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  • Toubleshooting mapkit performance

    - by brettr
    I'm plotting over 500 points on a map using mapkit. Zooming is a little jittery compared to the native google map app. I've discovered what is causing the slowness. I'm adding custom annotations so that I can later add different pin colors and buttons for detail views: - (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(AddressNote *) annotation { MKPinAnnotationView *annView=[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"currentlocation"]; annView.pinColor = MKPinAnnotationColorGreen; annView.animatesDrop=TRUE; annView.canShowCallout = YES; annView.calloutOffset = CGPointMake(-5, 5); return annView; } If I comment out the above code, everything works fine. Very smooth with zooming in/out. Should I be adding annotations differently to boost performance?

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  • What is the main purpose and sense to have staging server the same as production?

    - by truthseeker
    Hi, In our company we have staging and production servers. I'm trying to have them in state 1:1 after latest release. We've got web application running on several host and many instances of it. The issue is that I am an advocate of having the same architecture (structure) of web applications on staging and production servers to easily test new features and avoid creating of new bugs with new releases. But not everyone agree with me, and for them is not a such big deal to have different connection between staging application instances. Even maybe to have more application and connections between application on staging than on production server. I would like to ask about pros and cons of such an approach? I mean some good points to agree with me, or some bad why maybe i don't have right. Some examples of consequences and so forth.

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  • Factory Girl Association

    - by David Lyod
    I have an association of a Admin - Account in factory girl I now wish to associate a second user with the same account but am unable to do so. I build my Admin-Account association like this u.account { |account| account.association(:account)} This works fine and creates the Account and Admin association. Im looking for a way to setup a second user who's account also points to the record created in the Admin factory association. I currently just build the second user as such @user = Factory.build(:seconduser) @user.account = Account.first @user.save! Which works but seems somewhat hacky .

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  • Use eval to set unknown property in Python

    - by Mahi
    I have an User class, that has multiple properties inside it, and I also have addPoint method for User class, which allows user to input points into any of it's properties. However, there can be up to like 500 properties, everyone can have different ones, etc. So it would be a pain in the ass to code every property with "if: - elif:". Now this is what I tried to do, to make it much easier and cleaner: class User: def __init__(self): self.health = 0 self.speed = 0 def addPoint(self, property, amount): eval("self."+property) = eval("self."+property) + amount And now when I'd do fe. u = User() u.addPoint("health", 5) I would like it to do this: self.health = self.health + 5, and that's what I used the eval()s for. However, Python's just giving me error: can't assign to function call. I'm not trying to assign the eval() function call itself, I'm trying to assign the returned value from eval(), so how could I do this the easiest way?

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  • Shipping Integration into a Rails App

    - by MikeH
    I'm working on integrating a shipping solution into a Rails ecommerce app. We're only going to use one shipping provider. So the question is: Fedex or UPS? I'm wondering what Rails developers think about the tech side of this question. What do you think about the APIs, ease of integration, focus on developer's needs between Fedex and UPS? I was leaning towards Fedex, but from looking at the developers resources sections of both sites, it seems that UPS might be more developer friendly. Also, I'm going to be using Shopify's active_shipping gem: http://github.com/Shopify/active_shipping And I also based my app off the Spree Ecommerce solution, but I don't think that's particularly relevant to the question. Spree wrote a wrapper to integrate active_shipping with the Spree system. I gave away all my points, so SO wont' let me post another link in this question. But if you google "Spree active-shipping", their wrapper on github is the first result. Thanks.

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  • how to apply Discrete wavelet transform on image

    - by abuasis
    I am implementing an android application that will verify signature images , decided to go with the Discrete wavelet transform method (symmlet-8) the method requires to apply the discrete wavelet transform and separate the image using low-pass and high-pass filter and retrieve the wavelet transform coefficients. the equations show notations that I cant understand thus can't do the math easily , also didn't know how to apply low-pass and high-pass filters to my x and y points. is there any tutorial that shows you how to apply the discrete wavelet transform to my image easily that breaks it out in numbers? thanks alot in advance.

