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  • Resources to learn about engineering aspects of data analytics (OLAP, warehousing, ETL, etc.)

    - by JT
    I'm a math/stats guy, interested in learning more about the engineering aspects of "data analytics" (this may be an overly broad term, this is a case of "I don't know what I don't know", so I'm not sure how to be more specific). I'm fine with manipulating and analyzing the data once it's already stored somewhere and I can access it, and I'm fine with writing scripts and SQL queries (and have a general knowledge of things like normalization). What I don't know is the whole engineering process of capturing and storing the data. For example, terms I've heard thrown about that I only vaguely understand the meaning of include: - OLAP, OLTP - Data warehousing - ETL - ??? What's a good book (or any other resource) to learn about these kinds of things? What are things I should know about database design (normalization seems kinda "obvious" to me, something I would have done even before I knew the term -- is there anything else?)? In other words, for jobs falling under the umbrella term of "analytics engineer", what kinds of things should I know?

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  • error: 'QTabWidget::QTabWidget(const QTabWidget&)' is private

    - by Mahdi_Nine
    I develop a program and I have 10 backups of it. I added some lines to it and when I compiled the project and now it has the following error: C:\Qt\Qt5.0.1\5.0.1\mingw47_32\include\QtWidgets\qtabwidget.h:173: error: 'QTabWidget::QTabWidget(const QTabWidget&)' is private the error is from * line namespace Ui { class ContentControl; } class ContentControl : public QTabWidget // * from this line { Q_OBJECT public: . . . } All backups have this error now. Any idea why? I re-installed Qt but the problem is still present.

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  • How to obtain Bing maps like InfoWindow in Google Maps?

    - by BillB
    I'm using Google Maps v3. I really like the InfoWindows found in Bing, as opposed to Google. Screenshots & functionality found here comparing the two: http://www.axismaps.com/blog/2009/07/data-probing-and-info-window-design-on-web-based-maps/ Question: How can I replicate Bing like InfoWindows while using Google Maps v3? UPDATE: To be more specific, what I like about Bing's InfoWindows include: - The pointer dynamically changes sides from left/right/bottom/top, as opposed to Google limited to only have the InfoWindow pointer on the bottom - Bing's InfoWindows use less space - You can configure Bing's InfoWindows to pop up outside of the map bounders so that you don't have to autopan the map to display the marker's InfoWindow

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  • Implementing Dijkstra's Algorithm

    - by DeadMG
    I've been tasked (coursework @ university) to implement a form of path-finding. Now, in-spec, I could just implement a brute force, since there's a limit on the number of nodes to search (begin, two in the middle, end), but I want to re-use this code and came to implement Dijkstra's algorithm. I've seen the pseudo on Wikipedia and a friend wrote some for me as well, but it flat out doesn't make sense. The algorithm seems pretty simple and it's not a problem for me to understand it, but I just can't for the life of me visualize the code that would realize such a thing. Any suggestions/tips?

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  • Why does the data binding in this validation example work?

    - by MartyIX
    I'm wondering how exactly the XAML sample (MSDN sample) works: <Style x:Key="textBoxInError" TargetType="{x:Type TextBox}"> <Style.Triggers> <Trigger Property="Validation.HasError" Value="true"> <Setter Property="ToolTip" Value="{Binding RelativeSource={x:Static RelativeSource.Self}, Path=(Validation.Errors)[0].ErrorContent}"/> </Trigger> </Style.Triggers> </Style> Questions: (Validation.Errors)[0].ErrorContent - Is this code somehow checked by WPF? Because Validation.Errors may be an empty collection and in ordinary C# code this code may throw an exception. If this data-binding returns null for valid input - the null value is then casted to empty string (in a text control for example)? The index 0 corresponds to the first error message. How can I return more error messages from Validate method? Thank you for responses!

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  • Android webview cookie problem

    - by Tori
    I have a video link in a web view, on the emulator, I hear the audio and no video is displayed. I think this is an emulator issue. I tried on my Nexus One, when I click the link, it opens a new webview and tries to access the server almost immediately reverts back to the webview and does not show the video. Logcat says: WARN/ResponseProcessCookies(486): Cookie rejected: "BasicClientCookie[version=0,name=GX,domain=mail.google.com,path=/proxy/gmail/mail,expiry=Tue Mar 22 19:55:33 EDT 2011]". Illegal domain attribute "mail.google.com". Domain of origin: "android.clients.google.com" How can I fix this?

