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• Is it possible to use the Raring install image as a package repo (like the old alternate CD)?

  - by jamadagni

  I use Kubuntu and recently upgraded to Raring directly from Precise. Until Precise, I always installed the OS using the alternate CD and not the desktop CD, because I could later on mount the image and use it as an offline package repo. For instance if I remove a package installed by the default installer and later I want to install it again, I can just install it from the ISO without needing to download it again. However, since Quantal the alternate CD no longer exists, so I am not sure how to set up the installed image as a local repo. I mean, doing find . -name "*.deb" inside the ISO tree after loopmounting it only shows a few packages like libc6 gcc and such and not the full set of packages that are actually installed -- I presume they are included in pre-installed form inside casper/filesystem.squashfs. Given this situation, is it or is it not possible to use the Raring install images as offline repos? If yes, how? Thank you!

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• No partitions in Ubuntu isntallation

  - by user204212

  Today, with the new version of Ubuntu, I have decided to install it in my laptot, but running with Windows 8, which is the OS I have installed now and that I don't want to uninstall, because I need some programs. I have downloaded it and burned into a CD. Everything in the "installation" goes right untill I have to choose where to install it. It doesn't recognise my Windows 8 and, moreover, it sees my disk as it was all empty space (500Gb). I can't install it and I don't know what to do, so let's see if you can help, because you know a lot more than me in this topic :) Thanks!

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• How to boot WUBI installed Ubuntu within Windows 8?

  - by benzodm

  I have Windows 8 Release Customer Preview on my laptop. I tried to install Ubuntu on it with Ubuntu Windows installer (I have always used this to install, although that was on Windows 7), it installs and asks to reboot, then immediately Windows 8 boots up. I do not have the option to choose what OS to boot. How can I boot to Ubuntu? VM is not exactly what I would like to use, but it is an option, however a last resort. Any help?

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• Primavera P6 Cloud ??!P6 R8.3.2????!

  - by hhata

  ????Primavera P6 Enterprise Project Portfolio Management (EPPM) ????? 8.3.2???????????????????????????(SaaS)????????P6????????????????????SaaS???????????????????????P6??????????????????????????·???????????????????????????TCO(Total Cost of Ownership)???????????????OS?????????????????????Primavera?????????P6??????????????????? ??????PPM????????????????????????????? [????] ??????????????????????????????????????????????? [???] TCO????????????PPM????????????????????????????? [??] ?????????????????????????????????????????? [????] HW????????????????P6???????????????????????????? Primavera P6 ????????????????????????: Primavera P6 EPPM Primavera P6 Professional Primavera EPPM Web Services Primavera P6 Team Member Primavera Team Member for iPhone and iPad Primavera P6 Email Statusing Primavera P6 Progress Reporter Document Management BI Publisher WebLogic Application Server P6 Cloud Connect Primavera P6 Professional ????????????????????????????????P6??????????????P6 Cloud Connect???P6??????????????????P6????????????? ???iPad?iPhone???????Team Member?????????????????P6 Cloud??????????????????????????????????P6 Cloud?????Primavera Unifier??????????????????????? P6 Cloud?????????1???????1???????????????????????????????(????)???????????? ????????????Primavera ????????Primavera ????·?????????:??(03-6834-5241/[email protected])?????????????

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• ???10.2???+ASM???11.2???+ASM(Oracle Restart)

  - by JaneZhang(???)

      ?????????????10.2.0.5?????ASM??????????11.2.0.2???ASM???????(??Oracle Restart).    OS: Linux 5.3    ????:    1.???10.2????????11.2.0.2?OUI,?????“"Upgrade Oracle Grid Infrastructure of Oracle Automatic Storage Management”?????ASM???????,???????????   2. ?11.2.0.2 ????????????ORACLE_HOME?   3. ??DBUA?10.2.0.5???????11.2.0.2.    ?????????:How_to_Upgrade_10.2_Single_ASM_To_11.2_Single_ASM.pdf

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• ????JavaFX??Java???????·?????????????????Java Developer Workshop #2?????|WebLogic Channel|??????

