeginForm()) { %> Show All: <%= Html.CheckBox("showAll", new { onClick = "$(this).parent('form:first').submit();" })%> <% } %> Clicking on the checkbox causes a post, the page is reloaded, everything is good. When I look at the access logs, that's what I see, with one oddity - the js library is requested during the page first request, but not for any subsequent page requests. Log looks like: GET / 401 GET / 200 GET /Content/Site.css 304 GET /Scripts/jquery-1.3.2.min.js 401 GET /Scripts/jquery-ui-1.7.2.custom.min.js 401 GET /Scripts/jquery.tablesorter.min.js 401 GET /Scripts/jquery-1.3.2.min.js 304 GET /Scripts/jquery-ui-1.7.2.custom.min.js 304 GET /Scripts/jquery.tablesorter.min.js 304 GET /Content/Images/logo.jpg 401 GET /Content/Images/logo.jpg 304 GET /Foo 401 GET /Foo 200 POST /Foo/Delete 302 GET /Foo/List 200 POST /Foo/List 200 This corresponds to home page, click on "Foo", delete a record, click a checkbox (which causes the 2nd POST). Under IIS7.5, it sometimes fails - the click on the check box doesn't cause a postback, but there are no obvious reasons why. I've noticed under IIS7.5 that every single page request re-issues the requests for the js libraries - the first one a 401, followed by either a 200 (OK) or 304 (not modified), as opposed to the above log extract where that only happened during the 1st request. Is there any way to eliminate the 401 requests? Could a timing issue have something to do with the click being ignored? Would increasing the number of concurrent connections help? Any other ideas? I'm at a bit of a loss to explain this.

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  • SHA512 vs. Blowfish and Bcrypt

    - by Chris
    I'm looking at hashing algorithms, but couldn't find an answer. Bcrypt uses Blowfish Blowfish is better than MD5 Q: but is Blowfish better than SHA512? Thanks.. Update: I want to clarify that I understand the difference between hashing and encryption. What prompted me to ask the question this way is this article, where the author refers to bcrypt as "adaptive hashing" http://chargen.matasano.com/chargen/2007/9/7/enough-with-the-rainbow-tables-what-you-need-to-know-about-s.html Since bcrypt is based on Blowfish, I was led to think that Blowfish is a hashing algorithm. If it's encryption as answers have pointed out, then seems to me like it shouldn't have a place in this article. What's worse is that he's concluding that bcrypt is the best. What's also confusing me now is that the phpass class (used for password hashing I believe) uses bcrypt (i.e. blowfish, i.e. encryption). Based on this new info you guys are telling me (blowfish is encryption), this class sounds wrong. Am I missing something?

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  • "Executing SQL directly; no cursor" error when using SCOPE_IDENTITY/IDENT_CURRENT

    - by Chris
    There wasn't much on google about this error, so I'm askin here. I'm switching a PHP web application from using MySQL to SQL Server 2008 (using ODBC, not php_mssql). Running queries or anything else isn't a problem, but when I try to do scope_identity (or any similar functions), I get the error "Executing SQL directly; no cursor". I'm doing this immediately after an insert, so it should still be in scope. Running the same insert statement then query for the insert ID works fine in SQL Server Management Studio. Here's my code right now (everything else in the database wrapper class works fine for other queries, so I'll assume it isn't relevant right now): function insert_id(){ return $this->query_first("SELECT SCOPE_IDENTITY() as insert_id"); } query_first being a function that returns the first result from the first field of a query (basically the equivalent of execute_scalar() on .net). The full error message: Warning: odbc_exec() [function.odbc-exec]: SQL error: [Microsoft][SQL Server Native Client 10.0][SQL Server]Executing SQL directly; no cursor., SQL state 01000 in SQLExecDirect in C:[...]\Database_MSSQL.php on line 110

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  • Pixel Shader Effect Examples

    - by Chris Nicol
    I've seen a number of pixel-shader effect examples, stuff like swirl on an image. But I'm wondering if anyone knows of any examples or tutorials for more practical uses of shader effects? I'm not saying that a swirl effect doesn't have it's uses, it's just that many of the examples I've found have the basic effect explained and don't go into how it might be used subtly with another effect or transition to produce a wonderful effect. There's a video here, that outlines all the WPF Effects Library, but I'm not sure how I would use some of them in a practical context. For example, when Flash 8 came out with effects like blur, I found a wonderful video that showed how to use the blur effect to create a cool effect with speeding text, that video inspired many ideas of what I could do with the effects in Flash 8. I'm looking for something similar with Pixel Shader Effects.

