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• 8-direction path finding algorithm

  - by frinkz

  I'm having trouble finding the right pathfinding algorithm for some AI I'm working on. I have players on a pitch, moving around freely (not stuck to a grid), but they are confined to moving in 8 directions (N NE E etc.) I was working on using A*, and a graph for this. But I realised, every node on the graph is equally far apart, and all the edges have the same weight - since the pitch is rectangular. And the number of nodes is enormous (being a large pitch, with them able to move between 1 pixel and another) I figured there must be another algorithm, optimised for this sort of thing?

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• Custom component which displays voice recognition button if available

  - by steff

  Hi evereyone, I'd like to create a custom component which supports voice recognition. It will primarily be an extended EditText which should show the microphone button for voice recognition if it is available. I wanted to to look at the search app-widget on the homescreen but I don't find it in the source. This is intended to use the voice recognition as some sort of dictation device, i.e. the user does not have to type but use his voice instead. So could anyone please point me in some direction? Thanks in advance, Steff

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• SQL Loop over a family tree

  - by simon831

  Using SQL server 2008. I have a family tree of animals stored in a table, and want to give some information on how 'genetically diverse' (or not) the offspring is. In SQL how can I produce sensible metrics to show how closely related the parents are? Perhaps some sort of percentage of shared blood, or a number of generations to go back before there is a shared ancestor? AnimalTable Id Name mumId dadId select * from AnimalTable child inner join AnimalTable mum on child.[mumId] = mum.[Id] inner join AnimalTable dad on child.[dadId] = dad.[Id] inner join AnimalTable mums_mum on mum.[mumId] = mums_mum.[Id] inner join AnimalTable mums_dad on mum.[dadId] = mums_dad.[Id] inner join AnimalTable dads_mum on dad.[mumId] = dads_mum.[Id] inner join AnimalTable dads_dad on dad.[dadId] = dads_dad.[Id]

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• Suggestion for chkstk.asm stackoverflow exception in C++ with Visual Studio 2010

  - by Gulshan

  I am working with an implementation of merge sort. I am doing C++ Visual Studio 2010. But when I took a array of 300000 integers for timing, it is showing an unhandled stackoverflow exception and taking me to a readonly file named "chkstk.asm". I reduced the size to 200000 and it worked. Again the same code worked with C-free 4 editor (mingw 2.95) without any problem while the size was 400000. Do you have any suggestion to get the code working in Visual Studio? May be the recursion in the mergesort is causing the problem.

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• MyClass cannot be cast to java.lang.Comparable: java.lang.ClassCastException

  - by user2234225

  I am doing a java project and I got this problem and don't know how to fix it. The classes in my project (simplified): public class Item { private String itemID; private Integer price; public Integer getPrice() { return this.price; } } public class Store { private String storeID; private String address; } public class Stock { private Item item; private Store store; private Integer itemCount; public Integer getInventoryValue() { return this.item.getPrice() * this.itemCount; } } Then I try to sort an ArrayList of Stock so I create another class called CompareByValue public class CompareByValue implements Comparator<Stock> { @Override public int compare(Stock stock1, Stock stock2) { return (stock1.getInventoryValue() - stock2.getInventoryValue()); } } When I try to run the program, it gives the error: Exception in thread "main" java.lang.ClassCastException: Stock cannot be cast to java.lang.Comparable Anyone know what's wrong?

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• amCharts issue with Flex

  - by Conor Higgins

  HI I am working with amCharts at the moment and was wondering if somebody could give me some sort of guidance on the matter. I am using Flex to call a server side php file which then returns some xml data. This works perfectly and efficiently. I then add this data to the chart will also works quite well. However as I try to use the scroll bar on the chart, it seems to zoom out and delete all my data. I cant figure this out at all. The same thing happens when i click the show all button.

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• Creating GUI using XML file in C#

  - by Gal Goldman

  How can I create automatic GUI using XML file in C#? Should I write a parser for the file and define a sort of "protocol" for the file's structure, and after the parse - create the GUI controls manually (respective to the data in the files)? Or is there a better way? Is there a tool, or a built-in code in the .NET environment which can do that for me automatically? (I am currently working with win forms, but I am willing to consider any other technology - as long as it's supported in MONO, since the code should be portable to Linux as well).