  - by ???02

  WebLogic Server?????????Java???????????????????WebLogic Channel?????????JavaOne 2011??Java/Java EE????????!――???????????????!!?????????????????????JavaOne 2011????????????????????????????????????JavaFX?????2011?12?1?????????????Java?????????????Java Developer Workshop #2????JavaOne 2011?JavaFX???????????????Oracle Corporation?JavaFX??????Nandini Ramani?(Client Java Group???????????)??????JavaFX 2.0-Next generation Java client solution????????????????????JavaFX?????????????????????(???)?Pure Java???????UI??????JavaFX 2.0??JavaOne 2011??Java/Java EE????????!???????????API????Java????????????1?????????Ramani?????????JavaFX????????JavaFX 2.0??????????????????????　???JavaFX 2.0?????????????????????????????????JavaFX Script??????????????????Java?????????????·???????????????????????Java?????????????????????????????　??????????????PC????????????·??????????????????????????????????????API???????????????????·?????????????????????????????????????????????900????????????Java???????????JavaFX??????????????????????????????·???????(UI)????????????????????(Ramani?)　Ramani??????JavaFX 2.0??????/???????????100% Java API?Swing????FXML???UI????????WebKit???Web????????????????????????????　??????FXML(FX Markup Language)???JavaFX?UI????????XML????????????????Ramani????????????????????????????????·?????????????UI????????????????????????JavaScript?Groovy?Scala???JVM????????????????????????　???JavaFX 2.0????????(JavaFX Runtime)???????????????????????AWT????????????????OS???????????????Glass Windowing Toolkit??2D/3D????????·???????GPU???????????Prism????????????????　?????Prism????????????????·??????????3D?????????????????????????????????????????????·????????60fps??HD??????????VP6?MP3?????????????????????????????????????·??????????????　?????????????????????????JavaFX 2.0???????Ramani???????????????????·????????????·???????????????????????????????JavaFX 2.0?????????????·?????????????????????????????????????Prism???????????????????????????????????????????????????????????????????????JavaFX??????????·??????????????????????????????????????????????/???????????(?????????)????????????????????　??????????????????NetBeans IDE 7.0?????Eclipse?JDeveloper???????IDE?????????????????????????????&??????????????UI???????JavaFX Scene Builder????????　?????JavaFX 2.0???????????·???????????????3D????????????·????????????????????????????????????Ramani????JavaFX Labs????????????JavaFX 2.0????????????????????????????3D???????????????????????????????UI?????????????????????????????????????3D???·?????????????????　???JavaFX 2.0?????????????3D?????????·??????·??????????????????????·?????·?????Kinect?????????????????????·?????????????????????·?????·????Kinect????3D??????????????????????????????　????JavaFX????????????????????????JavaFX????????·?????????Linux?????????PC?iPad????????????????????　?????????2???????????JavaFX??Java??????????????????GUI?????????????????????????????JavaFX??????????????????????Ramani???????????　?JavaFX???????????????????????????????·??????????????????Swing?AWT???????????????·?????????????????????????????????????　???JavaFX???????????·???????OpenJFX?????OpenJDK????????????????????????????UI??????????????????Ramani??????????????????????????????????????????????Java???????????????????JavaFX???????????????????????????????????????????:?Java Developer Workshop #2?????Nandini Ramani?????????????????????

