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• Is this a situation where Qt Model/View architecture is not useful?

  - by csmithmaui

  Hi, I am writing a GUI based application where I read a string of values from serial port every few seconds and I need to display most of the values in some type graphical indicator(I was thinking of QprogressBar maybe) that displays the range and the value. Some of the other data that I am parsing from the string are the date and fault codes. Also, the data is hierarchical. I wanted to use the model/view architecture of Qt because I have been interested in MVC stuff for a while but have never quite wrapped my brain around how to implement it very well. As of now, I have subclassed QAbstractItemModel and in the model I read the serial port and wrap the items parsed from the string in a Tree data structure. I can view all of the data in a QtreeView with no issues. I have also began to subclass QAbstractItemView to build my custom view with all of the Graphical Indicators and such. This is where I am getting stuck. It seems to me that in order for me to design a view that knows how to display my custom model the view needs to know exactly how all of the data in the model is organized. Doesn't that defeat the purpose of Model/View? The QTreeView I tested the model with is basically just displaying the model as it is setup in the Tree structure but I don't want to do that because the data is not all of the same type. Is the type of data or the way you would like to present it to the user a determining factor in whether or not you should use this architecture? I always assumed it was just always better to design in an MVC style. It seems to me like it might have been better to just subclass QWidget and then read in from the serial port and update all of subwidgets(graphical indicators, labels, etc...) from the subclass. Essentially, do everything in one class. Does anybody understand this issue that can explain to me either what I am missing or why I shouldn't be doing it this way. As of now I am a little confused. Thanks so much for any help!

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• millions of 3d points how to 10 closest to origin

  - by Kazoom

  A point in 3-d is defined by (x,y,z). Distance d between any two points (X,Y,Z) and (x,y,z) is d= Sqrt[(X-x)^2 + (Y-y)^2 + (Z-z)^2]. Now there are a million entries in a file, each entry is some point in space, in no specific order. Given any point (a,b,c) find the nearest 10 points to it. How would you store the million points and how would you retrieve those 10 points from that data structure.

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• Millions of 3D points: How to find the 10 of them closest to a given point?

  - by Kazoom

  A point in 3-d is defined by (x,y,z). Distance d between any two points (X,Y,Z) and (x,y,z) is d= Sqrt[(X-x)^2 + (Y-y)^2 + (Z-z)^2]. Now there are a million entries in a file, each entry is some point in space, in no specific order. Given any point (a,b,c) find the nearest 10 points to it. How would you store the million points and how would you retrieve those 10 points from that data structure.

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• Linux cc compliation of library in directory within project?

  - by leeand00

  My directory structure looks like the following: -xmllib -libxml++-1.0.a -main.cc ..and I issue the command: cc -lstdc++ -L./xmllib -llibxml++-1.0.a main.cc But then it tells me that it can't find the binary for the library...even though I issued the command from the root directory. /usr/bin/ld: cannot find -llibxml++-1.0.a main.cc collect2: ld returned 1 exit status Is there any reason why cc can't find the binary library? I'm using cc version 2.96 (yes, it's old).

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• Location Based Search (Lat,Long) TSQL MS Server 2003 R2

  - by Chad Sellers

  Group, I'm looking for a query that can do a location search in radians with in a binding box. With a table structure like ProductID,latitude,longitude,timestampGMT. Any helpful suggestions. Chad

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• PHP OOP question about reference

  - by Starmaster

  Can one please explain with example what does $obj-$a()-$b mean? I've used PHP OOP quite a long time and have seen in some places this structure and not just this $obj-$a(); In what cases should I use it? Thanks in advance!

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• Multidimensional Array with different types in java

  - by Christian

  I want to store a data structure thats a table with one column Strings and another column of Ints. List<Entry<String, Integer>> li = new LinkedList<Entry<String, Integer>>(); would do the job for a list but I would rather have the performance of an array. I tried Entry<String, Integer>[] = new Entry<String, Integer>[10]; but that doesn't seem to work.

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• How to receive XMLHttpRequest with PHP?

  - by Adrian

  I would like to be able to read XMLHttpRequest that is sent to a PHP page. I am using prototype's Ajax.Request function, and I am sending a simple XML structure. When trying to print the POST array on the PHP page, I don't get any output. Any help appreciated.

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• ErrorException [ Fatal Error ]: Class 'Controller' not found - Kohana 3.0.3 Error

  - by Asif

  Hi, I am (newbie) using Kohana V 3.0.3 and my directory structure is: pojectsys (kohana's system directory) parallel to htdocs directory C:\xampp\pojectsys and my application directory is in htdocs C:\xampp\htdocs\examples Inside C:\xampp\htdocs\examples\index.php, following variables have been set: $application = 'C:\xampp\htdocs\examples\application'; $system = 'C:\xampp\pojectsys'; Now when I am trying to execute http://lc.examples.com/ then Kohana returns error: ErrorException [ Fatal Error ]: Class 'Controller' not found for line 3 class Controller_Welcome extends Controller { Please help me to resolve this issue.

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• Berkeley DB java edition, any LGPL or BSD alternatives in Java?

  - by Ali

  Hi All, I am dealing with a huge dataset consisting of key-value pairs. The queries are always in the form of range queries on the key space (keys are numbers) hence any persistent B-Tree like structure will handle the situation. I would like to use BDB-Java Edition but the product is closed source and my company doesn't want to buy BDB-JE License. I am wondering, would you please share your experience with any non-GPL java based key-value storage system. Thanks, -A

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• Perl vs Python but with more style than normally

  - by user350571

  I'm learning perl and everytime I search for perl stuff in the internet I get some random page with people saying that perl should die because code written in it looks like a lesson in steganography. Then they say that python is clean and stuff like that. Now, I know that those comparisons are always stupid and made by fellows that feel that languages are a extension of their boring personality so, let me ask instead: can you give me the implementation of a widely known algorithm to deal with a data structure like red-black trees in both languages so I can compare?

