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  • My Hard Drive isn't Working

    - by MeCB
    I never use Safely Remove Hardware with Windows XP. It has been working for me for years with my SD card, mouse, hard drive and memory stick. My hard drive has a USB cable and power cord so I can hook it up to any desktop hard drive. Now my hard drives don't like this and I did not know this till now. I am always careful and to wait till it is all finish accessing the USB before I unplug it. Now three of my hard drives can't be seen by Windows, though the others still work. when I hook it up to another computer it works fine. I use the same USB cable to hook up all of my hard drives one at a time. So my USB cable is good. I think that when I unplugged the hard drive this one time, it had a file it still wanted to see and now only this drive does not work only this computer. Then the same thing happens to my other two hard drive after I used it for a week with the same cables. How can I fix this?

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  • dotnet Cologne 2010

    - by WeigeltRo
    Am 28.5 findet in Köln die dotnet Cologne 2010 statt, eine von der .NET User Group Köln und der von mir geleiteten Gruppe Bonn-to-Code.Net gemeinsam organisierten Konferenz zum Launch von Visual Studio 2010 und .NET Framework 4. Die Registrierung ist seit Anfang März möglich, und obwohl es bisher kaum konkrete Details zu den Sprechern und Vorträgen gab, haben sich bereits über 250 Teilnehmer angemeldet. Das zeugt von hervorragender Mund-zu-Mund-Propaganda, nicht zuletzt ein klares Zeichen für den Erfolg der letztjährigen dotnet Cologne 2009. Hinter den Kulissen brach ein wahrer Sturm von Vortragsvorschlägen über das Orga-Team (bestehend aus Stefan Lange, Albert Weinert und mir) herein. In mehreren Runden versuchten wir, die richtige Mischung zwischen einführenden und tiefgehenden Themen zu finden. Dabei wurde schnell klar, dass wir nicht mit den ursprünglich geplanten drei Tracks auskommen würden. Deshalb haben wir nach reiflicher Überlegung einen vierten Track eingerichtet, darüber hinaus bieten wir - nach dem Vorbild anderer Konferenzen - dieses Jahr auch Lunch-Sessions an. Seit heute steht nun ein Großteil der Vorträge offiziell fest, nur noch einige wenige Slots sind noch frei. Wer bisher mit der Anmeldung gezögert hat, sollte schnell einen Blick hineinwerfen und sich entscheiden. Denn ab einer der Marke von 300 Teilnehmern wird eine Warteliste eingerichtet. Zwar werden erfahrungsgemäß später einige Plätze wieder frei, aber wer ganz sicher einen Platz bei der dotnet Cologne 2010 haben möchte, sollte sich bald anmelden. Denn: Ein ganzer Tag vollgepackt mit Informationen, viele bekannte Namen der deutschen .NET-Community nicht nur auf der Sprecherliste-, sondern auch unter den Teilnehmern – und am Abend dann noch die Grillfete des dotnet Forum. Wer da nicht dabei ist, der wird wird echt etwas verpassen…

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  • Flashback Data Archives: Ein gutes Gedächtnis für DBA und Entwickler

