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  • O'Reilly book clarification on 2d linear system

    - by Eric
    The Oreilly book "Learning openCV" states at page 356 : Quote Before we get totally lost, let’s consider a particular realistic situation of taking measurements on a car driving in a parking lot. We might imagine that the state of the car could be summarized by two position variables, x and y, and two velocities, vx and vy. These four variables would be the elements of the state vector xk. Th is suggests that the correct form for F is: x = [ x; y; vx; vy; ]k F = [ 1, 0, dt, 0; 0, 1, 0, dt; 0, 0, 1, 0; 0, 0, 0, 1; ] It seems natural to put 'dt' just there in the F matrix but I just don't get why. What if I have a n states system, how would I spray some "dt" in the F matrix?

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  • How to access files in interior of an iPhone App?

    - by mxg
    Hi everyone! I need in a iPhone app to access files that the app is build with(.plist etc). There's an hardcoded way to do this: NSString *appDir = [[[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByDeletingLastPathComponent] stringByAppendingPathComponent:appFolder]; where appFolder is the name of folder app, like "test.app". After the appDir is known, to access files is simple. Is there any other, not-hardcoded way to have access to files form the app? Thanks in Advance!

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  • Trying to catch integrity error with sqlaclhemey

    - by Lostsoul
    I'm having problems with trying to catch a error. I'm using pyramid/sqlalchemy and made a sign up form with email as the primary key. The problem is when a duplicate email is entered it raises a IntegrityError, so I'm trying to catch that error and provide a message but no matter what I do I can't catch it(the error keeps appearing). try: new_user = Users(email, firstname, lastname, password) DBSession.add(new_user) return HTTPFound(location = request.route_url('new')) except IntegrityError: message1 = "Yikes! Your email already exists in our system. Did you forget your password?" I get the same message when I tried except exc.SQLAlchemyError (although I want to catch specific errors and not a blanket catch all). Is there something wrong with my python syntax? or is there something I need to do special in sqlalchemy to catch it?

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  • Autocomplete with Django, jQuery and google app engine

    - by Ron
    Hey guys, I'm new to Django and jQuery, but I have a lot of python experience. I'm basically trying to write an HTML form, with one text box for now, that as you type in it, shows you auto completion options. this will be used for finding restaurants, and I intend to use the Yelp API for that. can someone please point me out in a direction of a tutorial on how to do this - specifically with regards to the Django / HTML / jQuery rather than how to work with the Yelp API? Are there any tutorials I should read? All tutorials I have found are very basic ones that build forms from the Django data models.. Thanks!

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  • Properties are making trouble

    - by DhavalR
    In my application I have added a Properties.cs file which contains properties that I am would use through out the application. I am getting NullReferenceException = Object reference not set to an instance of an object. Here is the code for Properties.cs public class Properties { private static string type1; public static string Type1 { get { return type1; } set { type1= value; } } } And when I access this property in one of my form I am getting error. e.g. if (Properties.Type1.Equals(string.Empty) || Properties.Type1.Equals(null)) { //// Do something }

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  • Changeing scaling of Matlab Figure

    - by Phil
    Hi, I have a figure that displays 20.000 points on the x-axis. So it labels the x-axis from 0 .. 20.000. However, now I would like to scale it form 0 to 50. But when I try to do this in the plot window it just shows me the first 50 points, instead of changeing the scale. Is there any straightforward way to do that in Matlab? Many thanks for your help!

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  • PHP: $_POST array to XML file and display results.

    - by user633264
    I'm creating a "Madlibs" page where visitors can create funny story things online. The original files are in XML format with the blanks enclosed in XML tags (Such as blablabla <PluralNoun></PluralNoun> blablabla <Verb></Verb> ). The form data is created using XSL and the results are saved using a $_POST array. How do I post the $_POST array between the matching XML tags and then display the result to the page? I'm sure it uses a "foreach" statement, but I'm just not familiar enough with PHP to figure out what functions to use. Any help would be great. Thanks, E

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  • ASP.NET - DropDown DataBinding (Rebind?)

