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  • Django/Python best practice template_dict

    - by fredrik
    Hi, After just been coding for about 6-9 months. I probably changed my coding style a number of times after reading some code or read best practices. But one thing I haven't yet come a cross is a good why to populate the template_dict. As of now I pass the template_dict across a number of methods (that changes/modifies it) and returns is. The result is that every methods takes template_dict as first argument and the returns it and this in my eyes doesn't seems to be the best solution. An idea is to have a method that handles all the changes. But I'm curios if there's a best practice for this? Or is it "do what you feel like"-type of thing? The 2 things I think is pretty ugly is to send as an argument and return it in all methods. And the just the var name is written xxx number of times in the code :) ..fredrik

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  • How to use Mesa3D on Mac OS X and Windows

    - by gutsblow
    Hello all, I need to use Mesa3D for a cross platform application(windows and Mac only) which uses only offline software rendering. The reason I wanted to use Mesa3D is because it has the same Drawing calls as OpenGL and they are really easy. Now I know that Apple itself has a software implementation (which I heard is flaky), but I prefer using Mesa so that it's a lot easier for me to maintain the code on both platforms. On windows I managed to compile three DLL's from the Mesa3d source, but don't know what to do with them. On Mac OS X I am completely clueless. I would highly appreciate your help. Thank you once again very much!

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  • Chipmunk Physics or Box2D for C++ 2D GameEngine ?

    - by Mr.Gando
    Hello, I'm developing what it's turning into a "cross-platform" 2D Game Engine, my initial platform target is iPhone OS, but could move on to Android or even some console like the PSP, or Nintendo DS, I want to keep my options open. My engine is developed in C++, and have been reading a lot about Box2D and Chipmunk but still I can't decide which one to use as my Physics Middleware. Chipmunk appears to have been made to be embedded easily, and Box2D seems to be widely used. Chipmunk is C , and Box2D is C++, but I've heard the API's of Box2D are much worse than chipmunk's API's. For now I will be using the engine shape creation and collision detection features for irregular polygons (not concave). I value: 1) Good API's 2) Easy to integrate. 3) Portability. And of course if you notice anything else, I would love to hear it. Which one do you think that would fit my needs better ?

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  • How to organize a ASP.NET MVC solution (DDD)

    - by vandalo
    Hello everyone. I am trying to start a new project (asp.net MVC) and I would like to apply some DDD rules I've learned in these last few months. I don't know how to organize my solution though. I would like to use Nhibernate but I don't want to use Fluent Nhibernate cause it must be something like an experiment. I've seen some examples where people keep everything in the same project. Some others tend to create a different project for everything. Do you think I should differentiate the model and the repository or put it in the same project? If someone has some links to articles etc it would be appreciated. thanks Alberto

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  • Image Viewer application, Image processing with Display Data.

    - by Harsha
    Hello All, I am working on Image Viewer application and planning to build in WPF. My Image size are usually larger than 3000x3500. After searching for week, I got sample code from MSDN. But it is written in ATL COM. So I am planning to work and build the Image viewer as follows: After reading the Image I will scale down to my viewer size, viwer is around 1000x1000. Lets call this Image Data as Display Data. Once displaying this data, I will work only this Display data. For all Image processing operation, I will use this display data and when user choose to save the image, I will apply all the operation to original Image data. My question is, Is is ok to use Display data for showing and initial image processing operations.

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  • How to use Obj-C classes in MacRuby

    - by beno1604
    I am trying to use an external Obj-C class in my MacRuby project, but I can't figure out how to import it. Specifically, I want to use ObjectiveResource inside a MacRuby 0.5 project (since ActiveResource doesn't work - yet). I have gotten as far as the 'framework' command in MacRuby, but it only seems to apply to actual frameworks. Questions: where should I install the objective-resource directory? how do I pull these classes inside my ruby code? Thanks for any help!