    - by Heinz-Wilhelm Fabry (DBA Community)
    Daten werden gespeichert und zum Teil lange aufbewahrt. Mitunter werden Daten nach ihrer ersten Speicherung geändert, vielleicht sogar mehrfach. Je nach gesetzlicher oder betrieblicher Vorgabe müssen die Veränderungen sogar nachverfolgbar sein. Damit sind zugleich Mechanismen gefordert, die sicherstellen, dass die Folge der Versionen lückenlos ist. Und implizit bedeutet das zusätzlich, dass die Versionen auch vor Löschen und Verändern geschützt sein müssen. Das Versionieren kann über die Anwendung, mit der die Daten auch erfasst werden, erfolgen, über Trigger oder über besondere Werkzeuge. Jede dieser Lösungen hat ihre eigenen Schwächen. Zusätzlich steht die Frage nach dem Schutz vor unerlaubtem Löschen oder Ändern versionierter Daten im Raum. Flashback Data Archives lösen diese Frage, denn sie bieten nicht nur einen wirksamen Mechanismus zum Versionieren von Datensätzen, sondern sie schützen diese Versionen auch vor Veränderung und löschen sie schließlich sogar automatisch nach Ablauf ihrer Aufbewahrungsfrist.Ursprünglich wurden die Archive als eigenständige Option zur Enterprise Edition der Oracle Database 11g unter dem Namen Total Recall eingeführt. Ende Juni 2012 verloren die Flashback Data Archives ihren Status als eigenständige Option. Weil die Archive aber grundsätzlich komprimiert wurden, hat Oracle sie stattdessen zu einem Feature der Advanced Compression Option der Enterprise Edition (ACO) gemacht. Seit der Version 11.2.0.4 der Datenbank ist das Komprimieren aber für die Archive nicht mehr zwangsläufig, sondern optional. Damit gibt es lizenzrechtlich erneut eine Änderung: Wer die Kompression verwendet, der muss nach wie vor ACO lizensieren. Wer die Flashback Data Archives dagegen ohne Kompression verwendet - also zum Beispiel Entwickler -, dem stehen sie ab 11.2.0.4 aufwärts im Lieferumfang aller Editionen der Datenbank zur Verfügung. Diese Änderung ist in den Handbüchern zur Lizensierung der Versionen 11.2 und 12.1 der Datenbank dokumentiert. Im Rahmen der DBA Community ist bereits über die Flashback Data Archives berichtet worden. Der hier vorliegende Artikel ersetzt alle vorangegangenen Beiträge zum Thema.

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  • Daten versionieren mit Oracle Database Workspace Manager

    - by Heinz-Wilhelm Fabry (DBA Community)
    Wie können extrem lange Transaktionen durchgeführt werden, also Transaktionen, die Datensätze über Stunden oder Tage exklusiv sperren, ohne dass diese langen Transaktionen 'normale' Transaktionen auf diesen Datensätzen behindern? Solche langen Transakionen sind zum Beispiel im Spatial Umfeld keine Seltenheit. Wie können unterschiedliche historische Zustände von Produktionsdaten online zeitlich unbegrenzt vorgehalten werden? Die UNDO Daten, die das gesamte Änderungsvolumen einer Datenbank vorhalten, gewährleisten in der Regel nur einen zeitlich sehr limitierten Zugriff auf 'ältere' Daten. Und die Technologie der database archives, auch bekannt unter dem Namen Total Recall, erlaubt einerseits keine Änderungen an den älteren Daten und steht andererseits ausschließlich in der Enterprise Edition der Datenbank zur Verfügung. Wie kann man die aktuellsten Produktionsdaten für WHAT-IF-Analysen verändern und währenddessen andere Benutzer ungestört auf den Originaldaten weiterarbeiten lassen? Ein SET TRANSACTION READ ONLY erlaubt keinerlei Änderungen und ist ebenfalls begrenzt auf die 'Reichweite' der UNDO Informationen. Zwar könnte man für derartige Analysen eine Datenbankkopie aus dem Backup aufbauen oder eine Standby Lösung implementieren, aber das ist doch eher aufwändig. Es gibt eine verblüffend einfache Antwort auf diese scheinbar komplizierten Fragen. Sie heisst Oracle Database Workspace Manager oder kurz Workspace Manager (WM). Der WM ist ein Feature der Datenbank seit Oracle9i, das sowohl in der Standard als auch in der Enterprise Edition zur Verfügung steht. Anders als in den ersten Versionen ist er längst auch Bestandteil jeder Installation. Um so erstaunlicher ist es, dass so wenige Kunden ihn kennen. Dieser Tipp soll dazu beitragen, das zu ändern.