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  • Wordpress, WP_Query with custom taxonomy and custom post type

    - by Chris
    This code gets 10 posts of all types that are linked to the term_name; global $wp_query; query_posts( array( "taxonomy_name" => "term_name", 'showposts' => 10 ) ); This code gets 10 posts of custom post type "message"; global $wp_query; query_posts( array( 'post_type' => 'message' 'showposts' => 10 ) ); This code however always ignores the post_type requirement but still selects all post types linked to the term_name; global $wp_query; query_posts( array( 'post_type' => 'message' , "taxonomy_name" => "term_name", 'showposts' => 10 ) ); I can't see how both can work individually but together they don't unless it might be a bug - any thoughts?

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  • Best way to detect integer overflow in C/C++

    - by Chris Johnson
    I was writing a program in C++ to find all solutions of a^b = c (a to the power of b), where a, b and c together use all the digits 0-9 exactly once. The program looped over values of a and b, and ran a digit-counting routine each time on a, b and a^b to check if the digits condition was satisfied. However, spurious solutions can be generated when a^b overflows the integer limit. I ended up checking for this using code like: unsigned long b, c, c_test; ... c_test=c*b; // Possible overflow if (c_test/b != c) {/* There has been an overflow*/} else c=c_test; // No overflow Is there a better way of testing for overflow? I know that some chips have an internal flag that is set when overflow occurs, but I've never seen it accessed through C or C++.

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  • Correct way to import Blueprint's ie.css via DotLess in a Spark view

    - by Chris F
    I am using the Spark View Engine for ASP.NET MVC2 and trying to use Blueprint CSS. The quick guide to Blueprint says to add links to the css files like so: <link rel="stylesheet" href="blueprint/screen.css" type="text/css" media="screen, projection"> <link rel="stylesheet" href="blueprint/print.css" type="text/css" media="print"> <!--[if lt IE 8]><link rel="stylesheet" href="blueprint/ie.css" type="text/css" media="screen, projection"><![endif]--> But I'm using DotLess and wish to simplify Blueprint as suggested here. So I'm doing this in my site.less (which gets compiled to site.min.css by Chirpy): @import "screen.css"; #header { #title { .span-10; .column; } } ... Now my site can just reference site.min.css and it includes blueprint's screen.css, which includes my reset. I can also tack on an @import "print.css" after my @import "screen.css" if desired. But now, I'm trying to figure out the best way to bring in the ie.css file to have Blueprint render correctly in IE6 & IE7. In my Spark setup, I have a partial called _Styles.spark that is brought into the Application.spark and is passed a view model that includes the filenames for all stylesheets to include (and an HtmlExtension to get the full path) and they're added using an "each" iterator. <link each="var styleSheet in Model.Styles" href="${Html.Stylesheet(styleSheet)}" rel="stylesheet" type="text/css" media="all"/> Should I simply put this below the above line in my _Styles.spark file? <!--[if lt IE 8]><link rel="stylesheet" href="${Html.Stylesheet("ie.css")}" type="text/css" media="screen, projection"><![endif]--> Will Spark even process it because it's surrounded by a comment?

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  • Why aren't we programming on the GPU???

    - by Chris
    So I finally took the time to learn CUDA and get it installed and configured on my computer and I have to say, I'm quite impressed! Here's how it does rendering the Mandelbrot set at 1280 x 678 pixels on my home PC with a Q6600 and a GeForce 8800GTS (max of 1000 iterations): Maxing out all 4 CPU cores with OpenMP: 2.23 fps Running the same algorithm on my GPU: 104.7 fps And here's how fast I got it to render the whole set at 8192 x 8192 with a max of 1000 iterations: Serial implemetation on my home PC: 81.2 seconds All 4 CPU cores on my home PC (OpenMP): 24.5 seconds 32 processors on my school's super computer (MPI with master-worker): 1.92 seconds My home GPU (CUDA): 0.310 seconds 4 GPUs on my school's super computer (CUDA with static domain decomposition): 0.0547 seconds So here's my question - if we can get such huge speedups by programming the GPU instead of the CPU, why is nobody doing it??? I can think of so many things we could speed up like this, and yet I don't know of many commercial apps that are actually doing it. Also, what kinds of other speedups have you seen by offloading your computations to the GPU?

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  • ASP.Net Entity Framework, objectcontext error

    - by Chris Klepeis
    I'm building a 4 layered ASP.Net web application. The layers are: Data Layer Entity Layer Business Layer UI Layer The entity layer has my data model classes and is built from my entity data model (edmx file) in the datalayer using T4 templates (POCO). The entity layer is referenced in all other layers. My data layer has a class called SourceKeyRepository which has a function like so: public IEnumerable<SourceKey> Get(SourceKey sk) { using (dmc = new DataModelContainer()) { var query = from SourceKey in dmc.SourceKeys select SourceKey; if (sk.sourceKey1 != null) { query = from SourceKey in query where SourceKey.sourceKey1 == sk.sourceKey1 select SourceKey; } return query; } } Lazy loading is disabled since I do not want my queries to run in other layers of this application. I'm receiving the following error when attempting to access the information in the UI layer: The ObjectContext instance has been disposed and can no longer be used for operations that require a connection. I'm sure this is because my DataModelContainer "dmc" was disposed. How can I return this IEnumerable object from my data layer so that it does not rely on the ObjectContext, but solely on the DataModel? Is there a way to limit lazy loading to only occur in the data layer?