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• rails accessing value from facebooker hash/array

  - by Ben

  This is my first time using the facebooker plugin with rails, and I'm having trouble accessing user info. The website uses FB connect to authenticate users. I am trying to get the name of the university that the logged in user attends. When I use the command <%= facebook_session.user.education_history[:name] %>, I get an error "Symbol as array index". I have also tried using education_history[1], but that just returns "# Facebooker::EducationInfo:<some sort of alphanumeric hash value>" When I use something like <%= facebook_session.user.relationship_status %> , it returns the relationship status just fine. Similarly, <%= facebook_session.user.hometown_location.city %> returns the city name just fine. I've checked out the documentation for facebooker, but I can't figure out the correct way to get the values I need. Any idea on how to get this to work? Thanks!

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• .Net friendly, local, key-value pair, replicatable datastore

  - by Brad Mathews

  I am looking for a key/value type datastore with very specific requirements. Anyone know anything that will work? Needs to be a component of some sort. No additional installation needed. The datastore needs to be on the local hard drive. I am using VB.Net for a desktop app running Windows XP through 7 so it needs to callable by that environment. It needs to replicatable. If I have four copies of my app running on the network, each local copy of the datastore needs to replicate with the others. As close to real time as possible. The first three are easy, I can do that with ADO.Net out of the box. The last one, replication, is the one I do not have answer to. Does such an animal exist? Thanks, Brad

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• Creating Graphs on an iPad/iPhone

  - by phantomdata

  I was wondering if anyone knew of a simple way to implement graphing in an iPhone/iPad application. I've spent quite a bit of time googling and can't seem to find any sort of a solution. Maybe I'm just searching with the wrong terms since a lot of consumers are asking about "graphing" in terms of using their applications, not developing them, the search-space is rather polluted. It seems like a lot of iPad/iPhone applications have embedded graphs... and I can't imagine that every developer has invented their own graphing engine from the ground up. Or, maybe they have... Does anyone have any suggestions?

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• ASP.NET MVC 3 - What features do you want to see?

  - by user299592

  I know a bunch of people that are really enjoying the improvements that ASP.NET MVC 2 made over the first release. I have just started to migrate our MVC 1 project over and so far areas has totally cleaned up the subfolder mess we had in our large scale application. As I dive deeper into all the improvements and changes that were made I still keep thinking to myself man it would be nice if they had x in this release. For isntance, I would love it if they had some sort of dependency injection built in instead of having to use third party solutions. My real question is now that ASP.NET MVC 2 is out in the wild, what features do want/wish the team had implemented and hope they will implement for ASP.NET MVC 3?

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• Having C# application communicate with Nagios

  - by user200295

  We are using Nagios to monitor our network with great results. There is now a new requirement we are struggling with: We want to notify Nagios of an non fatal but critical application errors. The application does not stop running but there is some sort of issue that needs looking into. Once the issue has been looked into, we need some way to "unflag" the issue in Nagios. We tried using the syslog, but the biggest problem was once an error was logged, the service was put into an error state with no way to recover. Also, while applications would report a critical error to the syslog, most of the time they don't report an "All clear" error.

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• Calculating Percentiles (Ruby).

  - by zxcvbnm

  My code is based on the methods described here and here. def fraction?(number) number - number.truncate end def percentile(param_array, percentage) another_array = param_array.to_a.sort r = percentage.to_f * (param_array.size.to_f - 1) + 1 if r <= 1 then return another_array[0] elsif r >= another_array.size then return another_array[another_array.size - 1] end ir = r.truncate another_array[ir] + fraction?((another_array[ir].to_f - another_array[ir - 1].to_f).abs) end Example usage: test_array = [95.1772, 95.1567, 95.1937, 95.1959, 95.1442, 95.061, 95.1591, 95.1195, 95.1065, 95.0925, 95.199, 95.1682] test_values = [0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0] test_values.each do |value| puts value.to_s + ": " + percentile(test_array, value).to_s end Output: 0.0: 95.061 0.1: 95.1205 0.2: 95.1325 0.3: 95.1689 0.4: 95.1692 0.5: 95.1615 0.6: 95.1773 0.7: 95.1862 0.8: 95.2102 0.9: 95.1981 1.0: 95.199 The problem here is that the 80th percentile is higher than the 90th and the 100th. However, as far as I can tell my implementation is as described, and it returns the right answer for the example given (0.9). Is there an error in my code I'm not seeing? Or is there a better way to do this?