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  • Daten-Fluthelfer

    - by A&C Redaktion
    „Schneller entscheiden als der Wettbewerb", so heißt der neue Sales Guide zum Thema Business Intelligence für Oracle Partner. Unter diesem Motto gibt die Broschüre auf nur zwölf Seiten einen soliden Überblick, wie man die ungeheuren Datenmengen, mit denen Unternehmen tagtäglich zu kämpfen haben, effizient analysieren und nutzen kann. Alles fängt bekanntlich ganz harmlos an: Langsam und fast unbemerkt steigen die Datenmengen, bis sie plötzlich zum schier unlösbaren Problem werden - und das auf mehreren Ebenen: Die Endanwender sind unzufrieden über lange Ladeprozesse, die Datenqualität und die Abfrageperformance Die Betriebskosten steigen mit dem erhöhten Administrations- und Wartungsaufwand Die Entwicklungsproduktivität ist gering, denn der manuelle Aufwand für Datenbereinigung und -strukturierung ist hoch und die Anbindung neuer Datenquellen zunehmend kompliziert Irgendwann ist es an der Zeit für eine Gesamt-Architektur, die die Zentralisierung von BI- und Warehouse-Komponenten ermöglicht. Der Sales Guide zeigt Lösungen auf, für die sich verschiedene große Unternehmen entschieden haben, darunter ein internationaler Finanzdienstleister und eine der größten Online-Auktionsplattformen. Der Sales Guide behandelt nicht nur die Probleme rund um das Datawarehousing, sondern bietet wie immer auch eine Handreichung zur Ermittlung des Kundebedarfs und zum vertrieblichen Vorgehen. Hier geht's zum Download (nur mit OPN-Passwort): Sales Guide BI und Datawarehouse Mit dem Dauerthema Business Intelligence setzen sich auch die Oracle Solutions Partner Communities auseinander.

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  • SQL SERVER – Disable Clustered Index and Data Insert