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  • Android TitleBar / NavBar ?

    - by Chris
    I am not sure what the proper term is, but I am trying to add a "TitleBar" to the top of one of the windows in my App. Much like the Contacts App, I have several Tabs along the top of the screen. When you select an item from the list, it loads the next Activity, but that Activity no longer has the Tabs at the top of the screen. I don't know if it is called a TitleBar or what. The Contacts App has this TitleBar along the top of the screen when you select a person from the list of Contacts. I am trying to mimick the Grey Bar that says "George Washington"

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  • How do you keep all your languages straight?

    - by Chris Blackwell
    I think I'm going a little crazy. Right now, I'm working with the following languages (I was just doing a mental inventory): C++ - our game engine Assembler - low level debugging and a few co-processor specific routines Lua - our game engine scripting language HLSL - for shaders Python - our build system and utility tools Objective C/C++ - game engine platform code for Mac and iPhone C# - A few tools developed in our overseas office ExtendScript - Photoshop exporting tools ActionScript - UI scripting VBScript - some spreadsheet related stuff PHP - some web related stuff SQL - some web and tool related stuff On top of this are the plethora of API's that often have many different ways of doing the same thing: std library, boost, .NET, wxWidgets, Cocoa, Carbon, native script libraries for Python, Lua, etc, OpenGL, Direct3d, GDI, Aqua, augh! I find myself inadvertently conflating languages and api's, not realizing what I'm doing until I get syntax errors. I feel like I can't possibly keep up with it, and I can't possibly be proficient in all of these areas. Especially outside the realm of C++ and Python, I find myself programming more by looking at manuals that from memory. Do you have a similar problem? Ideas for compartmentalizing so you're more efficient? Deciding where you want to stay proficient? Organizational tips? Good ways to remember when you switch from Lua to C++ you need to start using semi-colons again? Rants on how complicated we programmers have made things for ourselves? Any ideas welcome!

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  • Rails: Single Table Inheritance and models subdirectories

    - by Chris
    I have a card-game application which makes use of Single Table Inheritance. I have a class Card, and a database table cards with column type, and a number of subclasses of Card (including class Foo < Card and class Bar < Card, for the sake of argument). As it happens, Foo is a card from the original printing of the game, which Bar is a card from an expansion. In an attempt to rationalise my models, I have created a directory structure like so: app/ + models/ + card.rb + base_game/ + foo.rb + expansion/ + bar.rb And modified environment.rb to contain: Rails::Initializer.run do |config| config.load_paths += Dir["#{RAILS_ROOT}/app/models/**"] end However, when my reads a card from the database, Rails throws the following exception: ActiveRecord::SubclassNotFound (The single-table inheritance mechanism failed to locate the subclass: 'Foo'. This error is raised because the column 'type' is reserved for storing the class in case of inheritance. Please rename this column if you didn't intend it to be used for storing the inheritance class or overwrite Card.inheritance_column to use another column for that information.) Is it possible to make this work, or am I doomed to a flat directory structure?

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  • Google Maps API v3: Can I setZoom after fitBounds?

    - by chris
    I have a set of points I want to plot on an embedded Google Map (API v3). I'd like the bounds to accommodate all points unless the zoom level is too low (i.e., zoomed out too much). My approach has been like this: var bounds = new google.maps.LatLngBounds(); // extend bounds with each point gmap.fitBounds(bounds); gmap.setZoom( Math.max(6, gmap.getZoom()) ); This doesn't work. The last line "gmap.setZoom()" doesn't change the zoom level of the map if called directly after fitBounds. Is there a way to get the zoom level of a bounds without applying it to the map? Other ideas to solve this?

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  • Hide cursor in Chrome (and IE)

    - by Chris
    I have the following CSS that hides the mouse cursor for anything on the web page. It works perfectly in FireFox but in IE and and Chrome it doesn't work. html { cursor: none; } In Chrome I always see the mouse pointer. In IE however I see whatever cursor was last 'active' when it entered the screen. Presumably it's keeping the last selection instead of removing it.

