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• Desiging a AJAX website

  - by Narmatha Balasundaram

  What are the things to consider and watch out for when designing a website with AJAX? Must take care of conditions, say timeouts, error handling, for instance? Best practices? What parameters to take care of while designing and coding?

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• Accessing raw touch data from iPhone screen

  - by Adam

  I know Apple went to a lot of trouble to convert a big blob of touch data to a nice single point, and I appreciate it, but does anyone know how to access the raw data before it's processed? Official or unofficial method, it doesn't matter.

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• Rhino Mocks - Do we really need stubs?

  - by Marcelo Oliveira

  If it's possible to change mock behaviour in Rhino Mocks using mock.Stub().Return(), why do we need Stubs anyway? What do we lose by always using MockRepository.GenerateMock()? One big benefit of using Mocks instead of Stubs is that we will be able to reuse the same instance among all the tests keeping them cleaner and straightforward. The moq framework works in a similar way... we don't have different objects for mocks and stubs. (please, don't answer with a link to Fowler's "Mocks aren't stubs" article)

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• approximating log10[x^k0 + k1]

  - by Yale Zhang

  Greetings. I'm trying to approximate the function Log10[x^k0 + k1], where .21 < k0 < 21, 0 < k1 < ~2000, and x is integer < 2^14. k0 & k1 are constant. For practical purposes, you can assume k0 = 2.12, k1 = 2660. The desired accuracy is 5*10^-4 relative error. This function is virtually identical to Log[x], except near 0, where it differs a lot. I already have came up with a SIMD implementation that is ~1.15x faster than a simple lookup table, but would like to improve it if possible, which I think is very hard due to lack of efficient instructions. My SIMD implementation uses 16bit fixed point arithmetic to evaluate a 3rd degree polynomial (I use least squares fit). The polynomial uses different coefficients for different input ranges. There are 8 ranges, and range i spans (64)2^i to (64)2^(i + 1). The rational behind this is the derivatives of Log[x] drop rapidly with x, meaning a polynomial will fit it more accurately since polynomials are an exact fit for functions that have a derivative of 0 beyond a certain order. SIMD table lookups are done very efficiently with a single _mm_shuffle_epi8(). I use SSE's float to int conversion to get the exponent and significand used for the fixed point approximation. I also software pipelined the loop to get ~1.25x speedup, so further code optimizations are probably unlikely. What I'm asking is if there's a more efficient approximation at a higher level? For example: Can this function be decomposed into functions with a limited domain like log2((2^x) * significand) = x + log2(significand) hence eliminating the need to deal with different ranges (table lookups). The main problem I think is adding the k1 term kills all those nice log properties that we know and love, making it not possible. Or is it? Iterative method? don't think so because the Newton method for log[x] is already a complicated expression Exploiting locality of neighboring pixels? - if the range of the 8 inputs fall in the same approximation range, then I can look up a single coefficient, instead of looking up separate coefficients for each element. Thus, I can use this as a fast common case, and use a slower, general code path when it isn't. But for my data, the range needs to be ~2000 before this property hold 70% of the time, which doesn't seem to make this method competitive. Please, give me some opinion, especially if you're an applied mathematician, even if you say it can't be done. Thanks.

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• Doubt in Vptr -want to know how it is getting Vtable address

  - by gobi

  Hi all, i wanted to know how vptr getting vtable base address. for instance class A { virtual getdata(); int a; } now, A obj; /// here vptr getting vtable's base address. i wanted to know this mystery.. Thanks in advance

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• Clickable TextView in Android

  - by Cris

  i'm building an Android App that has many many TextView that i want to be clickable. I've tried to assign to the single TextView the properties android:clickable="true" and android:onClick="clickHandler" and when the app fires the clickHandler(View v) i correctly get, through the v.getId(), the clicked item. What i don't like is to define, for every TextView, the properties android:clickable and android:onClick ... is there something that i can do by code to say: "all the textviews are clickable and click is handled in 'clickHandler' ?" Thanks and greetings c

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• Storing GenericForeignKey content_type in another model?

  - by slypete

  I have a typical definition/instance situation in my data modeling. I'm trying to store the content_type of a GenericForeignKey in another model (the definition model) like so: class IndicatorFieldInstance(models.Model): definition = models.ForeignKey(IndicatorField) object_id = models.PositiveIntegerField() content_object = generic.GenericForeignKey(definition.content_type, 'object_id') indicator_instance = models.ForeignKey(IndicatorInstance) I've also tried it like this: content_object = generic.GenericForeignKey('definition__content_type', 'object_id') Neither of these methods seem to work. Is it possible to achieve this? For reference, here's the definition model: class IndicatorField(models.Model): name = models.CharField(max_length='255') content_type = models.ForeignKey(ContentType) indicator = models.ForeignKey(Indicator) Thanks, Pete

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• Python: How do sets work

  - by Guy

  I have a list of objects which I want to turn into a set. My objects contain a few fields that some of which are o.id and o.area. I want two objects to be equal if these two fields are the same. ie: o1==o2 if and only if o1.area==o2.area and o1.id==o2.id. I tried over-writing __eq__ and __cmp__ but I get the error: TypeError: unhashable instance. What should I over-write?

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• `return value' from Constructor Exception in Java?

  - by Lajos Nagy

  Take a look that the following code snippet: A a = null try { a = new A(); } finally { a.foo(); // What happens at this point? } Suppose A's constructor throws a runtime exception. At the marked line, am I always guaranteed to get a NullPointerException, or foo() will get invoked on a half constructed instance?