    - by pinaldave
    Earlier today I received following email. “Dear Pinal, [Removed unrelated content] We looked at your script and found out that in your script of disabling indexes, you have only included non-clustered index during the bulk insert and missed to disabled all the clustered index. Our DBA[name removed] has changed your script a bit and included all the clustered indexes. Since our application is not working. When DBA [name removed] tried to enable clustered indexes again he is facing error incorrect syntax error. We are in deep problem [word replaced] [Removed Identity of organization and few unrelated stuff ]“ I have replied to my client and helped them fixed the problem. What really came to my attention is the concept of disabling clustered index. Let us try to learn a lesson from this experience. In this case, there was no need to disable clustered index at all. I had done necessary work when I was called in to work on tuning project. I had removed unused indexes, created few optimal indexes and wrote a script to disable few selected high cost indexes when bulk insert (and similar) operations are performed. There was another script which rebuild all the indexes as well. The solution worked till they included clustered index in disabling the script. Clustered indexes are in fact original table (or heap) physically ordered (any more things – not scope of this article) according to one or more keys(columns). When clustered index is disabled data rows of the disabled clustered index cannot be accessed. This means there will be no insert possible. When non clustered indexes are disabled all the data related to physically deleted but the definition of the index is kept in the system. Due to the same reason even reorganization of the index is not possible till the clustered index (which was disabled) is rebuild. Now let us come to the second part of the question, regarding receiving the error when clustered index is ‘enabled’. This is very common question I receive on the blog. (The following statement is written keeping the syntax of T-SQL in mind) Clustered indexes can be disabled but can not be enabled, they have to rebuild. It is intuitive to think that something which we have ‘disabled’ can be ‘enabled’ but the syntax for the same is ‘rebuild’. This issue has been explained here: SQL SERVER – How to Enable Index – How to Disable Index – Incorrect syntax near ‘ENABLE’. Let us go over this example where inserting the data is not possible when clustered index is disabled. USE AdventureWorks GO -- Create Table CREATE TABLE [dbo].[TableName]( [ID] [int] NOT NULL, [FirstCol] [varchar](50) NULL, CONSTRAINT [PK_TableName] PRIMARY KEY CLUSTERED ([ID] ASC) ) GO -- Create Nonclustered Index CREATE UNIQUE NONCLUSTERED INDEX [IX_NonClustered_TableName] ON [dbo].[TableName] ([FirstCol] ASC) GO -- Populate Table INSERT INTO [dbo].[TableName] SELECT 1, 'First' UNION ALL SELECT 2, 'Second' UNION ALL SELECT 3, 'Third' GO -- Disable Nonclustered Index ALTER INDEX [IX_NonClustered_TableName] ON [dbo].[TableName] DISABLE GO -- Insert Data should work fine INSERT INTO [dbo].[TableName] SELECT 4, 'Fourth' UNION ALL SELECT 5, 'Fifth' GO -- Disable Clustered Index ALTER INDEX [PK_TableName] ON [dbo].[TableName] DISABLE GO -- Insert Data will fail INSERT INTO [dbo].[TableName] SELECT 6, 'Sixth' UNION ALL SELECT 7, 'Seventh' GO /* Error: Msg 8655, Level 16, State 1, Line 1 The query processor is unable to produce a plan because the index 'PK_TableName' on table or view 'TableName' is disabled. */ -- Reorganizing Index will also throw an error ALTER INDEX [PK_TableName] ON [dbo].[TableName] REORGANIZE GO /* Error: Msg 1973, Level 16, State 1, Line 1 Cannot perform the specified operation on disabled index 'PK_TableName' on table 'dbo.TableName'. */ -- Rebuliding should work fine ALTER INDEX [PK_TableName] ON [dbo].[TableName] REBUILD GO -- Insert Data should work fine INSERT INTO [dbo].[TableName] SELECT 6, 'Sixth' UNION ALL SELECT 7, 'Seventh' GO -- Clean Up DROP TABLE [dbo].[TableName] GO I hope this example is clear enough. There were few additional posts I had written years ago, I am listing them here. SQL SERVER – Enable and Disable Index Non Clustered Indexes Using T-SQL SQL SERVER – Enabling Clustered and Non-Clustered Indexes – Interesting Fact Reference : Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, SQL, SQL Authority, SQL Constraint and Keys, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • How to recover after embarrassing yourself and your company?

    - by gaearon
    I work in an outsourcing company in Russia, and one of our clients is a financial company located in USA. For the last six months I have been working on several projects for this particular company, and as I was being assigned a larger project, I was invited to work onsite in USA in order to understand and learn the new system. Things didn't work out as well as I hoped because the environment was messy after original developers, and I had to spent quite some time to understand the quirks. However we managed to do the release several days ago, and it looks like everything's going pretty smooth. From technical perspective, my client seems to be happy with me. My solutions seem to work, and I always try to add some spark of creativity to what I do. However I'm very disorganized in a certain sense, as I believe many of you fellas are. Let me note that my current job is my first job ever, and I was lucky enough to get a job with flexible schedule, meaning I can come in and out of the office whenever I want as long as I have 40 hours a week filled. Sometimes I want to hang out with friends in the evening, and days after that I like to have a good sleep in the morning—this is why flexible schedule (or lack of one) is ideal fit for me. [I just realized this paragraph looks too serious, I should've decorated it with some UNICORNS!] Of course, after coming to the USA, things changed. This is not some software company with special treatment for the nerdy ones. Here you have to get up at 7:30 AM to get to the office by 9 AM and then sit through till 5 PM. Personally, I hate waking up in the morning, not to say my productivity begins to climb no sooner than at 5 o'clock, i.e. I'm very slow until I have to go, which is ironic. Sometimes I even stay for more than 8 hours just to finish my current stuff without interruptions. Anyway, I could deal with that. After all, they are paying for my trip, who am I to complain? They need me to be in their working hours to be able to discuss stuff. It makes perfect sense that fixed schedule doesn't make any sense for me. But it does makes sense that it does make sense for my client. And I am here for client, therefore sense is transferred. Awww, you got it. I was asked several times to come exactly at 9 AM but out of laziness and arrogance I didn't take these requests seriously enough. This paid off in the end—on my last day I woke up 10 minutes before final status meeting with business owner, having overslept previous day as well. Of course this made several people mad, including my client, as I ignored his direct request to come in time for two days in the row, including my final day. Of course, I didn't do it deliberately but certainly I could've ensured that I have at least two alarms to wake me up, et cetera...I didn't do that. He also emailed my boss, calling my behavior ridiculous and embarrassing for my company and saying “he's not happy with my professionalism at all”. My boss told me that “the system must work both in and out” and suggested me to stay till late night this day working in a berserker mode, fixing as many issues as possible, and sending a status email to my client. So I did, but I didn't receive the response yet. These are my questions to the great programmers community: Did you have situations where your ignorance and personal non-technical faults created problems for your company? Were you able to make up for your fault and stay in a good relationship with your client or boss? How? How would you act if you were in my situation?