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• Need dictionary database

  - by Bragaadeesh

  Hi, I am planning to work in TRIE data structure for which I need a dictionary database or a text or word file containing the entire list of english words. It doesnt matter if the size is huge. Larger the better.

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• How to burn video DVD from c#?

  - by LILkillaBEE

  I need to burn video dvd from my web cam in C# application? What is the right way to do it? What are required steps? I guess I must create image with right folder structure and MPEG2 video and then burn it to DVD? IMAPI2?

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• Rotating sql table

  - by Sathish

  my sql talble has the following structure F1 F2 F3 F4 F5 Group 1 2 3 4 Design 5 6 7 8 now i want to read this and return a query result as show below please help F1 Value Group 1 Group 2 Group 3 Group 4 Design 5 Design 6 Design 7 Design 8

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• Multilanguage website sitemap

  - by Alex

  My site is i18n based on the following structure: mydomain.com/en mydomain.com/en/product/blue-widgets mydomain.com/fr mydomain.com/fr/product/blue-widgets The site is internationalised not localised, therefore i don't want to GEO target specific locals just target "french" or "english" speaking users. When submitting a sitemap to the search engines should i send one sitemap with links to all the different language versions or have one separate sitemap for each language. Is that even possible?

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• Very odd build problem

  - by user144182

  When I build my solution, it complains about a missing referenced DLL. When I rebuild it, the problem goes away. Whenever I do a clean this returns, i.e. have to attempt a build twice before it succeeds. This is vague, but if warranted I can give a better explanation of solution structure.

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• How can I make kml data in google earth look like google maps?

  - by celenius

  I have a program that generates a .shp file, and exports this as a kml file. I would like to be able to display my output using the standard google map 'map' style (gray background, yellow streets, etc) in google earth. Is there a style guide or method that I should be using? Any thoughts appreciated - I wasn't sure how to structure this question. Thank you.

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• Can Spotlight index a MacFUSE filesystem?

  - by tdavies

  Spotlight indexes at the file level, so a file containing a complicated data structure may need to be split into a set of files for Spotlight to index it in a useful way. Can you use MacFUSE to achieve this more dynamically? Will Spotlight index a MacFUSE volume? Can MacFUSE handle the necessary per-file metadata? Can a MacFUSE process notify Spotlight when attributes of a file change?

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• Load parent and child table in one query linq to entitiy

  - by parminder

  Hi Experts, I have a following tables/classes structure in Linq to entities. ` Books { bookId, Title } Tags { TagId Tag } BooksTags { BookId TagId } ' Now I need to write a query which gives me result like this Class Result { bookId, Title Tags } Tags should be comma separated text from the tags table by joining all three tables. How to get it done. Thanks Parminder

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• LINQ: Create persistable Associations in Code, Without Foreign Key

  - by Alex

  Hello, I know that I can create LINQ Associations without a Foreign Key. The problem is, I've been doing this by adding the [Association] attribute in the DBML file (same as through the designer), which will get erased again after I refresh my database (and reload the entire table structure). I know that there is the MyData.cs file (as part of the DBML) in which I can place my partial extensions etc. to domain objects (to persist even after I refresh the DBML), but I don't know how to create an association there?

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• How do I set default host for url helpers in rails?

  - by ja.kub.cz

  I would like to do something like this config.default_host = 'www.subdomain.example.com' in some of my configuration files, so that object_url helpers produce link beginning with http://www.subdomain.example.com I have tried to search the docs but I did not find anytnig exept ActionMailer docs and http://api.rubyonrails.org/classes/Rails/Configuration.html which is not usefull for me, because I do not know in which pat to look. Is there a place which describes the whole structure of Rails::Initializer.config? Thanks for helping Jakub

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• Remove certain filetypes in Python

  - by Gareth

  Hello. I am running a script that walks a directory structure and generates new files in each folder in the directory. I want to delete some of the files right after creation. This is my idea, but it is quite wrong I imagine: directory = os.path.dirname(obj) m = MeshExporterApplication(directory) os.remove(os.path.join(directory,"*.mesh.xml")) How to you put wildcards in a path? I guess not like /home/me/*.txt, but that is what I am trying. Thanks, Gareth

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• Checking if subfolders exist linux

  - by laura

  I'm trying to check if a folder has any subfolders without iterating through its children, in Linux. The closest I've found so far is using ftw and stopping at the first subfolder - or using scandir and filtering through the results. Both, are, however, an overkill for my purposes, I simply want a yes/no. On Windows, this is done by calling SHGetFileInfo and then testing dwAttributes & SFGAO_HASSUBFOLDER on the returned structure. Is there such an option on Linux?

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• Python Sets vs Lists

  - by mvid

  In Python, which data structure is more efficient/speedy? Assuming that order is not important to me and I would be checking for duplicates anyway, is a Python set slower than a Python list?

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• Kohonen SOM Maps in R Tutorial

  - by Btibert3

  Hi Everyone, I am simply looking for a good tutorial that will walk me through how to create a SOM in R. I am reading Kohonen and Kaski's paper on using the maps to identify the structure of Welfare, and want to try the technique my self. I think many of the examples in R have a lot to be desired. I have looked on the web and didn't find anything that I thought made the process easy to understand. Any help you can provide will be greatly appreciated.

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