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• Explain to me how the Method Profiler works in the DDMS, I get heap space error

  - by Pentium10

  I start the Method Profiler for a process, then leave it run for about 5-10 secs, then I stop it. I see a progress that a file is pulled from the sdcard, than I get this Exception [2010-05-23 18:45:42] Traceview: Exception in thread "main" java.lang.OutOfMemoryError: Java heap space [2010-05-23 18:45:42] Traceview: at java.util.Arrays.copyOf(Unknown Source) [2010-05-23 18:45:42] Traceview: at java.util.Arrays.copyOf(Unknown Source) [2010-05-23 18:45:42] Traceview: at java.util.ArrayList.toArray(Unknown Source) [2010-05-23 18:45:42] Traceview: at java.util.Collections.sort(Unknown Source) [2010-05-23 18:45:42] Traceview: at com.android.traceview.TimeLineView.setData(TimeLineView.java:370) [2010-05-23 18:45:42] Traceview: at com.android.traceview.TimeLineView.<init>(TimeLineView.java:316) [2010-05-23 18:45:42] Traceview: at com.android.traceview.MainWindow.createContents(MainWindow.java:95) [2010-05-23 18:45:42] Traceview: at org.eclipse.jface.window.Window.create(Window.java:431) [2010-05-23 18:45:42] Traceview: at org.eclipse.jface.window.Window.open(Window.java:790) [2010-05-23 18:45:42] Traceview: at com.android.traceview.MainWindow.run(MainWindow.java:60) [2010-05-23 18:45:42] Traceview: at com.android.traceview.MainWindow.main(MainWindow.java:224) What I am doing wrong?

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• Connect sortable lists together and update SQL using jQuery UI

  - by rebellion

  I'm using jQuery UI's sortable lists to sort items in a todo list, and the reordering of the lists works like a charm. I have several UL lists for each todo category, i.e. Design, Development, etc. I want to be able to move an item from one category to another, and jQuery UI's sortable lists plugin allows me to do this with the connectWith option parameter. But I can't seem to find how to update the database as well. The todo database table has a field for a reference to the category which is laying in it's own table. This is the current code: $('.sortable').sortable({ axis: 'y', opacity: .5, cancel: '.no-tasks', connectWith: '.sortable', update: function(){ $.ajax({ type: 'POST', url: basepath + 'task/sort_list', data: $(this).sortable('serialize') }); } }); Do I need to add another value to the AJAX's data parameter, or do the sortable plugin this for me in the serialize function?

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• Detect WebKit Version 525 and Below With RegEx

  - by Jay

  I'm no good at Regular Expressions, really! I would like to specifically detect WebKit browsers below version 525. I have a regular expression [/WebKit\/[\d.]+/.exec(navigator.appVersion)] that correctly returns WebKit/5….…, really, I'd like it to return only the version number, but if the browser isn't WebKit, return null, or better still 0. For example, if the browser was Trident, Presto or Gecko, return null, whereas if the browser is WebKit, return it's version number. To clarify, I would like the regular expression to check if navigator.appVersion contains WebKit and if it does not, return null, if it does, return the version number. I appreciate all your help! Please let's keep this focused, let's not flirt with jQuery or the sort, it's overkill in this scenario.

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• MooTools Sortables with horizontal list having problems

  - by Anurag

  I am having problems sorting list items using the Sortables class when the list items are displayed horizontally. Removing this style fixed everything: display: inline Created an example on jsfiddle. This works. Check the stylesheet for .countries li - it does not display the list inline - http://jsfiddle.net/Wgpqw/ This does not work properly. I can drag the list items around the list, but the sort randomly happens when moving around - http://jsfiddle.net/Wgpqw/1/ I suspect it has something to do with the list element positioning in inline mode. Any help is greatly appreciated.

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• Are there clean ways to do these Quartz Triggers?

  - by Ryan Elkins

  I'm using Quartz to schedule some jobs but I have a few scenarios that I'm not sure how to resolve. 1) Lets say I have a job that is scheduled to run every 5 minutes. Generally that works well but periodically the job takes more than 5 minutes and I don't really want multiple instances of the job running simultaneously. 2) I have a job that can take between 1 and 60 minutes to complete. I want it to run continuously but pause for 10 minutes between runs, regardless of how long it took previously. I like using Quartz for this rather than some sort of loop because if a job crashes Quartz will still spin up a new one based on the schedule. I am using Quartz in Java right now.

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• core data editor problems

  - by Peyman

  I was recommended by someone in Stack Overflow to use Core Data Editor http://christian-kienle.de/CoreDataEditor/ to manage the sqlite persistent store. However the latest version (3.0) crashes on launch everytime. Older versions load but I see nothing when i point the config to the persistent store and the object model directories. There is no documentation either. can someone point me to the right place to sort this problem? I am trying to find a more manageable way to coordinate core data development than sqlite consoles. thank you

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• removing duplicate strings from a massive array in java efficiently?