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  • C# Collision test of a ship and asteriod, angle confusion

    - by Cherry
    We are trying to to do a collision detection for the ship and asteroid. If success than it should detect the collision before N turns. However it is confused between angle 350 and 15 and it is not really working. Sometimes it is moving but sometime it is not moving at all. On the other hand, it is not shooting at the right time as well. I just want to ask how to make the collision detection working??? And how to solve the angle confusion problem? // Get velocities of asteroid Console.WriteLine("lol"); // IF equation is between -2 and -3 if (equation1a <= -2) { // Calculate no. turns till asteroid hits float turns_till_hit = dx / vx; // Calculate angle of asteroid float asteroid_angle_rad = (float)Math.Atan(Math.Abs(dy / dx)); float asteroid_angle_deg = (float)(asteroid_angle_rad * 180 / Math.PI); float asteroid_angle = 0; // Calculate angle if asteroid is in certain positions if (asteroid.Y > ship.Y && asteroid.X > ship.X) { asteroid_angle = asteroid_angle_deg; } else if (asteroid.Y < ship.Y && asteroid.X > ship.X) { asteroid_angle = (360 - asteroid_angle_deg); } else if (asteroid.Y < ship.Y && asteroid.X < ship.X) { asteroid_angle = (180 + asteroid_angle_deg); } else if (asteroid.Y > ship.Y && asteroid.X < ship.X) { asteroid_angle = (180 - asteroid_angle_deg); } // IF turns till asteroid hits are less than 35 if (turns_till_hit < 50) { float angle_between = 0; // Calculate angle between if asteroid is in certain positions if (asteroid.Y > ship.Y && asteroid.X > ship.X) { angle_between = ship_angle - asteroid_angle; } else if (asteroid.Y < ship.Y && asteroid.X > ship.X) { angle_between = (360 - Math.Abs(ship_angle - asteroid_angle)); } else if (asteroid.Y < ship.Y && asteroid.X < ship.X) { angle_between = ship_angle - asteroid_angle; } else if (asteroid.Y > ship.Y && asteroid.X < ship.X) { angle_between = ship_angle - asteroid_angle; } // If angle less than 0, add 360 if (angle_between < 0) { //angle_between %= 360; angle_between = Math.Abs(angle_between); } // Calculate no. of turns to face asteroid float turns_to_face = angle_between / 25; if (turns_to_face < turns_till_hit) { float ship_angle_left = ShipAngle(ship_angle, "leftKey", 1); float ship_angle_right = ShipAngle(ship_angle, "rightKey", 1); float angle_between_left = Math.Abs(ship_angle_left - asteroid_angle); float angle_between_right = Math.Abs(ship_angle_right - asteroid_angle); if (angle_between_left < angle_between_right) { leftKey = true; } else if (angle_between_right < angle_between_left) { rightKey = true; } } if (angle_between > 0 && angle_between < 25) { spaceKey = true; } } }