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• Using parameters in reports for VIsual Studio 2008

  - by Jim Thomas

  This is my first attempt to create a Visual Studio 2008 report using parameters. I have created the dataset and the report. If I run it with a hard-coded filter on a column the report runs fine. When I change the filter to '?' I keep getting this error: No overload for method 'Fill' takes '1' argument Obviously I am missing some way to connect the parameter on the dataset to a report parameter. I have defined a report parameter using the Report/Report Parameter screen. But how does that report parameter get tied to the dataset table parameter? Is there a special naming convention for the parameter? I have Googled this a half dozen times and read the msdn documentation but the examples all seem to use a different approach (like creating a SQL query rather then a table based dataset) or entering the parameter name as "=Parameters!name.value" but I can't figure out where to do that. One msdn example suggestted I needed to create some C# code using a SetParameters() method to make the connection. Is that how it is done? If anyone can recommend a good walk-through I'd appreciate it. Edit: After more reading it appears I don't need report parameters at all. I am simply trying to add a parameter to the database query. So I would create a text box on the form, get the user's input, then apply that parameter programmatically to the fill() argument list. The report parameter on the other hand is an ad-hoc value generally entered by a user that you want to appear on the report. But there is no relationship between report parameters and query/dataset parameters. Is that correct?

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• WPF: How to set column width with auto fill in ListView with custom user control.

  - by powerk

  A ListView with Datatemplate in GridViewColumn: <ListView Name ="LogDataList" IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding LogDataCollection}" Background="Cyan"> <ListView.View> <GridView AllowsColumnReorder="true" ColumnHeaderToolTip="Event Log Information"> <GridViewColumn Header="Event Log Name" Width="100"> <GridViewColumn.CellTemplate> <DataTemplate> <l:MyTextBlock Height="25" DataContext="{Binding LogName, Converter={StaticResource DataFieldConverter}}" HighlightMatchCase="{Binding Element}" Loaded="EditBox_Loaded"/> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> ... </GridView> </ListView.View> </ListView> I have no idea about how to make column width autofill although I have tried a lot of way to walk up. The general idea for demo is : <ListView Name ="LogDataList" IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding LogDataCollection}" Background="Cyan"> <ListView.Resources> <Style x:Key="ColumnWidthStyle" TargetType="{x:Null GridViewColumn}"> <Style.Setters> <Setter Property="HorizontalContentAlignment" Value="Stretch" > </Setter> </Style.Setters> </Style> </ListView.Resources> <ListView.View> <GridView AllowsColumnReorder="true" ColumnHeaderToolTip="Event Log Information"> <GridViewColumn Header="Event Log Name" DisplayMemberBinding="{Binding Path=LogName}" HeaderContainerStyle="{StaticResource ColumnWidthStyle}"> It works, but not accord with my demand. I need to customize datatemplate with my custom user control(MyTextBlock) since the enhancement(HighlighMatchCase property) and binding datacontext. How can I set up ColumnWidthMode with Fill in the word? On-line'in. I really appreciate your help.

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• Empty responseText from XMLHttpRequest

  - by PurplePilot

  I have written an XMLHttpRequest which runs fine but returns an empty responseText. The javascript is as follows: var anUrl = "http://api.xxx.com/rates/csv/rates.txt"; var myRequest = new XMLHttpRequest(); callAjax(anUrl); function callAjax(url) { myRequest.open("GET", url, true); myRequest.onreadystatechange = responseAjax; myRequest.setRequestHeader("Cache-Control", "no-cache"); myRequest.send(null); } function responseAjax() { if(myRequest.readyState == 4) { if(myRequest.status == 200) { result = myRequest.responseText; alert(result); alert("we made it"); } else { alert( " An error has occurred: " + myRequest.statusText); } } } The code runs fine. I can walk through and I get the readyState == 4 and a status == 200 but the responseText is always blank. I am getting a log error (in Safari debug) of Error dispatching: getProperties which I cannot seem to find reference to. I have run the code in Safari and Firefox both locally and on a remote server. The URL when put into a browser will return the string and give a status code of 200. I wrote similar code to the same URL in a Mac Widget which runs fine, but the same code in a browser never returns a result.