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  • Django: tinyMCE and cross site javascript

    - by pistacchio
    Hi, follow this question, I was able to set some textareas in my admin page as richtext inputs. The most voted answer suggests to follow an example and is what i did. Also, it talks about a problem concerning "blank pages". I'm having the same problem and I'm not able to solve it. I have my media files served by a different server, so MEDIA_URL points to a different host with a different port. To simulate this in my dev environment, I also serve media files from a different port. Debugging the failing javascript, Chrome yelds: Unsafe JavaScript attempt to access frame with URL http://localhost:8000/admin/blog/post/add/ from frame with URL http://localhost:88/s3mangerie/js/tiny_mce/themes/advanced/image.htm. Domains, protocols and ports must match. How to solve this problem? Thanks

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  • Calculating co-ordinate of a point on a path given a distance

    - by Alex
    I'm working on a project that surveys the condition of a road or highway using a calibrated trip computer connected to a rugged-PC. An operator keys in defect codes as they travel along a pre-defined route. I need to show an indicator on the map screen that shows the vehicles current position, taking into account the distance data from the trip computer. I know the exact lat lon co-ordinates at the starting point of each section of road, and the road is made up of a series of points. The question is: how can I calculate the lat lon co-ordinates of the vehicle assuming that it has continued on the route and traveled a certain distance (e.g. 1.4km). The co-ordinates would be 'locked onto' the road line, as shown in blue on the diagram below. Thanks, Alex

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  • cmake: Target-specific preprocessor definitions for CUDA targets seems not to work

    - by Nils
    I'm using cmake 2.8.1 on Mac OSX 10.6 with CUDA 3.0. So I added a CUDA target which needs BLOCK_SIZE set to some number in order to compile. cuda_add_executable(SimpleTestsCUDA SimpleTests.cu BlockMatrix.cpp Matrix.cpp ) set_target_properties(SimpleTestsCUDA PROPERTIES COMPILE_FLAGS -DBLOCK_SIZE=3) When running make VERBOSE=1 I noticed that nvcc is invoked w/o -DBLOCK_SIZE=3, which results in an error, because BLOCK_SIZE is used in the code, but defined nowhere. Now I used the same definition for a CPU target (using add_executable(...)) and there it worked. So now the questions: How do I figure out what cmake does with the set_target_properties line if it points to a CUDA target? Googling around didn't help so far and a workaround would be cool..

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  • Codeigniter Routes for filename with extension

    - by thehuby
    I am using codeigniter and its routes system successfully with some lovely regexp, however I have come unstuck on what should be an easy peasy thing in the system. I want to include a bunch of search engine related files (for Google webmaster etc.) plus the robots.txt file, all in a controller. So, I have create the controller and updated the routes file and don't seem to be able to get it working with these files. Here's a snip from my routes file: $route['robots\.txt|LiveSearchSiteAuth\.xml'] = 'search_controller/files'; Within the function I use the URI helper to figure out which content to show. Now I can't get this to match, which points to my regexp being wrong. I'm sure this is a really obvious one but its late and my caffeine tank is empty :)

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  • regex to format a float in php

    - by Itamar Bar-Lev
    I have a PHP function for formatting a float to a given amount of decimal points that uses number_format(), and then removes the unneeded zeros (and also the '.' if possible): $float = number_format($float, $decimalPlaces, '.', ''); for ($i = 0; $i < $decimalPlaces; $i++) { if (substr($float, strlen($float) - 1, strlen($float)) == '0') { $float = substr($float, 0, strlen($float) - 1); } } if (substr($float, strlen($float) - 1, strlen($float)) == '.') { $float = substr($float, 0, strlen($float) - 1); } Is it possible to do so more effectively with a regular expression?

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  • Redimming arrays in VBA

    - by Mike
    I have 3 arrays of data, that are filled by reading off of an excel sheet, some of the points of data are missing and as such have just been entered into excel as "NA" so I want to look through my array and find each instance of these NA's and remove them from the array since the information is useless. I need to update all three arrays at the same time. Sub group_data() Dim country(), roe(), iCap() As String Dim i As Integer For i = 1 To 3357 country(i) = Workbooks("restcompfirm.xls").Worksheets("Sheet1").Range("C1").Offset(i, 0) roe(i) = Workbooks("restcompfirm.xls").Worksheets("Sheet1").Range("AP1").Offset(i, 0) iCap(i) = Workbooks("restcompfirm.xls").Worksheets("Sheet1").Range("BM1").Offset(i, 0) Next i End Sub So if I find a "NA" as one of the values in roe or iCap I want to get rid of that piece of data in all there arrays.

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  • Pocket IE onmousedown onmousemove onmouseup ?