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  • Sending most correct mimetype

    - by Roland Franssen
    Hi all, I have a list of extension to mimetype in a INI file. However some extensions have multiple mimetypes, for example; midi[] = "application/x-midi" midi[] = "audio/midi" midi[] = "audio/x-mid" midi[] = "audio/x-midi" midi[] = "music/crescendo" midi[] = "x-music/x-midi" 6 (possible) mimetypes for 1 extension. Whats common practice to determine the correct mimetype? (e.g. i need to set a HTTP content-type header). I know its not ideal; determining mimetypes based on extension.. but i need consistent (cross-server) results (e.g. fileinfo extension in PHP is making terrible guesses*). * Some fileinfo results for example; js - text/plain css - text/c-h

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  • sed/awk or other: increment a number by 1 keeping spacing characters

    - by WizardOfOdds
    I've got a string: (notice the spacing) eh oh 37 and I want it to become: eh oh 36 (so I want to keep the spacing) Using awk I don't find how to do it, so far I have: echo "eh oh 37" | awk '$3>=0&&$3<=99 {$3--} {print}' But this gives: eh oh 36 (the spacing characters where lost, because the field separator is ' ') Is there a way to ask awk something like "print the output using the exact same field separators as the input had"? Then I tried with sed, but got stuck after this: echo "eh oh 37" | sed -e 's/\([0-9][0-9]\)/.../' Can I do arithmetic from sed using a reference to the matching digits and have the output not modify the number of spacing characters? Note that it's related to my question concerning Emacs and how to apply this to some (big) Emacs region (using a replace region with Emacs's shell-command-on-region) but it's not an identical question: this one is specifically about how to "keep spaces" when working with awk/sed/etc.

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  • Zend Framework - applying order by on a nested query

    - by Gublooo
    Hey guys This might be a very simple thing. Check out the normal sql query below (select * from shopping order by shopping_id desc limit 5) order by RAND() This query runs successfully in mysql - not sure if this is the right way of doing it - but it works. It gets the last 5 ids from shopping table and randomly orders them everytime I want to achieve this in Zend. I'm not sure how to execute the first part and then apply the RAND clause to the results - what I have below does not do that. $select = $this-select() -from(array('sh'='shopping')) -order('shopping_id desc') -limit(5) -order('RAND()');

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  • Visual Studio 2010 shortcut to select word / expression / line / section / method?

    - by Lernkurve
    There is a shortcut Ctrl+Shift+W to select the entire word at the current cursor position. Is there a similar shortcut that keeps expanding the selected region every time I apply it? I mean, is there a shortcut which selects the word when applied once (same as Ctrl+Shift+W) and selects the entire line when applied twice in a row and selects the entire block when applied three times etc., i.e. keeps expanding the selected region step by step? I remember seeing such a shortcut, but I don't remember whether it was for Visual Studio or some other editor.

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  • Styling a hr for internet explorer

    - by Qwibble
    Hey, in my quest to create as image light a site as possible, I'm looking to create two tone hr's. I've achieved this in modern browsers, but want to achieve the same effect in ie6 and 7. The current code I am using is hr { border-bottom:1px solid #FFFFFF; border-top:1px solid #dcdcdc; clear:both; height:0; border-left:0px; border-right:0px; } I've tried, with no success to make this work in ie6 and 7 without having to target the browsers specifically. Any thoughts? (Heres my current project where I am employing this code, and looking to make it cross browser - http://www.qwibbledesigns.co.uk/preview/aurelius/ ) Cheers Matt

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  • Machine Learning Algorithm for Parallel Nodes

    - by FreshCode
    I want to apply machine learning to a classification problem in a parallel environment. Several independent nodes, each with multiple on/off sensors, can communicate their sensor data with the goal of classifying an event defined by a heuristic, training data or both. Each peer will be measuring the same data from their unique perspective and will attempt to classify the result while taking into account that any neighbouring node (or its sensors or just the connection to the node) could be faulty. Nodes should function as equal peers and determine the most likely classification by communicating their results. Ultimately each node should make a decision based on their own sensor data and their peers' data. If it matters, false positives are OK (albeit undesirable) but false negatives are totally unacceptable. Given that each final classification will receive good or bad feedback, what would be an appropriate machine learning algorithm to approach this problem with if the nodes could communicate with each other to determine the most likely classification?