    - by Bob Fincheimer
    I have a drop down which has a method which binds data to it: dropDown.Items.Clear() dropDown.AppendDataBoundItems = True Select Case selType Case SelectionTypes.Empty dropDown.Items.Insert(0, New ListItem("", "")) Case SelectionTypes.Any dropDown.Items.Insert(0, New ListItem("ANY", "")) Case SelectionTypes.Select dropDown.Items.Insert(0, New ListItem("Select One", "")) End Select BindDropDown(val) The BindDropDown method simply sets the datasource, datakeyname, datavaluename, and then databinds the data. For a reason which I cannot avoid, I MUST call this method twice sometimes. When it is called twice, All of the databound items show up two times, but the top item (the one I manually insert) is there only once. Is ASP doing something wierd when i databind twice even though i clear the list between? Or does it have to do something with the viewstate/controlstate? EDIT__ The entire page, and this control has EnableViewState="false" EDIT___ The dropdown is inside a form view. After the selected value is set I have to rebind the dropdown just in case the selected value is not there [because it is an inactive user]. After this, the formview duplicates the databound items.

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  • ASP MVC dynamic fields in editor

    - by Michael Pardo
    I have a form which will include some optional questions that need to asked of the user. In my model it may look like pubic Dictionary<String, String> Questions { get; set; } where the key is the label and value is the text box. How can I create and populate controls for this? I'm new to ASP MVC, but it makes sense that something like this would be built in. Is there a built in way to do this, or do I have to implement it myself? It seems like there should be a helper for it, since you don't really want to put this kind of code in the view. I've tried Html.EditorFor(model => model.Questions); but it just spits out "[key, value]" to the view.

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  • Best tools to parse reports

    - by Andy Schaefer
    I have a report that I need to parse/scrape for loading into an alternate or query-able data store. The report looks like something akin to: this. My gut is that PERL would do a decent job, but I have several different permutations of the report and I don't really want to make a script around each form. This report is a pretty stock type report, and I have seen where Monarch Pro can parse these types of reports, but I have had a difficult time finding alternatives to how these could be parsed since I'm looking to do this working primarily in a Linux environment. Any suggestions?

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  • Creating Discoverable Network Resources (.NET)

    - by Ady
    Is it possible to create a discoverable network resource in .NET? What I would like to acheive is a means of auto discovery for applications that run on a private network. The architecture will be similar to a client / server application, however the server could be any computer on the network. While the client would not be aware of the specific IP address that would be the server. I assume I would need some form of multicast, however not having used multicasting before I don't even know where to start. I guess when the client starts up it would broadcast an "is anyone there" message. Then each server could respond with details of their IP for future communication. Many Thanks, Ady

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  • How to use Socket in AC3 or other solution for using embedded flash without cross domain policy?

    - by monkey_boys
    How to use Socket in AC3 or other solution for using embedded flash without cross domain policy? I would like to create a project that uses HTTP to post to some website's form by using embedded flash in a webpage. When I finished the project, I tried to embed on the local computer and that work fine but when I uploaded to a web server in the some domain and requested to some different domain it stopped working. I know that's the security of ac3 but I would like to use embedded flash. Does anybody have any idea about this?

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  • PHP: How do I have a variable hhtp-header value for my GET request?

    - by Cortopasta
    I want the user to submit an answer to a question, then upon submission be redirected back to the page where they asked the question and I can't seem to get this to work: if (!isset($_POST['answer']) && !isset($_POST['verse'])) { echo "Please fill out form."; } elseif (!isset($_POST['answer']) || !isset($_POST['verse'])) { echo "one field left blank"; } else { $user->submitAnswer($question_id); header("Location: welcome.php?question_id=$question_id"); exit; } What am I doing wrong? EDIT: Sorry, wasn't very clear. I'm trying to pass the variable $question_id to the header(location: part so that it will pull up the question they were just on and show the answer they posted

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  • Apply dynamic list of templates to an argument

    - by Diego Martinez
    I need apply a variable sequence of templates to an argument. example 1: arg:tpl1():tpl2():...:tplN() Suppose that i have other multi valued argument, and each value is the name for a dynamic template invocation. ¿What is the better form of apply all the templates from the list to my argument? tplNames : {name | <(name)(arg)>} not works, just apply a template ever to the same innitial value of my argument, i need the same result of example 1 but in a dynamic way. Thank you!!