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  • mediawiki markup equivalent of WMD editor?

    - by Justin Grant
    Anyone have a recommendation for an editor like the WMD editor, but using MediaWiki markup instead of Markdown? Our site is already using MediaWiki markup but we want a slicker editor without changing markup completely. Requirements include: live preview of formatted text underneath the markup you're typing a toolbar for common formatting (bold, italic, links, bullets, numbered-list, code, etc) keyboard shortcuts for each toolbar button (e.g. CTRL+B for bold) Undo/redo via keyboard shortcuts (CTRL+Z/CTRL+Y) or toolbar buttons works well in the usual set of popular browsers (including IE6!) open-source would be preferred

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  • How to add ServiceReference to an embedded file?

    - by TruMan1
    I have a class library. In one of the classes, I am adding a script reference on the page like this: protected override void OnPreRender(EventArgs e) { base.OnPreRender(e); if (this.Page != null) { ScriptManager sm = ScriptManager.GetCurrent(this.Page); ServiceReference reference = new ServiceReference("~/Sitefinity/Admin/Services/ContactsService.asmx"); reference.InlineScript = true; sm.Services.Add(reference); } } For the ServiceReference file path, is there a way to add an embedded file instead? I want to keep everything self-contained in my class library instead of dropping a file into the website folder.

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  • First time unit testing (in silverlight)

    - by Jakob
    Hi I've searched some other posts, but most of them assumed that people knew what they were doing in their unit testing, and frankly I don't. I see the idea behind unit testing, and I'm coding an silverlight application much in the blind right now, and I'd like to write some unit tests to kind of be sure I'm on the right path. I'd like to be able to use the SL4 vs 2010 silverlight unit test project template, to keep it simple and not use external tools. So what I need an answer for are questions like: what are the methods of unit testing? what are the differences between unit tests, and automated unit tests? How do I meaningfully unit test in silverlight? What should I be aware of while unit testing (in silverlight) ? Also should I implement some kind of IRepository pattern in my silverlight app to make unit testing easier?

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  • Can I start my new Career as a web application developer over an age of 32

    - by Sami
    Greetings Guys.. Iam 32 years old, I graduated from university in 2005 but from that time I didnt work in my career as a developer,and I dont have any experience in that major. My current career is software testing, but actually iam not satisfied in that job since i dont see any future for it and i dont know its path (to where will I arrive). Now i decided to take extra cources in VB.net, asp.net since I want to change my career to become webdeveloper. But 1 thing that always desturb me is that I feel that time is passed iam iam too old to become web developer. Is my feeling true?? and are there any poeple who start programing at a late age and did the succeed?? Thanks

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  • SecurityException from Activator.CreateInstance(), How to grant permissons to Assembly?

    - by user365164
    I have been loading an assembly via Assembly.LoadFrom(@"path"); and then doing Type t = asm.GetType("Test.Test"); test = Activator.CreateInstance(t, new Object[] { ... }); and it was working fine, but now I moved the dll I am getting the following System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. --- System.Security.SecurityException: Request for the permission of type 'System.Security.Permissons.SecurityPermission, etc .. For the sake of brevity it seems the demand was for an PermissionSet that allowed ControlAppDomain and it's not getting it. My question is how can I create this permissionset and pass it to the instance or assembly? I've been googling for hours to no avail.

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  • "Could not find the main class: bla.bla.yada", although specified correctly in the MANIFEST.MF

    - by Bernhard V
    Hi, I'm trying to run a .jar file with the command "java -jar Filename.jar", but I am always getting an error saying "Could not find the main class: bla.bla.yada". I build the whole application with Maven and specified a Main-Class in the MANIFEST.MF. The path in the file is correct and the class also exists at the right location in the jar. The ending .class is omitted in the MANIFEST.MF. I hope this is correct. Do you have any other hints?