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  • How would I best address this object type heirachy? Some kind of enum heirarchy?

    - by FerretallicA
    I'm curious as to any solutions out there for addressing object heirarchies in an ORM approach (in this instance, using Entity Framework 4). I'm working through some docs on EF4 and trying to apply it to a simple inventory tracking program. The possible types for inventory to fall into are as follows: INVENTORY ITEM TYPES: Hardware PC Desktop Server Laptop Accessory Input (keyboards, scanners etc) Output (monitors, printers etc) Storage (USB sticks, tape drives etc) Communication (network cards, routers etc) Software What recommendations are there for handling enums in a situation like this? Are enums even the solution? I don't really want to have a ridiculously normalised database for such a relatively simple experiment (eg tables for InventoryType, InventorySubtype, InventoryTypeToSubtype etc). I don't really want to over-complicate my data model with each subtype being inherited even though no additional properties or methods are included (except PC types which would ideally have associated accessories and software but that's probably out of scope here). It feels like there should be a really simple, elegant solution to this but I can't put my finger on it. Any assistance or input appreciated!

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  • Connecting two Windows XP with MSMQ

    - by NealWalters
    This question is a cross between a developer and a server setup question. I asked on Serverfault but no answer yet. As a developer, I need to setup a test to see how MSMQ works between two machines, and I'm unclear what to do. I will use C# or BizTalk to do the read/write to/from the queues. I have MSMQ installed on two Windows XP computers. Can I configure them to pass messages back and forth, or do I need an MSMQ server in the middle? If I need an MSMQ server, does the normal MSMQ with Win2003 able to act as that? And then, how do I connect my Windows XP to that Windows 2003 server? Is it a) On screen admin dialog in the MSMQ plug-in to MMC, b) a config file, c) Active Directory, d) something else? Thanks, Neal Walters

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  • Issue with python string join.

    - by Pradyot
    I have some code in which I apply a join to a list. The list before the join looks like this: ["'DealerwebAgcy_NYK_GW_UAT'", "'DealerwebAgcy'", "'UAT'", '@ECNPhysicalMarketCo nfigId', "'GATEWAY'", "'DEALERWEB_MD_AGCY'", "'NU1MKVETC'", "'mkvetcu'", "'C:\te mp'", '0', "'NYK'", '0', '1', "'isqlw.exe'", 'GetDate()', '12345', "'NYK'", '350 ', '7'] After the join this is the resulting string 'DealerwebAgcy_NYK_GW_UAT','DealerwebAgcy','UAT',@ECNPhysicalMarketConfigId,'GAT EWAY','DEALERWEB_MD_AGCY','NU1MKVETC','mkvetcu','C: emp',0,'NYK',0,1,'isqlw. exe',GetDate(),12345,'NYK',350,7 Note the element "'C:\temp'" which ends up as ,'C: emp', I tried something similar on the python command prompt , but I wasn't able to 2 repeat this. the relevant code responsible for this magic is as follows. values_dict["ECNMarketInstance"] = [strVal(self.EcnInstance_),strVal (self.DisplayName_) ,strVal(self.environment_), '@ECNPhysicalMarketConfigId', strVal(self.EcnGatewaTypeId_),strVal(self.ConnectionComponent_) ,strVal(self.UserName_),strVal(self.Password_),strVal(self.WorkingDir_),"0",strVal(self.region_),"0","1", strVal(self.LUVersion_), "GetDate()" , self.LUUserId_ ,strVal(self.LUOwningSite_),self.QuoteColumnId_ , self.Capabilities_] delim = "," joined = delim.join(values) print values print joined