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  • jQuery event fires on doc ready

    - by gmcalab
    I am trying to set the click event of a button on my form and for some reason I am getting weird behavior. When I bind the click event to a function that takes no arguments, things seem to work fine. But when I bind the event with a function that takes an argument, the event fires on document ready and on click. Any ideas? Example 1: This causes an alert box to fire on ready and when the button is clicked. jQuery(document).ready(function(){ $('myButton').click(alert('foo')); }); Example 2: This causes an alert box to fire ONLY when the button is clicked. jQuery(document).ready(function(){ $('myButton').click(wrapper); }); // External js file function wrapper(){ alert('bar'); }

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  • Determine the lat lngs of markers within a polygon

    - by subh
    I have a google maps app which plots markers as it loads. One of the new requirment is to to add a Polygon overlay encompassing a selection of markers by the user. I was able to achieve that using the Geometry Controls of the GMaps Utility Library Now, the next step is to form a group of the selected markers for which I would need to determine if the lat lngs of the markers falls within the lat lngs of the polygon? Is there a way to determine the lat lngs of a polygon and compute if the marker's lat lng is within its boundaries?

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  • Web framework recommendation for python (webservices, auth, cache, ...)

    - by illuminated
    Hi all, Googling for the past week, but cannot finally decide which python web framework would be right for me. The web app I'm about to develop would be almost completely "pure" html with js (jQuery). Server side would have to do the following: authentication session management caching web services (almost all the on page data would be pulled with jQuery through web services) secured web services (through some form of authentication; this is for remote accessing some of the web services though other web apps, desktop/mobile applications) If there is a good tutorial/guide/idea for how to do this in Django I would be most thankfull if someone could share it as I already have experience with it. The thing that made me start thinking about other frameworks is Django's built in ORM. I know I could swap it with SQLAlchemy, but wouldn't go down that road if I'm not sure all the rest of the requirements is supported. Thanks all in advance.

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  • SQL Query in NHibernate diction

    - by Jan-Frederik Carl
    I have a SQL Query which works in SQL Management Studio: Select Id From table t Where t.Date= (Select Max(Date) From ( Select * From table where ReferenceId = xy) u) Reason is, from all entries with a certain foreign key, I want to receive the one with the highest date. I tried to reform this Query for use in NHibernate, and I got IQuery query = session.CreateQuery(String.Format( @"Select t.Id From table t Where t.Date = (Select Max(Date) From (Select * From table t where t.ReferenceItem.Id = " + item.ReferenceItem.Id + ")u)")); I get the error message: "In expected" How do I have to form the NHibernate query? What does the "In" mean?

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  • Can I load the max value of the range attribute in CFINPUT using and AJAX call?

    - by Eric Belair
    I have a CFINPUT tag in a CFFORM: <cfinput type="text" id="itemInput" name="itemInput" /> I want to set the range dynamically without posting the page. I have several AJAX calls throughout the page to dynamically load form fields on the fly: <cfselect id="this" name="this" bind="cfc:Data.getThis()" bindonload="true" /> <cfselect id="that" name="that" bind="cfc:Data.getThat({p1})" /> <cfselect id="theOther" name="theOther" bind="cfc:Data.getTheOther({p1}, {p2})" /> <cfdiv id="maxQty" bind="cfc:Data.getMaxQty({itemId})" /> <cfinput type="text" id="qty" name="qty" /> <cfdiv id="itemId" bind="cfc:Data.getItemId({this}, {that}, {theOther})" /> In the above CFFORM, I basically want to set the minValue of the range to "1" and the maxValue of the range to the value of cfc:Data.getMaxQty({itemId}). Is this possible? How can I do it?