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• ASP.net DAL DatasSet and Table Adapter not in namespace - Northwind Tutorial

  - by Alan

  I've been attempting to walk through the "Creating a Data Access Layer" tutorial found http://www.asp.net/learn/data-access/tutorial-01-cs.aspx I create the DB connection, create the typed dataset and table adapter, specify the sql, etc. When I add the code to the presentation layer (in this case a page called AllProducts.aspx) I am unable to find the NorthwindTableAdapters.ProductsTableAdapter class. I tried to import the NorthwindTableAdapters namespace, but it is not showing up. Looking in the solution explorer Class View confirms that there is a Northwind class, but not the namespace I'm looking for. I've tried several online tutorials that all have essentially the same steps, and I'm getting the same results. Can anyone give me a push in the right direction? I'm getting error: Namespace or type specified in the Imports 'NorthwindTableAdapters' doesn't contain any public member or cannot be found. Make sure the namespace or the type is defined and contains at least one public member. I think I might need to add a reference OR they may be creating a separate class and importing it into their main project. If that's the case, the tutorials do not mention this. SuppliersTest2.aspx.vb: Imports NorthwindTableAdapters Partial Class SuppliersTest2 Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Dim suppliersAdapter As New SuppliersTableAdapter GridView1.DataSource = suppliersAdapter.GetAllSuppliers() GridView1.DataBind() End Sub End Class

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• Notification Email Best Practices--From Server Setup to Programming

  - by Andrew Wagner

  All, I'm in the process now of building a SaaS tool that allows network admins to generate notification emails to the members of the end-users of our platform (among many many other things). I'm running into a bit of an "out of my expertise" wall, as I know there are a lot of variables involved with configuring an application that can: Run in a distributed way via load balancing and still-- Leverage a single mail server for sending notification emails Process unsubscribe requests Avoid any ISP blacklisting in the process. If anyone has the time and has done this before, I'd love if you could walk me through the A-Z of best practices both from a configuration perspective and an execution perspective for generating these emails (anything from necessary DNS settings to ideal SMTP setup and configuration) Currently, our application generates email via Google Apps using the PHPMailer class. While this works well, it doesn't queue messages (potential for timeout problems if any of our clients amass a very large list of end-users), and Google limits the amount of allowed generated email messages to 500/day. I know this is a lofty question, but any guidance you could provide would be smashing and a big help as we work through this hurtle in our beta development stage. Thanks!

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• Determining the maximum stack depth

  - by Joa Ebert

  Imagine I have a stack-based toy language that comes with the operations Push, Pop, Jump and If. I have a program and its input is the toy language. For instance I get the sequence Push 1 Push 1 Pop Pop In that case the maximum stack would be 2. A more complicated example would use branches. Push 1 Push true If .success Pop Jump .continue .success: Push 1 Push 1 Pop Pop Pop .continue: In this case the maximum stack would be 3. However it is not possible to get the maximum stack by walking top to bottom as shown in this case since it would result in a stack-underflow error actually. CFGs to the rescue you can build a graph and walk every possible path of the basic blocks you have. However since the number of paths can grow quickly for n vertices you get (n-1)! possible paths. My current approach is to simplify the graph as much as possible and to have less possible paths. This works but I would consider it ugly. Is there a better (read: faster) way to attack this problem? I am fine if the algorithm produces a stack depth that is not optimal. If the correct stack size is m then my only constraint is that the result n is n = m. Is there maybe a greedy algorithm available that would produce a good result here?

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• Why is software quality so problematic?

