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• F# &ndash; It&rsquo;s time to grow up baby.

  - by MarkPearl

  In the last few months since I started learning F# I have begin to notice an increase in the number of people blogging about the language. Sure, it could just be that I am noticing it more because I am actively looking out for questions and blog posts, but even in my day to day reading of Code Project Daily News and Stack Overflow questions there seems to be increased activity around the language. So what sparked this post? Well, today today I logged in and saw that the latest podcast by DNR was on F# and then immediately afterwards I received an email from CodeProject with a great article comparing F# and Scala. Currently, as of this blog posting (21 May 2010) F# is ranked on the tiobe site at position 43, but I am willing to put money on it that in the next few tiobe ratings this ranking will continue to rise till F# will be a top 20.

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• VS 11 vs VS 2012 [closed]

  - by Alex

  I'm using Visual Studio 11 Beta at home, mainly for learning purposes. But now it's possible to download VS 2012 RC. Does it make sense to install it instead? Does it have many changes comparing with VS 11? I know that VS 11 doesn't work with Azure, was it fixed in VS 2012? EDIT: Actually I found this: What’s new in the RC since Beta, which describes changes in RC and if I decide to install it, I don't need to uninstall previous version: We’ve enabled upgrade from beta to RC, so if you’re using the same product edition (e.g. Professional, Ultimate, etc.), you do not need to uninstall the beta first. Simply run the Visual Studio 2012 RC installer, which will uninstall the right Beta bits and lay down the RC bits, all at once.

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• Determining Whether a String Is Contained Within a String Array (Case Insensitive)

  About once every couple of months I need to write a bit of code that does one thing if a particular string is found within an array of strings and something else if it is not ignoring differences in case. For whatever reason, I never seem to remember the code snippet to accomplish this, so after spending 10 minutes of research today I thought I'd write it down here in an effort to help commit it to memory or, at the very least, serve as a quick place to find the answer when the need arises again.So without further adieu, here it is:Visual Basic Version:If stringArrayName.Contains("valueToLookFor", StringComparer.OrdinalIgnoreCase) Then ... Else ... End IfC# Version:if (stringArrayName.Contains("valueToLookFor", StringComparer.OrdinalIgnoreCase)) ... else ...Without the StringComparer.OrdinalIgnoreCase the search will be case-sensitive. For more information on comparing strings, see: New Recommendations for Using Strings in Microsoft .NET 2.0.Happy Programming!Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Custom graph comparison?

  - by user57828

  I'm trying to compare two graphs using hash value ( i.e, at the time of comparison, try to avoid traversing the graph ) Is there a way to make a function such that the hash values compared can also lead to determining at which height the graphs differ? The comparisons between two graphs are to be made by comparing children at a certain level. One way to compare the graphs is have a final hash value for the root node and compare them, but that wouldn't directly reflect at which level the graphs differ, since their immediate children might be the same ( or any other case ).

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• How well do free-to-open-source-projects policies work in practice?

  - by Steve314

  In comparison with an open source license and requesting donations, is a free-for-open-source-projects (or free for non-commercial developers) closed source and otherwise commercial project likely to get more license fees? Or just to alienate potential users? Assume the project has value to programmers - I'm looking for generalizations here, though specific examples comparing existing projects will be very interesting. What I have in mind involves code generating programming utilities. And one issue I can think of, either way, is a near total inability to enforce any license restrictions. After all, I can't go around the internet demanding that everyone show me their source code just in case!

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• Checking for DBNull

  - by Jim Lahman

  Using a table adapter to a SQL Server database table that returns a NULL record.  We determine the fields are NULL by comparing against System.DBNull Looking the NULL records in SQL Management studio   Using a table adapter to retrieve a record   1: try 2: { 3: this.vTrackingTableAdapter.FillByTrkZone(this.dsL1Write.vTracking, iTrkZone); 4: } 5: catch (Exception ex) 6: { 7: sLogMessage = String 8: .Format("Error getting coil number from tracking table at {0} - {1}", 9: sTrkName, 10: ex.Message); 11: throw new CannotReadTrackingTableException(sLogMessage); 12: }   Looking at the record as it returned from the table adapter:   ItemArrayObject Column [0] ChargeCoilNumber [1] HeadWeldZone [2] TailWeldZone [3] ZoneLen [4] ZoneCoilLen [5] Confirmed [6] Validated [7] EntryWidth [8] EntryThickness   Since each item in the ItemArray is an object, we can test for null   1: if (dsL1Write.vTracking.Rows[0].ItemArray[0] == System.DBNull.Value) 2: { 3: throw new NoCoilAtPORException("NULL coil found at tracking zone " + sTrkName); 4: }   If no records were returned by the table adapter 1: if (dsL1Write.vTracking.Rows.Count == 0) 2: { 3: throw new NoCoilAtPORException("No coils found at tracking zone " + sTrkName); 4: }