    - by eidylon
    Hello all, I have a control which I wrote for capturing signatures on a web page, by using onmousedown, onmousemove and onmouseup on a div to track the mouse, and capture points comprising a signature. Now we need this to work on Windows Mobile 6.5 powered devices... but it seems that the div element does not support the mouse events in Pocket IE, which would seem to be supported by this blog. But according to MSDN, the WinCE (which WinMo/PPC is based off of) version of IE does support these mouse events for some unknown list of elements. So can anyone tell me, are there any elements: img, a, span or whatever that support onmouse[down|move|up] in WinMo 6.5 Pocket IE? Thanks! If not, anyone have any other ideas for capturing a signature on a web page in Pocket IE?

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  • Building a complete online payment gateway like Paypal

    - by John Stewart
    So this question isn't about integrating an existing payment gateway into my site. This is more of a architectural question. I want to build a system similar to Paypal. Now I understand that Paypal offers a lot of features under the roof and I can't implement all of them at once. I want to implement the core functionality of Paypal and other such services. So my question is (rather discussion is) around how would one go about building such a system. Some points to discuss: Handle payments through existing banks. I am guessing that I would need access to local bank protocols to get this. Allow users to securely store and process their payments How does Paypal handle the transactions? Thoughts?

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  • How to get nearby POIs

    - by balexandre
    I have a database with Points of Interest that all have an address. I want to know what is the method/name/call to get all nearby POIs from a given position. I understand that I need to convert all my addresses to LAT / LON coordinates at least, but my question is: for a given LAT / LONG how do I get from the database/array what POIs are nearby by distance, for example: You are here 0,0 nearest POIs in a 2km radius are: POI A (at 1.1 Km) POI C (at 1.3 Km) POI F (at 1.9 Km) I have no idea what should I look into to get what I want :-( Any help is greatly appreciated. Thank you

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  • Graph Generation in flex

    - by Roshan
    I need to generate a graph using the following XML in FLEX. [Bindable] public var stockDataAC:ArrayCollection = new ArrayCollection( [ {date: "2010, 4, 27", close: 41.71}, {date: "2010, 4, 28", close: 42.21}, {date: "2010, 5, 2", close: 42.71}, {date: "2010, 5, 3", close: 42.99}, {date: "2010, 5, 4", close: 44} ]); .............. < mx:horizontalAxis < mx:DateTimeAxis dataUnits="days" displayLocalTime="true" parseFunction="myParseFunction" / < /mx:horizontalAxis But this displays the graph from 2010/4/27 till 2010/5/4 including 2010/4/29, 2010/4/30 and 2010/5/1. I require the graph to display only the points in XML and exclude remaining thought it lies in between since it contains no data. How this can be done?

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  • Drawing graphs in MS Excel somehow got complicated

    - by Ivan
    I want to draw several graphs and combine them into one figure. I will explain the problem in an example. Let's say that I want to draw two graphs with these points: Graph #1 (X and Y are defining a coordinate). X - Y _____ 1 - 5 2 - 5 5 - 7 9 - 10 Graph #2 X - Y _____ 6 - 8 8 - 12 9 - 7 12 - 8 15 - 11 21 - 11 What I do is that I create a chart and click on "Select Data". There I create two series and choose X and Y values. However, this doesn't work since it doesn't allow me to choose different X values for different graphs. Although I choose different for these two series, the second one is chosen for both. This is how it looks like in the end: Do you know how to fix this? I'm using Excel 2008 for Mac.

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  • C# Drawing Oracle Spatial Geometries

    - by Keeper
    I need to create a simple app which can display geometries from Oracle Spatial in C#. These geometries are exported from AutoCAD Map 3D 2010 to Oracle Spatial. I need to pan, zoom, manage layers of these objects, events (like right click to popup a contextual menu, potentially different for every object), creating/deleting points (maybe also other polygons): a sort of simple AutoCAD interface. Should I look for an AutoCAD OEM license? Is there a drawing framework which can handle this or do I need to create my own?

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  • Any really modern, good-looking desktop apps that are developed with PyQt/PySide?

    - by Edwin
    Hi, I have started using Python for web development recently, it's kinda cool; I have seen programs that are developed in QT/C++, which is good enough in terms of esthetics; I have just noticed the new PySide project (which brings LGPL Qt license to Python and it doesn't support Windows yet). In view of the above, I see the possibility of using Python + PyQt/PySide to develop cross platform apps in the future :) but I have several doubts right now: Can PyQty/PySide be used to develop really complex/modern UI? Can somebody give me some points to have a look at some nice-looking screenshots of apps that are developed in Python+QT? What about the performance? Thanks in advance!