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  • Easy to use AutoHotkey/AutoIT alternatives for Linux

    - by Xeddy
    Hi all, I'm looking for recommendations for an easy-to-use GUI automation/macro platform for Linux. If you're familiar with AutoHotkey or AutoIT on Windows, then you know exactly the kind of features I need, with the level of complexity. If you aren't familiar, then here's a small code snippet of how easy it is to use AHK: InputBox, varInput, Please enter some random text... Run, notepad.exe WinWaitActive, Untitled - Notepad SendInput, %varInput% SendInput, !f{Up}{Enter}{Enter} WinWaitActive, Save SendInput, SomeRandomFile{Enter} MsgBox, Your text`, %varInput% has been saved using notepad! #n::Run, notepad.exe Now the above example, although a bit pointless, is a demo of the sort of functionality and simplicity I'm looking for. Here's an explanation for those who don't speak AHK: ----Start of Explanation of Code ---- Asks user to input some text and stores it in varInput Runs notepad.exe Waits till window exists and is active Sends the contents of varInput as a series of keystrokes Sends keystrokes to go to File - Exit Waits till the "Save" window is active Sends some more keystrokes Shows a Message Box with some text and the contents of a variable Registers a hotkey, Win+N, which when pressed executes notepad.exe ----End of Explanation---- So as you can understand, the features are quite obvious: Ability to easily simulate keyboard and mouse functions, read input, process and display output, execute programs, manipulate windows, register hotkeys, etc.. all being done without requiring any #includes, unnecessary brackets, class declarations etc. In short: Simple. Now I've played around a bit with Perl and Python, but its definitely no AHK. They're great for more advanced stuff, but surely, there has to be some tool out there for easy GUI automation? PS: I've already tried running AHK with Wine but sending keystrokes and hotkeys don't work.

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  • Algorithms for finding a numerical record in a list of ordered numbers

    - by Ankur
    I have a list of incomplete ordered numbers. I want to find a particular number with as few steps as possible. Are there any improvements on this algorithm, I assume you can count the set size without difficulty - it will be stored and updated every time a new item is added. Your object is to get your cursor over the value x The first number (smallest) is s, and the last number (greatest) is g. Take the midpoint m1 of the set: calculate is x < m1, If yes then s <= x < m1 If no then m1 < x <= g If m1 = x then you're done. Keep repeating till you find x. Basically dividing the set into two parts with each iteration till you hit x. The purpose is to retrieve a numerical id from a very large table to then find the associated other records. I would imagine this is the most trivial kind of indexing available, are there improvements?

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  • Browser freeze while ajax call in action

    - by kaivalya
    I have a ASP.NET Web App. I notice that while a simple ajax call(see below) is in process, web application does not respond to any action that I try on a different browser. $.ajax({ type: "GET", async: true, url: "someurl", dataType: "text", cache: false, success: function(msg){ CheckResponse(msg); } }); This happens when I open two firefox or two IE. I run the function that does the ajax call on first browser and till the response of the ajax is returned, I cannot do anything on the second browser on the same site. No breakpoints are hit on the server from the second browser till initial ajax is completed. It hangs for any click etc.. The hang on the second browser ends immediately after the ajax call is completed on the first one. This behavior is not observed if I try the same on IE and Firefox side by side. Only happen with IE & IE or FF & FF side by side Appreciate if you can help me see what I am missing here.