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• SSD-HDD price parity

  - by jchang

  It is hard to believe that we are essentially at SSD-HDD price parity? Of course I am comparing enterprise class 10K/15K HDDs to consumer grade SSDs. Below are prices I am seeing 300GB 15K HDD $370 900GB 10K HDD $600 1TB 7200 HDD $230 (less for consumer HDDs) 512GB SATA SSD $400-600 Intel SSD DC S3700 400GB $940 The 512GB SATA SSDs are consumer grade, MLC NAND, with only 7% over provisioning. That is 512GB (1GB = 2^30) of NAND, with 512GB (1GB =10^9) of user capacity. Intel just announced the SSD...(read more)

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• From where does the game engines add location of an object?

  - by Player

  I have started making my first game( a pong game )with ruby (Gosu). I'm trying to detect the collision of two images using their location by comparing the location of the object (a ball) to another one(a player). For example: if (@player.x - @ball.x).abs <=184 && (@player.y - @ball.y).abs <= 40 @ball.vx = [email protected] @ball.vy = [email protected] But my problem is that with these numbers, the ball collides near the player sometimes, even though the dimensions of the player are correct. So my question is from where does the x values start to count? Is it from the center of gravity of the image or from the beginning of the image? (i.e When you add the image on a specific x,y,z what are these values compared to the image?

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• Get collision details from Rectangle.Intersects()

  - by Daniel Ribeiro

  I have a Breakout game in which, at some point, I detect the collision between the ball and the paddle with something like this: // Ball class rectangle.Intersects(paddle.Rectangle); Is there any way I can get the exact coordinates of the collision, or any details about it, with the current XNA API? I thought of doing some basic calculations, such as comparing the exact coordinates of each object on the moment of the collision. It would look something like this: // Ball class if((rectangle.X - paddle.Rectangle.X) < (paddle.Rectangle.Width / 2)) // Collision happened on the left side else // Collision happened on the right side But I'm not sure this is the correct way to do it. Do you guys have any tips on maybe an engine I might have to use to achieve that? Or even good coding practices using this method?

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• Detect if square in grid is within a diamond shape

  - by myrkos

  So I have a game in which basically everything is a square inside a big grid. It's easy to check if a square is inside a box whose center is another square: *** x *o* --> x is not in o's square *** **x *o* --> x IS in o's square *** This can be done by simply subtracting the coordinates of o and x, then taking the largest coordinate of that and comparing it with the half side length. Now I want to do the same thing but check if x is in o's diamond, like so: * **x **o** --> x IS in o's diamond *** * What would be the best way to check if a square is in another square's surrounding diamond-shaped area, given the diamond's half width/height?

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• LuaJit FFI and hiding C implementation details

  - by wirrbel

  I would like to extend an application using LuaJit FFI. Having seen http://luajit.org/ext_ffi_tutorial.html this is surprisingly easy when comparing this to the Lua C API. So far so good. However I do not plainly want to wrap C functions but provide a higher level API to users writing scripts for the application. Especially I do not want users to be able to access "primitives", i.e. the ffi.* namespace. Is this possible or will that ffi namespace be available to user's Lua scripts? On the issue of Sandboxing Lua I found http://lua-users.org/wiki/SandBoxes which is not talking about FFI though. Furthermore, the plan I have described above is assuming that the introduction of abstraction layers happens on the lua side of code. Is this an advisable approach or would you rather abstract functionality on the statically compiled code (on the C-side)?

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• The how of a collision engine

  - by JXPheonix

  This is a very, very broad question - what is the general algorithm of how a collision engine works? No code in specific, but rather, just a general idea of how a collision engine does what it does, constantly refreshing the points of an object and comparing it to other objects? (see, I have the general gist of it here.) A collision engine is basically an engine used in games (generally) so that your player (call him Bob), whenever bob moves into a wall, Bob stops, Bob does not walk through the wall. They also generally handle the gravity in a game and environmental things like that.