  - by Yuval A

  Even when viewing the subject in the most objective way possible, it is clear that software, as a product, generally suffers from low quality. Take for example a house built from scratch. Usually, the house will function as it is supposed to. It will stand for many years to come, the roof will support heavy weather conditions, the doors and the windows will do their job, the foundations will not collapse even when the house is fully populated. Sure, minor problemsdo occur, like a leaking faucet or a bad paint job, but these are not critical. Software, on the other hand is much more susceptible to suffer from bad quality: unexpected crashes, erroneous behavior, miscellaneous bugs, etc. Sure, there are many software projects and products which show high quality and are very reliable. But lots of software products do not fall in this category. Take into consideration paradigms like TDD which its popularity is on the rise in the past few years. Why is this? Why do people have to fear that their software will not work or crash? (Do you walk into a house fearing its foundations will collapse?) Why is software - subjectively - so full of bugs? Possible reasons: Modern software engineering exists for only a few decades, a small time period compared to other forms of engineering/production. Software is very complicated with layers upon layers of complexity, integrating them all is not trivial. Software development is relatively easy to start with, anyone can write a simple program on his PC, which leads to amateur software leaking into the market. Tight budgets and timeframes do not allow complete and high quality development and extensive testing. How do you explain this issue, and do you see software quality advancing in the near future?

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• docs/examples on libxml2 type system?

  - by Wang

  I'm reading through the libxml2 API and examples on xmlsoft.com and having some real difficulty wrapping my head around the type system. For example, the _xmlAttribute struct has an xmlChar* field called name. This obviously refers to the name of the attribute (e.g., "bar" for the struct tied to the element <foo bar='baz' />). The _xmlAttribute struct also has a field called value, which I would expect to be "baz", except the type is xmlNodePtr. Um, what? I guess I could write up some test code and examine the memory in gdb, but there has to be an easier way. Has anyone written up examples of the data structures generated by a libxml2 parser? I'm looking for an English prose text, not generated documentation, that will walk me through the various types and the values they take when parsing some example bit of XML. Bonus points if it presents only the subset of libxml2 needed to read and write a config file---no namespaces or XPath or even modifying an existing document, just parse some XML, access the data, and then write it out again.

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• Storing a digital signature for bookings on a web based system

  - by Duncan

  I have a web based bookings system built for a UK higher education client to allow students to sign out equipment (laptops, camera's etc). It's been in use successfully for a couple of years, in the current workflow equipment is collected and the booking is printed, signed by the student and kept until the equipment is returned. They are emailed a pdf copy of the booking and reminders if equipment is outstanding. Students can login and prebook equipment using their university LDAP credentials, the booking is then authorised by staff for later collection, but can also walk in and have equipment booked out by staff. They would like to remove the signed paper part of the process and replace this with some sort of digital signature. The suggestion was a graphics tablet but with a web based system this would require a local software package and in my view be impractical. My thought is that students would enter their LDAP username and password upon collection of the equipment, verifying their identity and effectively digitally signing the booking. My question is what would be best to store as a signature or whether to simply authenticate the user and use a boolean flag to indicate that this has been done could be deemed sufficient?

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• What tools/techniques can benefit a solo developer?

  - by Michael Runyon

  Hello, I am a solo developer, working in a very small web development firm. There is occasional support for development from contractors, but for the most part, if code is written in the office, I am writing it. Many of the articles and such on here talk extensively about the tools and techniques used for collaboration of developers in teams, but that is a non-issue with me, as there is no one to (technically) collaborate with. Yet, I feel that in many ways, there are things that could be adjusted for efficiency. Our small office doesn't participate in many of the meetings/team constructions that most of the techniques rely heavily upon....we mostly just walk around and talk to one another when something is needed. This works great for all of the Just-In-Time, 15 minute fix stuff that probably populates 50% of my day, but I am also constantly working on major projects that require my total concentration, and between a flurry of tiny fixes, and being the primary admin on the 4-6 servers that we own, I find it almost impossible to get real, heavy lifting done. What suggestions can you some of you offer to help me/us become more productive/efficient, without adopting all of the corporate/teamwork practices that we are trying desperately to avoid? At what cost for efficiency is our total relaxation?