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• SQL to search duplicates

  - by Ram

  I have a table for animals like Lion Tiger Elephant Jaguar List item Cheetah Puma Rhino I want to insert new animals in this table and I am t reading the animal names from a CSV file. Suppose I got following names in the file Lion,Tiger,Jaguar as these animals are already in "Animals" table, What should be a single SQL query that will determine if the animals are already exist in the table.

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• How to control "Microsoft Speech Recognition" program using c#?

  - by aF

  Hello, I want to know if it's possivble to control "Microsoft Speech Recognition" using c#. Is it possible, for instance, to simulate the click on "On: Listen to everything I say" programmatically using c#?

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• Vim searching through all existing buffers

  - by anon

  When dealing with a single file, 'm sued to: /blah do some work n do some work n do some work Suppose now, I want to search for some pattern over all buffers loaded in Vim, do some work on them, and move on. What commands do I use for this work flow?

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• Change model name in rails easily

  - by Kenji Crosland

  I'm going to need to change one of my model names. Is there anything out there that will replace every instance of the original model name in the controllers views and tests or do I have to do it all manually, page by page?

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• Redirect everything to index.php

  - by pixel

  I'm trying to do clean urls by exploding $_SERVER['REQUEST_URI'] and then switching between the results. However, once a user goes outside index.php, I'm assuming I need to redirect them back to index.php in order to process the URL they want to reach. How can I accomplish this? So for instance, user goes to www.domain.com/home/johndoe/... i'd like the index.php (domain.com/index.php) to be hit so that it can process the /home/johndoe/ via request_uri.

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• How to verify StructureMap is disposing of objects properly

  - by Kevin Pang

  I'm currently using StructureMap to inject instances of NHibernate ISessions using the following code: ObjectFactory.Initialize(x => { x.ForRequestedType<ISession>() .CacheBy(InstanceScope.PerRequest) .TheDefault.Is.ConstructedBy(y => NHibernateSessionManager.Instance.GetSession()); }); I'm assuming that the CacheBy(InstanceScope.PerRequest) will properly dispose of the ISession it creates, but I'd like to make sure. What's the easiest way to test this?

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• CVS branch name from tag name

  - by Jamie

  I have a number of modules in CVS with different tags. How would I go about getting the name of the branch these tagged files exist on? I've tried checking out a file from the module using cvs co -r TAG and then doing cvs log but it appears to give me a list of all of the branches that the file exists on, rather than just a single branch name. Also this needs to be an automated process, so I can't use web based tools like viewvc to gather this info.

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• MVC, can model save/load its data?

  - by fuzzygoat

  Quick question, my data model is a singleton object and it contains a list of names I want archive. My idea is to make the model responsible for loading / saving this data. The ModelLoad will then be called by the ViewControllerviewDidLoad and the ModelSave by ViewControllerapplicationWillTerminate. I could do the load / save directly within the ViewController, but this would be messy as the list of names are on instance variable of the model. gary

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• Is there a way to add a virtual directory to Visual Studio Development Server?

  - by David Hodgson

  Hi, I'm using the Visual Studio Development Server, with a specific port. Is there a way to add a virtual directory to it? EDIT: Sorry, I wasn't very clear. I'd like to be able to add one or more virtual directories to arbitrary physical directories. For instance: http://localhost/c_drive/ would map to C:\, http://localhost:/d_drive/ would map to D:\, etc.

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• Passing values from UIButton to an UIActionSheet

  - by Michael

  I'm trying to send an ActionSheet a variable from a button. I can't use the tag property because its being used for something else. I've declared myIndexRow as an instance variable and have: NSInteger myIndexRow = indexPath.row; [deleteButton addTarget:self action:@selector(showDeleteSheet:) forControlEvents:UIControlEventTouchUpInside]; deleteButton.myIndexRow = myIndexRow; but I'm getting the 'Request for member 'myRow' is something not a structure or union' There is something obvious I am missing here.

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• Difference of two series in MySQL

  - by Brian

  I have a table with the following fields in MySQL: date, Value, Type. Type can be either exports or imports. I want a query that returns the trade deficit (exports-imports) for each month. Is this possible with a single query?

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• How to learn using Hadoop

  - by ajay

  hi, I want to learn hadoop. However, I don't have access to a cluster now. Is it possible for me to learn it and use it for writing programs and learn it properly. Would it be helpful to run multiple linux VMs and then use them as boxes to run hadoop? Or you think that is more of a stretch and running it on a multiple hosts is the same as running in on single host (in terms of setup, Hadoop API used, the architecture of the map-reduce programs etc) Thanks,

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• In-line CSS IE hack

  - by Daimonan

  Is it possible to create, for instance, a box model hack while using in-line CSS? For example: <div id="blah" style="padding: 5px; margin: 5px; width: 30px; /*IE5-6 Equivalent here*/"> Thanks!

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• Security concerns when bridging programming languages.

  - by The Rook

  What security concerns are there when you create a hybrid of languages? For instance using python and java code together with jython, or creating a python module from a C++ library. There are other ways of mixing 2 or more languages. Do you know of an example where this creates a vulnerability?

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• Selecting a Validation Framework - ASP.NET

  - by user102533

  Which validation framework would you prefer for a webforms application. This would be for a rather large complex app. I would want to specify rulesets and business validation in a single place and integrate it both on the client and server side. I'd prefer jquery for client side. Anyone has any suggestions?

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• Set brightness, contrass on selected image

  - by Viral

  hi, I want to set brightness and contrast on the image that is selected from the photo library of iphone, is there any way to do the same using/not using open GLES. I've got some code from the developer.apple.com but that is for a single image and i can't use images from photo library, do any one know please let me know how to this. regards viral.

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