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  • Visual c++ opencv 2.1 contains()

    - by kaushalyjain
    how to check whether a given point is contained in a rectangle using the contains() function in Rect_ construct... Please give me the exact function and its parameters.Like when i type this Point b(2,2); Rect a(10,10,50,50); cout<< Rect_::contains(b); There is a compile error saying 1c:\users\kaushal\documents\visual studio 2008\projects\test1\test1.cpp(23) : error C2352: 'cv::Rect_<Tp::contains' : illegal call of non-static member function 1c:\opencv2.1\include\opencv\cxcore.hpp(385) : see declaration of 'cv::Rect<_Tp::contains'

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  • long integer problem

    - by hopefulLLl
    hello friends,, m a beginner at c language.. m using turbo c ++ compiler 16 bit. nw the max answer obtained by me is aaround 32000.. nw if i want a number larger that that then i use long int.. if i execute the following programme.. #include <stdio.h> void main() { long int x; x=40000; printf("%d", x); } then i get error that constant value is long in function main().. kindly tell me how to get an answer more that 32000 by getting rid of this error! thnx..

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  • My PowerShell functions do not appear to be registered

    - by Frank
    Hi there, I have a script saved in a ps1 file in which I define 2 functions as such: function Invoke-Sql([string]$query) { Invoke-Sqlcmd -ServerInstance $Server -Database $DB -User $User -Password $Password -Query $query } function Get-Queued { Invoke-Sql "Select * From Comment where AwaitsModeration = 1" } In the PowerShell console I then call the ps1 file by typing it in (it's in a folder in the path, and autocompletion works) However, I cannot start using the functions. I am confused, because when I copy / paste the functions into the console, all is fine and they work. I also have a function defined in my profile, and it works. Where am I thinking wrong, why doesn't it work what I'm trying to do?

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  • How to programmatically fill a database

    - by Dwaine Bailey
    Hi There, I currently have an iPhone app that reads data from an external XML file at start-up, and then writes this data to the database (it only reads/writes data that the user's app has not seen before, though) My concern is that there is going to be a back catalogue of data of several years, and that the first time the user runs the app it will have to read this in and be atrociously slow. Our proposed solution is to include this data "pre-built" into the applications database, so that it doesn't have to load in the archival data on first-load - that is already in the app when they purchase it. My question is whether there is a way to automatically populate this data with data from, say, an XML file or something. The database is in SQLite. I would populate it by hand, but obviously this will take a very long time, so I was just wondering if anybody had a more...programmatic solution...

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  • How to convert a C++ program that uses CUDA into MEX

    - by Harold Wellington Graves
    For work, I am converting the Image Denoising program that comes with the CUDA SDK into a MATLAB program. As far as I know, I have made all the necessary changes required by MATLAB, but when I try to call mex on it, MATLAB returns a bunch of linkage errors that I have no idea how to fix. If anyone has any suggestions on what I might be doing wrong, I would greatly appreciate it. The command I am giving MATLAB is: mex imageDenoisingGL.cpp -I..\..\common\inc -IC:\CUDA\include -L..\..\common\lib -lglut32 And the output from MATLAB is a bunch of these: imageDenoisingGL.obj : error LNK2019: unresolved external symbol __imp__cutCheckCmdLineFlag@12 referenced in function "void __cdecl __cutilExit(int,char * *)" (?__cutilExit@@YAXHPAPAD@Z) I am running: Windows XP x32 Visual Studio 2005 MATLAB 2007a

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  • Running a program in another one?

    - by Roman
    Hi, I've written a program in C++. It's just using the console to have it as portable as possible. Unfortunately, many Windows-Users seem not to understand how to use the program (Linux Users are just fine with it :) ). So I'd like to write a GUI for that program. As this needs to run on Windows only, I'd like to write it in C#. But I want to maintain the GUI apart from the original program. So basically, I need a way to include a compiled *.exe into another program. Is there a way to catch the console output from another program and send inputs to it? Also, can the console of the original program be hidden? Similar Questions How To: Execute command line in C#, get STD OUT results

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  • New NCover 3.4.2 makes all my MSTest unit tests fail