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• Which office suite is the ideal alternative to MSOffice?

  - by user64720

  Let's say I want to drop MSOffice permanently and switch to a free alternative, not having the need of opening the documents on other PC's except my own (I can also carry a portable version on a pendrive and edit the docs anywhere). I know 3 free office suites - LibreOffice, Abiword and Calligra. Which one of these is the most complete and provides the best features to be a viable alternative to MSOffice, without compromising the quality of the work I can produce on Office apps? Notice that I'm not focusing the question on compatibility between MSOffice and other suites but instead I am comparing their quality, taking in comparison MSOffice.

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• XNA Drag Gestures - fractional delta values

  - by Den

  I have an issue with objects moving roughly twice as far as expected when dragging them. I am comparing my application to the standard TouchGestureSample sample from MSDN. For some reason in my application gesture samples have fractional positions and deltas. Both are using same Microsoft.Xna.Framework.Input.Touch.dll, v4.0.30319. I am running both apps using standard Windows Phone Emulator. I am setting my break point immediately after this line of code in a simple Update method: GestureSample gesture = TouchPanel.ReadGesture(); Typical values in my app: Delta = {X:-13.56522 Y:4.166667} Position = {X:184.6956 Y:417.7083} Typical values in sample app: Delta = {X:7 Y:16} Position = {X:497 Y:244} Have anyone seen this issue? Does anyone have any suggestions? Thank you.

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• Should SpecFlow be used with BDD as a solo developer?

  - by baens

  I am a long time fan of TDD and after reading the RSpec book, would like to transistion to a BDD process. I like the idea of driving from the outside in, as it is presented in the book. What I am having a hard time getting a handle on is how to structure the tests. I have tried SpecFlow, but it seems cumbersome to use when I am the only one really ever going to be looking at the tests. I like the idea of just using straight NUnit, rather then adding another framework, like it is presented here. Is this a good way to try and structure BDD tests? Is there more information out there on comparing the two ways (that may even be more recent)?

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• Array manipulation in gsettings' set command

  - by Daniel

  Is there an easy way to do array manipulation in gsettings? I am comparing gsettings to OS X's defaults command that offers the defaults domain --array key overwrite-value and defaults domain --array-add key added-value interface for manipulating arrays. As far as I can tell there is only gsettings set domain key "['overwrite-value']" available to gsettings. Not really pretty for when you want to add or remove one entry from an array. I have seen a suggestion that allow me to add to an array, but I would rather use a interface if there is one.

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• EAV - is it really bad in all scenarios?

  - by Giedrius

  I'm thinking to use EAV for some of the stuff in one of the projects, but all questions about it in stackoverflow end up to answers calling EAV an anti pattern. But I'm wondering, if is it that wrong in all cases? Let's say shop product entity, it has common features, like name, description, image, price, etc., that take part in logic many places and has (semi)unique features, like watch and beach ball would be described by completely different aspects. So I think EAV would fit for storing those (semi)unique features? All this is assuming, that for showing product list, it is enough info in product table (that means no EAV is involved) and just when showing one product/comparing up to 5 products/etc. data saved using EAV is used. I've seen such approach in Magento commerce and it is quite popular, so may be there are cases, when EAV is reasonable?

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• Updating query results

  - by Francisco Garcia

  Within a DDD and CQRS context, a query result is displayed as table rows. Whenever new rows are inserted or deleted, their positions must be calculated by comparing the previous query result with the most recent one. This is needed to visualize with an animation new or deleted rows. The model of my view contains an array of the displayed query results. But I need a place to compare its contents against the latest query. Right now I consider my model view part of my application layer, but the comparison of two query result sets seems something that must be done within the domain layer. Which component should cache a query result and which one compare them? Are view models (and their cached contents) supposed to be in the application layer?

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• Data architecture for event log metrics?

  - by elliot42

  My service has a large ongoing number of user events, and we would like to do things like "count occurrence of event type T since date D." We are trying to make two basic decisions: What to store? Storing every event vs. only storing aggregates (Event log style) log every event and count them later, vs. (Time-series style) store a single aggregated "count of event E for date D" for every day Where to store the data In a relational database (particularly MySQL) In a non-relational (NoSQL) database In flat log files (collected centrally over the network via syslog-ng) What is standard practice / where can I read more about comparing the different types of systems? Additional details: The total event stream is large, potentially hundreds of thousands of entries per day But our current need is only to count certain types of events within it We don't necessarily need real-time access to the raw data or aggregation results IMHO, "log all events to files, crawl them at a later time to filter and aggregate the stream" is a pretty standard UNIX Way, but my Rails-y compatriots seem to think that nothing is real unless it's in MySQL.