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  • IE 11 not listening to MSFullscreenChange

    - by Chris
    IE 11 does not seem to be recognizing MSFullscreenChange. I have this code in the script: document.addEventListener("MSFullscreenChange", function () { if (document.msFullscreenElement != null) { console.info("Went full screen"); } else { console.info("Exited full screen"); } }); In other words, I'm using the exact code shown here on Microsoft's own site, but nothing's being printed out in the console, and I know fullscreen is enabled. I also noticed I'm getting the SEC7118 message: XMLHttpRequest for https://gdata.youtube.com/feeds/api/videos/qywzeXowktA?v=2&alt=json required Cross Origin Resource Sharing (CORS). That wouldn't be affecting it, would it?

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  • How do I create a named temporary file on windows in Python?

    - by Chris B.
    I've got a Python program that needs to create a named temporary file which will be opened and closed a couple times over the course of the program, and should be deleted when the program exits. Unfortunately, none of the options in tempfile seem to work: TemporaryFile doesn't have a visible name NamedTemporaryFile creates a file-like object. I just need a filename. I've tried closing the object it returns (after setting delete = False) but I get stream errors when I try to open the file later. SpooledTemporaryFile doesn't have a visible name mkstemp returns both the open file object and the name; it doesn't guarantee the file is deleted when the program exits mktemp returns the filename, but doesn't guarantee the file is deleted when the program exits I've tried using mktemp1 within a context manager, like so: def get_temp_file(suffix): class TempFile(object): def __init__(self): self.name = tempfile.mktemp(suffix = '.test') def __enter__(self): return self def __exit__(self, ex_type, ex_value, ex_tb): if os.path.exists(self.name): try: os.remove(self.name) except: print sys.exc_info() return TempFile() ... but that gives me a WindowsError(32, 'The process cannot access the file because it is being used by another process'). The filename is used by a process my program spawns, and even though I ensure that process finishes before I exit, it seems to have a race condition out of my control. What's the best way of dealing with this? 1 I don't need to worry about security here; this is part of a testing module, so the most someone nefarious could do is cause our unit tests to spuriously fail. The horror!

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  • Printing PDFs Server-side using Acrobat Reader from ASP.NET

    - by Chris Roberts
    Hi, I have been presented with a problem which requires me to print PDF files from a server as part of an ASP.NET web service. The problem is further complicated by the fact that the PDF files I have to print can ONLY be printed using Adobe Reader (they were created using Adobe LiveCycle and have some strange protection in them). This piece of code seems to do the trick in the Visual Studio development web server, but doesn't do anything when the site's running in IIS. I'm assuming this is probably some sort of permissions issue!? I know this is a FAR from ideal thing to be trying to do, but I haven't really got much choice! Any ideas would be greatly appreciated! Dim starter As ProcessStartInfo Dim Prc As Process ' Pass File Path And Arguments starter = New ProcessStartInfo("c:\program files\...\AcroRd32.exe", "/t ""test.pdf"" ""Printer""") starter.CreateNoWindow = True starter.RedirectStandardOutput = True starter.UseShellExecute = False ' Start Adobe Process Prc = New Process() Prc.StartInfo = starter Prc.Start()

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  • Best way to cache resized images using PHP and MySQL

    - by Chris Hawes
    What would be the best practice way to handle the caching of images using PHP. The filename is currently stored in a MySQL database which is renamed to a GUID on upload, along with the original filename and alt tag. When the image is put into the HTML pages it is done so using a url such as '/images/get/200x200/{guid}.jpg which is rewritten to a php script. This allows my designers to specify (roughly - the source image maybe smaller) the file size. The php script then creates a hash of the size (200x200 in the url) and the GUID filename and if the file has been generated before (file with the name of the hash exists in TMP directory) sends the file from the application TMP directory. If the hashed filename does not exist, then it is created, written to disk and served up in the same manner, Is this efficient as it could be? (It also supports watermarking the images and the watermarking settings are stored in the hash as well, but thats out of scope for this.)

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  • Debugging: Attach to Process for Console App running inside cmd.exe

    - by Chris
    How do you "Attach to Process..." for a console application thats running from a CMD window and not launched by F5? The reason I ask is because the application takes command line arguments and I want to have a genuine experience. I've even attaching to CMD.exe, but no luck, or setting a break-point using Console.ReadKey() with also no luck. I'm kind of at a loss here. Is this possible?

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  • vBulletin Nightmare

    - by Chris
    I am creating a vBulletin forum community called: wehypnosis We purchased the vBulletin version 4.0 CMS and the SEO plugin. Im used to designing and building templates for drupal, wordpress and joomla. All of which have great documentation and many tutorials built by the community. But vBulletin although claimed as the best forum software on the internet, is missing any form of documentation worth reading. The only thing I can find to help me rebuild this monster is www.vbulletin.com/docs/ Does anyone know of a set of tutorials or any documentation which would help me: Configure a good solid working version? Give detailed instruction on how to build themes for vBulletin? Drupal has a mountain of great books and resources. Does vBulletin?

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