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  • Rotation Interpolation

    - by Rob
    Hello, NB: I'll present this question in degrees purely for simplicity, radians, degrees, different zero-bearing, the problem is essentially the same. Does anyone have any ideas on the code behind rotational interpolation? Given a linear interpolation function: Lerp(from, to, amount), where amount is 0...1 which returns a value between from and to, by amount. How could I apply this same function to a rotational interpolation between 0 and 360 degrees? Given that degrees should not be returned outside 0 and 360. Given this unit circle for degrees: where from = 45 and to = 315, the algorithm should take the shortest path to the angle, i.e. it should go through zero, to 360 and then to 315 - and not all the way round 90, 180, 270 to 315. Is there a nice way to achieve this? Or is it going to just be a horrid mess of if() blocks? Am I missing some well understood standard way of doing this? Any help would be appreciated.

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  • Javascript: how to tell if a node object has been inserted into a document/another element yet

    - by thomasrutter
    I'd like to be able to identify whether a given DOM node has been appended/inserted into another node yet, or whether it is fresh out of document.createElement() or similar and has not been placed anywhere. In most browsers just checking the parentNode works. if (!node.parentNode) { // this node is not part of a larger document } However, in Internet Explorer it appears that new elements, even right after they've been created with document.createElement() already have a parentNode object (of type DispHTMLDocument??). Any other nice cross-browser and reliable way? Edit: looks like Internet Explorer is implicitly creating a DocumentFragment (with nodeType of 11) and setting that as the node's parentNode property.

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  • ZooKeeper and RabbitMQ/Qpid together - overkill or a good combination?

    - by Chris Sears
    Greetings, I'm evaluating some components for a multi-data center distributed system. We're going to be using message queues (via either RabbitMQ or Qpid) so agents can make asynchronous requests to other agents without worrying about addressing, routing, load balancing or retransmission. In many cases, the agents will be interacting with components that were not designed for highly concurrent access, so locking and cross-agent coordination will be needed to avoid race conditions. Also, we'd like the system to automatically respond to agent or data center failures. With the above use cases in mind, ZooKeeper seemed like it might be a good fit. But I'm wondering if trying to use both ZK and message queuing is overkill. It seems like what Zookeeper does could be accomplished by my own cluster manager using AMQP messaging, but that would be hard to get really right. On the other hand, I've seen some examples where ZooKeeper was used to implement message queuing, but I think RabbitMQ/Qpid are a more natural fit for that. Has anyone out there used a combination like this? Thanks in advance, -Chris

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  • How to select the first row for each group in MySQL?

    - by Jader Dias
    In C# it would be like this: table .GroupBy(row => row.SomeColumn) .Select(group => group .OrderBy(row => row.AnotherColumn) .First() ) Linq-To-Sql translates it to the following T-SQL code: SELECT [t3].[AnotherColumn], [t3].[SomeColumn] FROM ( SELECT [t0].[SomeColumn] FROM [Table] AS [t0] GROUP BY [t0].[SomeColumn] ) AS [t1] OUTER APPLY ( SELECT TOP (1) [t2].[AnotherColumn], [t2].[SomeColumn] FROM [Table] AS [t2] WHERE (([t1].[SomeColumn] IS NULL) AND ([t2].[SomeColumn] IS NULL)) OR (([t1].[SomeColumn] IS NOT NULL) AND ([t2].[SomeColumn] IS NOT NULL) AND ([t1].[SomeColumn] = [t2].[SomeColumn])) ORDER BY [t2].[AnotherColumn] ) AS [t3] ORDER BY [t3].[AnotherColumn] But it is uncompatible with MySQL.

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  • Rhapsody TestConductor Experiences

    - by vaiomike
    I was wondering whether anybody out there is actively using Rhapsody TestConductor? Or has tried it for a while, but then decided to turn it down for a particular reason? If so, what are your experiences, in which field do you apply it, what are the shortcomings, or why did you turn it down? At the moment we're considering TestConductor as our tool of choice for testing as it's already integrated into Rhapsody, and would like to find out how applicable it is to our project (btw, we're using Rhapsody 7.4 in C). P.S: Recommendations on good books about Model Based Testing are also appreciated.