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• Speaking in Omaha: December 7, 2011

  - by Bill Graziano

  I’m presenting in Omaha on Writing Faster SQL at 6PM on December 7th.  You can find meeting details on the Omaha SQL Server User Group page. The meeting location requires an RSVP so building security has a list of attendees. The presentation is a series of suggestions on improving performance.  It ranges from simple things like comparing indexed columns to scalar values up to tips for reducing query compiles and asynchronous processing patterns.  Nearly all of these come from specific issues I’ve encountered working on poorly performing SQL Servers.

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• When calculating how many days between 2 dates, should you include both dates in the count, or neither, or 1?

  - by Andy

  I hope this question is alright to ask here. I am trying to make an algorithm that counts how many days between 2 dates. For example, 3/1/2012 and 3/2/2012. Whats the correct answer, or the most popular choice, and should be the one I use? So in this case, if I don't include both dates I am comparing, its 0. If I include one of them (both the start date), its 1. Lastly, if I include both, its 2. Thanks.

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• What is the best agile project management technique for developing innovative software systems?

  - by user654019

  I am involved with the development of innovative software. The development is innovative since we don't know how to develop it and what algorithm should we use to implement and nobody else did it before. The process consists of several stages of studying books/papers, suggesting algorithms, writing prototypes and comparing the result with actual data. We hope that after some iteration, we converge to a valid software system. What is the best project management approach that we can use? Is there any project management software for these types of projects?

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• Performance impact of the new mtmalloc memory allocator

  - by nospam(at)example.com (Joerg Moellenkamp)

  I wrote at a number of occasions (here or here), that it could be really beneficial to use a different memory allocator for highly-threaded workloads, as the standard allocator is well ... the standard, however not very effective as soon as many threads comes into play. I didn't wrote about this as it was in my phase of silence but there was some change in the allocator area, Solaris 10 got a revamped mtmalloc allocator in version Solaris 10 08/11 (as described in "libmtmalloc Improvements"). The new memory allocator was introduced to Solaris development by the PSARC case 2010/212. But what's the effect of this new allocator and how does it works? Rickey C. Weisner wrote a nice article with "How Memory Allocation Affects Performance in Multithreaded Programs" explaining the inner mechanism of various allocators but he also publishes test results comparing Hoard, mtmalloc, umem, new mtmalloc and the libc malloc. Really interesting read and a must for people running applications on servers with a high number of threads.

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• What are the caveats of the event system built on Messenger rather than on classic .NET events?

  - by voroninp

  MVVM Light and PRISM offer messenger to implement event system. the approximate interface looks like the following one: interface Messanger { void Subscribe<TMessageParam>(Action<TMessageParam> action); void Unsubscribe<TMessageParam>(Action<TMessageParam> action); void Unsubscribe<TMessageParam>(objec actionOwner); void Notify<TMessageParam>(TMessageParam param); } Now this model seems beneficial comparing to classic .net events. It works well with Dependency Injection. Actions are stored as weak references so memory leaks are avioded and unsubscribe is not a must. The only annoyance is the need to declare new TMessageParam for each specific message. But everything comes at a cost. And what I'm really worried about is that I see no shortcomings of this approach. Has anoyne the experience of some troubles with this design pattern?

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• Using Git in Enterprise environment

  - by sarat

  Git is an excellent version control. If we exclude the fact that, it doesn't have an excellent GUI support, it's really good and fast. But the source controls like Clearcase has large support for enterprise customers. Companies investing huge amount for source control servers and licesense. Of late most of the large companies like Google adopting Git over the other version controls. But the company is having strong open source group which consistently provide development and support for the tool (Even they might be having a custom version of Git of their own). At the same time, large companies are not really bothered about adopting open source projects and make it relevant for them. Is Git really a reliable tool for enterprise environment, especially for Windows Platform? The support is a question for Git as it's an open source version control. Any companies are there to provide solutions and support? How the server costs comparing to other version controls like Clear-case?

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