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• Command-Line Parsing API from TestAPI library - Type-Safe Commands how to

  - by MicMit

  Library at http://testapi.codeplex.com/ Excerpt of usage from http://blogs.msdn.com/ivo_manolov/archive/2008/12/17/9230331.aspx A third common approach is forming strongly-typed commands from the command-line parameters. This is common for cases when the command-line looks as follows: some-exe COMMAND parameters-to-the-command The parsing in this case is a little bit more involved: Create one class for every supported command, which derives from the Command abstract base class and implements an expected Execute method. Pass an expected command along with the command-line arguments to CommandLineParser.ParseCommand – the method will return a strongly-typed Command instance that can be Execute()-d. // EXAMPLE #3: // Sample for parsing the following command-line: // Test.exe run /runId=10 /verbose // In this particular case we have an actual command on the command-line (“run”), which we want to effectively de-serialize and execute. public class RunCommand : Command { bool? Verbose { get; set; } int? RunId { get; set; } public override void Execute() { // Implement your "run" execution logic here. } } Command c = new RunCommand(); CommandLineParser.ParseArguments(c, args); c.Execute(); ============================ I don't get if we instantiate specific class before parsing arguments , what's the point of command line argument "run" which is very first one. I thought the idea was to instantiate and execute command/class based on a command line parameter ( "run" parameter becomes instance RunCommand class, "walk" becomes WalkCommand class and so on ). Can it be done with the latest version ?

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• When do married programmers find time to work?

  - by dave-keiture

  Hi people, Maybe my problem is unique (though I don't believe so), and probably I should go with it to the psychologist, but sinse I get married (~year ago) I feel that I don't have enough time to work anymore. For years I've been working at my day job doing regular stuff, and at nights I've been committing to the opensource projects, freelancing and self-educating. Now, I can't work at home at all, because once I start working, my wife either says that there're more important thing to do (walk out the dog, buy something in a grocery, etc.) or that I don't pay anough attention to her.. As a workaround, I've started getting up at 3-4AM in the morning to do the things I was usually doing nightly before. After a month of such schedule I feel myself totally crushed. So... 2 questions: Do you have the same problems, or I'm just a <..., who should say goodbye to programming, and start doing "really important things"? If you have the same problems, when do you find time to work? Maybe you know any cool lifehack or trick to spend at least some tome for doing the thing you like :) Best regards.

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• WPF UI Automation - AutomationElement.FindFirst fails when there are lots of elements

  - by Orion Edwards

  We've got some automated UI tests for our WPF app (.NET 4); these test use the UI Automation API's. We call AutomationElement.FindFirst to find a target element, and then interact with it. Example (pseudocode): var nameEquals = new PropertyCondition(AutomationElement.NameProperty, "OurAppWindow"); var appWindow = DesktopWindow.FindFirst(TreeScope.Children, nameEquals); // this succeeds var idEquals = new PropertyCondition(AutomationElement.AutomationIdProperty, "ControlId"); var someItem = appWindow.FindFirst(TreeScope.Descendants, idEquals); // this suceeds sometimes, and fails sometimes! The problem is, the appWindow.FindFirst will sometimes fail and return null, even when the element is present. I've written a helper function which walks the UI automation tree manually and prints it out, and the element with the correct ID is present in all cases. It seems to be related to how many other items are also being displayed in the window. If there are no other items then it always succeeds, but when there are many other complex UI elements being displayed alongside it, then the find fails. I can't find any documented element limit mentioned for any of the automation API's - is there some way around this? I'm thinking I might have to write my own implemententation of FindFirst which does the tree walk manually itself... As far as I can tell this should work, because my tree-printer utility function does exactly that, and it's ok, but it seems like this would be unnecessary and slow :-( Any help would be greatly appreciated

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• ClickOnce Deployment Error - Access to the Path is Denied