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  • Retail knowledge inference

    - by blueomega
    So i am doing a research on how can i infer knowledge from reports (not with a specific format), but after pre processing, i should have some kind of formatted data. A fairly basic inference would be: "Retailer has X stock." and "X is sellable." - "Retailer sells X" the knowledge i focus is retail domain oriented, and if possible i should improve its efficiency with each iteration. Is this scifi(some of my friends think it is)? The related stuff i find online are "expert systems" that find anomalies, fuzzy inference systems and some rants about "easy knowledge". Can you help me with some points for me to focus or orient me in some research directions? blueomega

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  • Prepare and import data into existing database

    - by Álvaro G. Vicario
    I maintain a PHP application with SQL Server backend. The DB structure is roughly this: lot === lot_id (pk, identify) lot_code building ======== buildin_id (pk, identity) lot_id (fk) inspection ========== inspection_id (pk, identify) building_id (fk) date inspector result The database already has lots and buildings and I need to import some inspections. Key points are: It's a one-time initial load. Data comes in an Excel file. The Excel data is unaware of DB autogenerated IDs: inspections must be linked to buildings through their lot_code What are my options to do such data load? date inspector result lot_code ========== =========== ======== ======== 31/12/2009 John Smith Pass 987654X 28/02/2010 Bill Jones Fail 123456B

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  • Entity Framework: Data Centric vs. Object Centric

    - by Eric J.
    I'm having a look at Entity Framework and everything I'm reading takes a data centric approach to explaining EF. By that I mean that the fundamental relationships of the system are first defined in the database and objects are generated that reflect those relationships. Examples Quickstart (Entity Framework) Using Entity Framework entities as business objects? The EF documentation implies that it's not necessary to start from the database layer, e.g. Developers can work with a consistent application object model that can be mapped to various storage schemas When designing a new system (simplified version), I tend to first create a class model, then generate business objects from the model, code business layer stuff that can't be generated, and then worry about persistence (or rather work with a DBA and let him worry about the most efficient persistence strategy). That object centric approach is well supported by ORM technologies such as (n)Hibernate. Is there a reasonable path to an object centric approach with EF? Will I be swimming upstream going that route? Any good starting points?

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  • How do you get Eclipse/Mylyn to fill out your commit messages for you?

    - by Sam Hasler
    I've setup the following: Installed Mylyn in Eclipse Installed the Bugzilla connector Installed Subversive SVN Integration for the Mylyn Project I've gone to Windows - Preferences - Tasks - Team and clicked Change Set Management and left it with the default Commit Comment Template: ${task.status} - ${connector.task.prefix} ${task.key}: ${task.description} ${task.url} However, if I activate a bugzilla bug in the Task List, and then edit a file, when I commit the changes the commit message isn't filled in. Also, in the Synchronisation perspective there isn't a change set for the task I'm working on. I've tried following the instructions on the Eclipse wiki's Mylyn FAQ for Why does task change set not appear when I modify files? but the bullet point: * Verify that the configured Synchronize View is configured for change sets. points to a section that is no longer in the document. I have a Show Change Sets button, but clicking it only shows me incoming change sets, there aren't any outgoing change sets. What am I missing?

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  • When getting substring in .Net, does the new string reference the same original string data or does

    - by Elan
    Assuming I have the following strings: string str1 = "Hello World!"; string str2 = str1.SubString(6, 5); // "World" I am hoping that in the above example str2 does not copy "World", but simply ends up being a new string that points to the same memory space only that it starts with an offset of 6 and a length of 5. In actuality I am dealing with some potentially very long strings and am interested in how this works behind the scenes for performance reasons. I am not familiar enaugh with IL to look into this.

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  • Projection matrix + world plane ~> Homography from image plane to world plane

    - by B3ret
    I think I have my wires crossed on this, it should be quite easy. I have a projection matrix from world coordinates to image coordinates (4D homogeneous to 3D homgeneous), and therefore I also have the inverse projection matrix from image coordinates to world "rays". I want to project points of the image back onto a plane within the world (which is given of course as 4D homogeneous vector). The needed homography should be uniquely identified, yet I can not figure out how to compute it. Of course I could also intersect the back-projected rays with the world plane, but this seems not a good way, knowing that there MUST be a homography doing this for me. Thanks in advance, Ben

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