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  • VS2010 is removing code from designer without warning - causing issues

    - by schmoopy
    I have a WinForm with a pretty complex layout (has lots of controls, panels, etc.) Whenever i open the form the file is automatically checked out from source control and it removes anything in the designer file that refereces my menustrip or statusstrip ie: the following get removed (w/o warning) Me.MyMenuStip.SuspendLayout() Me.MyStatusStrip.SuspendLayout() Me.MyMenuStrip.ResumeLayout(False) Me.MyMenuStrip.PerformLayout() Me.MyStatusStrip.ResumeLayout(False) Me.MyStatusStrip.PerformLayout() The code still builds, but there are no Menu or Status items rendered. Any ideas on what i can do? I do not want to just remove/add the menustrip for instance cause i would loose all of my menu items (and there are a lot) Thanks in advance!

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  • Are there any good resources on developing ASP.NET for Windows CE Internet Explorer?

    - by IronicMuffin
    I've been tasked with creating a web app to be consumed by a mobile device sporting Windows CE 5.0 (and some with Windows CE 4.2). I've found a host of things that seem to work fine in IE6 on my desktop, but fail when rendered in IE for Windows CE. IE6 is bad enough as it is...does it lose any more functionality on an embedded system? Are there quirks that a developer would need to know about? AJAX seems extremely unlikely. JavaScript seems quirky when linking to a .js file. Panels with scrollbars are finicky. Textboxes can't get focus. DefaultButtons on a form don't work. Any help or resources you can provide would be greatly appreciated.

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  • referesh datagridview after database update in vb.net

    - by Gbolahan
    Dim myQuery = "UPDATE table1 SET data= CONCAT (data,'" & vbCrLf & "[ " & Date.Now() & " ]" & " " & "[" & getCN() & "]" & " " & txtTelenotes.Text & "[ item1 ]" & "') WHERE id='" & txtID.Text & "'" myCommand.Connection = conn myCommand.CommandText = myQuery myAdapter.SelectCommand = myCommand Dim myData As MySqlDataReader myData = myCommand.ExecuteReader() txtTelenotes.Text = "" dgvREcord.Refresh() tried refreshing the datagridview using dgvREcord.Refresh() but it does not load the changes form the database. Any help Pls.. Thanks.

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  • How can I loop over a query for a specific number of times that may be greater than the result?

    - by JS
    I need to loop over a query exactly 12 times to complete rows in a form but rarely will the query return 12 rows. The cfquery endRow attribute doesn't force the loop to keep going if the result is < 12. If it did that would be ideal to use something like cfloop query="myQuery" endRow="12"... The 2 options that I have now are to skip the loop and write out all 12 rows but that results in a lot of duplicate code (there are 20 columns), or do a query of queries for each row which seems like a lot of wasted processing. Thanks for any ideas.

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  • [Rails] HTTP Get Request

    - by Karl
    I've been trying to get Rails to play with the new Facebook Graph API. After I get the authorization "code", I need to send another request which returns the access token in JSON form. It seems to work fine, however I want to fetch the access token JSON without redirecting the user. I'm attempting to use Net::HTTP.get, but I'm not sure how to use it to get a request body, or even if it's the right thing to use to begin with. Can anyone give an example of performing an HTTP GET?

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  • Captcha Alternative, how secure?

    - by aslum
    I do the web page for my local library, and I was thinking it might be kind of appealing to have a "custom" captcha based on book covers. So serve up one of several dozen book covers, and have the patron filling out the form type the book title to prove they're human. Assuming I stripped the title/author info from the image and filename, would that be enough? Would the fact that it was a unique system on a fairly small website be enough to make it effective? Just how tricky are the spam bots these days? Would having the image name be the ISBN # be too obvious?

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