  - by michael.lukatchik

  I have a WPF app that I'm deploying to a network path using ClickOnce deployment. After the app is deployed to a network location, I use the ClickOnce html page to launch the installation process. I am successfully able to download and install the app. However, my users are not able to download and install the app. When a user navigates to the ClickOnce html page and clicks to begin the installation process, the following error message is received: ERROR SUMMARY Below is a summary of the errors, details of these errors are listed later in the log. * Activation of http://software.mycompany.com/myapp/myapp.application resulted in exception. Following failure messages were detected: + Downloading file://dev/webs/software/myapp/myapp.application did not succeed. * [4/5/2010 1:56:59 PM] System.Deployment.Application.DeploymentDownloadException (Unknown subtype) - Downloading file://dev/Webs/software/myapp/myapp.application did not succeed. All signs point to this being a security issue. So, I've done the following: Ensured that "Everyone" had read access to the files that were being deployed as part of my project Ensured that "Everyone" had read access to the network location where the app was deployed (//dev/webs/software/myapp) Ensured that "Everyone" had read access to the IIS path where the ClickOnce html page is located In each of these cases, I've made no progress in getting the app to successfully deploy via ClickOnce. Again, the odd thing is that I am able to successfully walk through the process of downloading and installing the app. It's my users, though, that need the ability to download and install the app. I've looked extensively on the web for answers, but there hasn't been much. I'd like to resolve the issue without "re-installing" or "rigging" anything. I need a solid answer. Thank you all for your input!! Mike

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• Webservices on iPhone - wsdl2objc - Sample Code?

  - by markmcgookin

  I have recently downloaded the most recent build of this awesome tool WSDL2OBJC from google code here: http://code.google.com/p/wsdl2objc/ After a bit of tweaking and downloading the latest version of the trunk from the svn repo I got a version that created the code for a WSDL I am using and compiles great and actually installs on my phone! However, I'm not doing anything with it yet, because I am not really sure how to. There is very little in the way of sample code on the site, and there is a sample file in the project if you download it, but again it is very complicated and there are no real bits of documentation. Has anyone managed to successfully use this stuff? It seems SOOO powerful and useful but from a look around the Internet, no one knows how to use it. We (all) would love someone who has figured it out to post a simple project or detailed walk-through of implementing this so we can put the code that lots of people have worked hard on to good use. If anyone has found a blog entry or has this information it would be great to see! I am totally stuck... with no errors. I would love to know how to use this now that it's all compiled successfully!

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• UX question: is better to have "serious delete" or have "trash"

  - by ftrotter

  I am developing an application that allows for a user to manage some individual data points. One of the things that my users will want to do is "delete" but what should that mean? For a web application is it better to present a user with the option to have serious delete or to use a "trash" system? Under "serious delete" (would love to know if there is a better name for this...) you click "delete" and then the user is warned "this is final and tragic action. Once you do this you will not be able to get -insert data point name here- back, even if you are crying..." Then if they click delete... well it truly is gone forever. Under the "trash" model, you never trust that the user really wants to delete... instead you remove the data point from the "main display" and put into a bucket called "the trash". This gets it out of the users way, which is what they usually want, but they can get it back if they make a mistake. Obviously this is the way most operating systems have gone. The advantages of "serious delete" are: Easy to implement Easy to explain to users The disadvantages of "serious delete" are: it can be tragically final sometimes, cats walk on keyboards The advantages of the "trash" system are: user is safe from themselves bulk methods like "delete a bunch at once" make more sense saves support headaches The disadvantages of the "trash" system are": For sensitive data, you create an illusion of destruction users think something is gone, but it is not. Lots of subtle distinctions make implementation more difficult Do you "eventually" delete the contents of the trash? My question is which one is the right design pattern for modern web applications? With enough discussion to justify your answer... Would love to be pointed towards some relevant research. -FT

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• For "draggable" div tags that are NOT nested: JQuery/JavaScript div tag “containment” approach/algor