    - by Steven
    Yesterday, I decided to install the newest NCover version (3.4.2). However, when I ran it on my existing .ncover configuration file, the NCover output suddenly reported that all my MSTest tests failed. Of course those tests succeed when ran within Visual Studio. Because of this, NCover isn't able to determine any coverage. Somehow the old configuration doesn't seem to work with the new version. Does anyone have any idea what the problem could be or how to solve it? Btw. Here is my ncover configuration. Project settings: Path to application to profile: c:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\MSTest.exe Arguments for the application to profile: /testcontainer:D:\dev\MyApp\MyApp.Services.Tests.Unit\bin\Debug\MyApp.Services.Tests.Unit.dll /testcontainer:D:\dev\MyApp\MyApp.WS.Tests.Unit\bin\Debug\MyApp.WS.Tests.Unit.dll Working folder: D:\dev\MyApp

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  • MinGW and "delcaration does not declare anything"

    - by Bob Somers
    I'm working on converting a Linux project of mine to compile on Windows using MinGW. It compiles and runs just fine on Linux, but when I attempt to compile it with MinGW it bombs out with the following error message: camera.h:11: error: declaration does not declare anything camera.h:12: error: declaration does not declare anything I'm kind of baffled why this is happening, because I'm using the same version of g++ (4.4) on both Linux and Windows (via MinGW). The contents of camera.h is absurdly simple. Here's the code. It's choking on lines 11 and 12 where float near; and float far; are defined. #include "Vector.h" #ifndef _CAMERA_H_ #define _CAMERA_H_ class Camera{ public: Vector eye; Vector lookAt; float fov; float near; float far; }; #endif Thanks for your help.

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  • preg_match problem

    - by Biroka
    I'm trying to get some stuff from a string in php. In RegexBuddy and Regular expression tester (firefox addon) it works good, but php gives me the following: Warning: preg_match() [function.preg-match]: Compilation failed: unmatched parentheses at offset 34 in D:\path\example.php on line 62 my pattern is "/.{4}_tmp\\([A-Za-z0-9.\\]*)\(([0-9]*)\) : (.*)/i" an example string: C:\Temp\browseide\projects\32\821C_tmp\SourceFiles\main.c(8) : error C2143: syntax error : missing ';' before 'for' what RegexBuddy gets: 821C_tmp\SourceFiles\main.c(8) : error C2143: syntax error : missing ';' before 'for' Group 1: SourceFiles\main.c Group 2: 8 Group 3: error C2143: syntax error : missing ';' before 'for'

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  • Why am I getting "Enter Parameter Value" when running my MS Access query?

    - by DanM
    In my query, I use the IIF function to assign either "Before" or "After" to a field named BeforeOrAfter using AS. When I run this query, however, the "Enter Parameter Value" dialog appears, requesting a value for BeforeOrAfter. If I remove BeforeOrAfter DESC from the ORDER BY clause, I don't get the dialog. Here is the offending query: SELECT d.Scenario, e.Event, IIF(d.LogTime < e.Time, 'Before','After') AS BeforeOrAfter, d.HeartRate FROM Data d INNER JOIN Events e ON d.Scenario = e.Scenario WHERE e.Include = Yes ORDER BY d.Scenario, e.Id, BeforeOrAfter DESC Question: Why is my AS BeforeOrAfter not being recognized by the ORDER BY clause? Why does it ask me to enter a parameter value for "BeforeOrAfter" when I run this query? Note: I tried using brackets, single quotes, double quotes, etc., but none of that made any difference.

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  • Use HTTParty methods in a subclass

    - by cpjolicoeur
    I'm trying to write an API wrapper in ruby and am stumped on how I can call HTTParty methods from a subclass. For instance, I want the user to create a connection to the api and then be able to query results from subclasses. module ApiWrapper class Connection include HTTParty base_uri '...' def initialize( u, p ) ... end def contacts ApiWrapper::Contact end end end module ApiWrapper class Contact def all # issue httparty get request here that is created from the Connection class end end end ## The user would do this conn = ApiWrapper::Connection.new( 'username', 'password' ) contacts = conn.contacts.all

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  • Operant conditioning algorithm?

    - by Ken
    What's the best way to implement real time operant conditioning (supervised reward/punishment-based learning) for an agent? Should I use a neural network (and what type)? Or something else? I want the agent to be able to be trained to follow commands like a dog. The commands would be in the form of gestures on a touchscreen. I want the agent to be able to be trained to follow a path (in continuous 2D space), make behavioral changes on command (modeled by FSM state transitions), and perform sequences of actions. The agent would be in a simulated physical environment.

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