  - by Preator Darmatheon

  I'm considering the best possible way to remove duplicates from an (Unsorted) array of strings - the array contains millions or tens of millions of stringz..The array is already prepopulated so the optimization goal is only on removing dups and not preventing dups from initially populating!! I was thinking along the lines of doing a sort and then binary search to get a log(n) search instead of n (linear) search. This would give me nlogn + n searches which althout is better than an unsorted (n^2) search = but this still seems slow. (Was also considering along the lines of hashing but not sure about the throughput) Please help! Looking for an efficient solution that addresses both speed and memory since there are millions of strings involved without using Collections API!

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• Not sure whether to use haXe of just plain flash

  - by tominated

  Hi Guys, A local sports clothing company has hired me to make them a flash based jersey colour picker sort of thing. They are wanting it so users can check out what particular designs would look like with certain colours. Now, I'm by no means a great developer (I'm 16, but I know my way around javascript, flash and a bit of AS2) but I've taken notice of haXe recently and think it might be a good project to write in it and compile to a swf. I'm not sure if I should just use flash, or if I should use haXe. Is anybody able to iterate on the strengths and weaknesses of using haXe or flash please? Thanks in advance! P.S. I do have a copy of flash (supplied by school), so that doesn't concern me.

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• Sorting nested hash in ruby

  - by Rabbott

  Provided the following ruby hash: { cat: { 1: 2, 2: 10, 3: 11, 4: 1 }, wings: { 1: 3, 2: 5, 3: 7, 4: 7 }, grimace: { 1: 4, 2: 5, 3: 5, 4: 1 }, stubborn: { 1: 5, 2: 3, 3: 7, 4: 5 } } How can I sort the hash by the sum of 'leaf' excluding "4", for instance the value to compare for "cat" would be (2 + 10 + 11) = 23, the value for "wings" would be (3 + 5 + 7) = 15 so if I was comparing just those two they would be in the correct order, highest sum on top. It is safe to assume that it will ALWAYS be {1: value, 2: value, 3: value, 4: value} as those are keys for constants I have defined. It is also safe to assume that I will only ever want to exclude the key "4", and always use the keys "1", "2", and "3"

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• What are the Worst Software Project Failures Ever?

  - by Warren P

  Is there a good list of "worst software project failures ever" in the history of software development? For example in Canada a "gun registry" project spent around two billion dollars. (http://en.wikipedia.org/wiki/Gun_registry). This is of course, insane, even if the final product "sort of worked". I have heard of an FBI Case file system which there have been several attempts to rewrite, all of them so far, failures. There is a book on the subject (Software Runaways). There doesn't seem to be be a software "boondoggle" list or "fiasco" list on Wikipedia that I can see. (Update: Therac-25 would be the 'winner' of this question, except that I was internally thinking more of Software projects that had as their deliverable, mainly software, as opposed to firmware projects like Therac-25, where the hardware and firmware together are capable of killing people. In terms of pure software monetary debacles, which was my intended question, there are several contenders.)

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• Regular Expressions: RegEx for determining valid PHP class property names?

  - by Brian Lacy

  I am using PHP's magic __set and __get methods to access a private array in a class. I want to make sure the property names requested (i.e. $myObj->FakeProperty) are valid according to PHP property name rules before accessing them. My current RegEx isn't doing the trick; with my test values, _12 always falls through the cracks. I'm not actually sure that my test values even represent a realistic representation of what is and isn't allowed for PHP class property names, but I'm not really too concerned about it, just that I have some sort of rudimentary check in place. Test Fields: albert12 12Albert _12 _Albert12 _12Albert _____a_1 RegEx: ^(?=_*[A-z]+)[A-z0-9_]+$

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• how do arguments work with dojo.connect?

  - by sprugman

  I've read the docs, but I must be missing something. I've got a grid, I want to connect to the event that fires when the column headers are clicked for sorting, thus: dojo.addOnLoad(function(){ var grid = dijit.byId("grid"); dojo.connect(grid, "setSortInfo", 'afterSort'); }); function afterSort() { console.info('after sort'); } That works fine as far as it goes. I know the setSortInfo method has an argument which is the column number. How do I get that value? I've tried putting a parameter in the sig for afterSort to no avail. The docs say "the method receives the same arguments as the event", but where are they???

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