  - by Pete Alvin

  Background: I've created an online circuit design application where .draggable() div tags are containers that contain smaller div containers and so forth. Question: For any particular div tag I need to quickly identify if it contains other div tags (that may in turn contain other div tags). -- Since the div tags are draggable, in the DOM they are NOT nested inside each other but I think are absolutely positioned. So I think that a "hit testing" approach is the only way to determine containment, unless there is some "secret" routine built-in somewhere that could help with this. I've searched JQuery and I don't see any built-in routine for this. Does anyone know of an algorithm that's quicker than O(n^2)? Seems like I have to walk the list of div tags in an outer loop (n) and have an inner loop (another n) to compare against all other div tags and do a "containment test" (position, width, height), building a list of contained div tags. That's n-squared. Then I have to build a list of all nested div tags by concatenating contained lists. So the total would be O(n^2)+n. There must be a better way?

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• Forcing CLLocationManager updates - does it help or hurt?

  - by Steve N

  I've been trying to find any way to optimize the performance of my location-based iPhone application and have seen some people mention that you can force location updates by starting and stopping your CLLocationManager. I need the best accuracy I can get, and the user in my case would probably like to see updates every few seconds (say, 10 seconds) as they walk around. I've set the filters accordingly, but I notice that sometimes I don't get any updates on the device for quite some time. I'm testing the following approach, which forces an update when a fixed time interval passes (I'm using 20 seconds). My gut tells me this really won't help me provide more accurate updates to the user, and that just leaving CLLocationManager running all the time is probably the best approach. - (void)forceLocationUpdate { [[LocationManager locationManager] stopUpdates]; [[LocationManager locationManager] startUpdates]; [self performSelector:@selector(forceLocationUpdate) withObject:nil afterDelay:20.0]; } My question is- does forcing updates from CLLocationManager actually improve core location performance? Does it hurt performance? If I'm outside in an open field with good GPS reception, will this help then? Does anyone have experience trying this? Thanks in advance, Steve

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• Figuring out the Nyquist performance limitation of an ADC on an example PIC microcontroller

  - by AKE

  I'm spec-ing the suitability of a dsPIC microcontroller for an analog-to-digital application. This would be preferable to using dedicated A/D chips and a separate dedicated DSP chip. To do that, I've had to run through some computations, pulling the relevant parameters from the datasheets. I'm not sure I've got it right -- would appreciate a check! (EDITED NOTE: The PIC10F220 in the example below was selected ONLY to walk through a simple example to check that I'm interpreting Tacq, Fosc, TAD, and divisor correctly in working through this sort of Nyquist analysis. The actual chips I'm considering for the design are the dsPIC33FJ128MC804 (with 16b A/D) or dsPIC30F3014 (with 12b A/D).) A simple example: PIC10F220 is the simplest possible PIC with an ADC Runs at clock speed of 8MHz. Has an instruction cycle of 0.5us (4 clock steps per instruction) So: Taking Tacq = 6.06 us (acquisition time for ADC, assume chip temp. = 50*C) [datasheet p34] Taking Fosc = 8MHz (? clock speed) Taking divisor = 4 (4 clock steps per CPU instruction) This gives TAD = 0.5us (TAD = 1/(Fosc/divisor) ) Conversion time is 13*TAD [datasheet p31] This gives conversion time 6.5us ADC duration is then 12.56 us [? Tacq + 13*TAD] Assuming at least 2 instructions for load/store: This is another 1 us [0.5 us per instruction] Which would give max sampling rate of 73.7 ksps (1/13.56) Supposing 8 more instructions for real-time processing: This is another 4 us Thus, total ADC/handling time = 17.56us (12.56us + 1us + 4us) So expected upper sampling rate is 56.9 ksps. Nyquist frequency for this sampling rate is therefore 28 kHz. If this is right, it suggests the (theoretical) performance suitability of this chip's A/D is for signals that are bandlimited to 28 kHz. Is this a correct interpretation of the information given in the data sheet in obtaining the Nyquist performance limit? Any opinions on the noise susceptibility of ADCs in PIC / dsPIC chips would be much appreciated! AKE

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