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  • How to subclass a specific jqueryui widget method ?

    - by SBUJOLD
    Since I updated jQueryUI to 1.8 I found a couple of issues in our implementations and I could fix it myself without waiting for a fix on their end if I could find out how to subclass a specific method of the datepicker widget so I call the parent code and then execute my code. I was reading on $.widget but I just can't wrap my head around how that is suppose to work. I tried something like this: $.widget("ui.datepicker", { _showDatepicker: function(input) { alert('Yo'); $.datepicker.prototype._showDatepicker.apply(this,arguments); alert('Hey!'); } }); And all sorts of other variations and beging to think I just don't understand the 'extendability' of jQueryUI or it just can't be done. Anybody knows how I can achieve this ? Thx

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  • xml with special character, encoding utf-8

    - by Sergio Morieca
    I have a few simple questions, because I got confused reading all difference responses. 1) If I have an xml with prolog: and I'm going to unmarshall it with Java (for example: JaXB). I suppose, that I can't put CROSS OF LORRAINE (http://www.fileformat.info/info/unicode/char/2628/index.htm) inside, but I can put "\u2628", correct? 2) I've also heard that UTF-8 doesn't contain it, but anything in Unicode can be saved with encoding UTF-8 (or UTF-16), and here is an example from this page: UTF-8 (hex) 0xE2 0x98 0xA8 (e298a8) Is my reasoning correct? Can I use this form and put it in the xml with utf-8 encoding?

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  • Polygon area calculation using Latitude and Longitude generated from Cartesian space and a world fil

    - by Heath
    Given a series of GPS coordinate pairs, I need to calculate the area of a polygon (n-gon). This is relatively small (not larger than 50,000 sqft). The geocodes are created by applying an affine transform with data from a world file. I have tried to use a two step approach by doing converting the geocodes to cartesian coordinates: double xPos = (lon-lonAnchor)*( Math.toRadians( 6378137 ) )*Math.cos( latAnchor ); double yPos = (lat-latAnchor)*( Math.toRadians( 6378137 ) ); then I use a cross product calculation to determine the area. The issue is that the results are a bit off in accuracy (around 1%). Is there anything I can look into to improve this? Thanks.

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  • Boost graph libraries: setting edge weight values

    - by AndyUK
    I am investigating the use of the boost graph libraries in order to apply them to various network problems I have in mind. In the examples I have been looking at the graph edge values ("weights") are always initialized as integers, such as in these Bellman-Ford and Kruskal algorithms eg: int weights[] = { 1, 1, 2, 7, 3, 1, 1, 1 }; My problem is if I try and change the weights to double, I get a heap of warning messages about conversions etc, which so far I have not been able to figure out how to overcome. Does anyone see a way around this?

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  • CFSocketConnectToAddress and unrecognized selector sent to instance

    - by madmik3
    Hello, I am somewhat new to iPhone dev and I have been getting unrecognized selector when I call CFSocketConnectToAddress in this code. I think it might be something basic that I am doing wrong. Any idea? this is the complete error I get. NSInvalidArgumentException unrecognized selector sent to instance 0x3922170 0x3922170 is the calling class. - (BOOL)connect { CFSocketRef mySocket = CFSocketCreate(kCFAllocatorDefault, PF_INET, SOCK_DGRAM,IPPROTO_UDP, 0, socketCallback, NULL); @try { CFDataRef data = (CFDataRef)[_netService addresses]; CFSocketConnectToAddress(mySocket, data, 500); } @catch (NSException * e) { NSLog([e name]); NSLog([e reason]); } //char joke[] = "Why did the chicken cross the road?"; //CFSocketError err = CFSocketSendData(mySocket, joke, (strlen(joke)+1), 10); return true; } void socketCallback ( CFSocketRef s, CFSocketCallBackType callbackType, CFDataRef address, const void *data, void *info) { }

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