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  • Load Spikes on a Apache MySQL Server with Wordpress MU

    - by Vikram Goyal
    Hi there, I am trying to investigate the reasons for some mysterious load spikes on a Linux Apache server (2.2.14) running PHP 5.2.9 on a dedicated server with enough processing power and memory. My primary web application is a Wordpress MU (2.9.2) installation. I have investigated and ruled out DOS attack, MySQL or Apache configuration issues. The log files don't give me anything of interest, except to tell me that there is severe load. The load (which can go up to 100) just seems to come and go. It helps that I have a script that checks every 3 minutes for the load, and restarts Apache. Restarting it helps, and the server comes back, till it happens again. There seems to be no set time frame, or visitor numbers on the site that can trigger this. Even a low number of concurrent visitors (20) can trigger it. I am almost convinced that there is a rewrite loop somewhere that is causing Apache to go mad. Apache is trying to serve something that is causing it to spawn more and more processes till it keels over. My question is: Given that I am convinced that this is a rewrite issue or something similar, how can I try and figure out what the issue is? What should I monitor? Apache logs are voluminous, and not very helpful. Of course, if this is not the issue, then at least knowing what to look for will help me eliminate this as an issue and look for something else. Thanks! Vikram

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  • How to do timer with Nios II assembly?

    - by Nick Rosencrantz
    I've got an assignment in a computer engineering course that I don't fully understand since it is so large. Anyway I started coding the parts of it and it seems we should make code for some sort of timer. I've started put together the subroutine for snaptime but I'm not sure what I want: .equ timer, 0x920 .global snaptime .text .align 2 snaptime: movia r8,timer # basadressen till timern stw r0,12(r8) # sparar 0 till snapl movi r9,0b0110 # spara 6 i r9 stw r9,16(r8) # spara r9 movi ... ? andi r10,r10,0xFFFF The manual for Nios II assembly is here and the C code for what I'm trying to do is: #define TIMER_1_BASE ((volatile unsigned int*) 0x920) int snaptime (void) { int snaphight; int snaplow; int snap; TIMER_1_BASE[4]=0; snaphigh = TIMER_1_BASE[5] & 0xffffff; snaplow = TIMER_1_BASE[4] & 0xffffff; snap = snaphigh*65536+snaplow; return (snap); } Perhaps you can inspect the C which should be properly defined and see how I make it with assembly since the spec says it should be assembly.

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  • Can this be done using LINQ/Lambda, C#3.0

    - by Newbie
    Objective: Generate dates based on Week Numbers Input: StartDate, WeekNumber Output: List of dates from the Week number specified till the StartDate i.e. If startdate is 23rd April, 2010 and the week number is 1, then the program should return the dates from 16th April, 2010 till the startddate. The function public List<DateTime> GetDates(DateTime startDate,int weeks) { List<DateTime> dt = new List<DateTime>(); int days = weeks * 7; DateTime endDate = startDate.AddDays(-days); TimeSpan ts = startDate.Subtract(endDate); for (int i = 0; i <= ts.Days; i++) { DateTime dt1 = endDate.AddDays(i); dt.Add(dt1); } return dt; } I am calling this function as DateTime StartDate = DateTime.ParseExact("20100423", "yyyyMMdd", System.Globalization.CultureInfo.InvariantCulture); List<DateTime> dtList = GetDates(StartDate, 1); The program is working fine. Question is using C# 3.0 feature like Linq, Lambda etc. can I rewrite the program. Why? Because I am learning linq and lambda and want to implement the same. But as of now the knowledge is not sufficient to do the same by myself. Thanks.

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  • Partitioning data set in r based on multiple classes of observations

    - by Danny
    I'm trying to partition a data set that I have in R, 2/3 for training and 1/3 for testing. I have one classification variable, and seven numerical variables. Each observation is classified as either A, B, C, or D. For simplicity's sake, let's say that the classification variable, cl, is A for the first 100 observations, B for observations 101 to 200, C till 300, and D till 400. I'm trying to get a partition that has 2/3 of the observations for each of A, B, C, and D (as opposed to simply getting 2/3 of the observations for the entire data set since it will likely not have equal amounts of each classification). When I try to sample from a subset of the data, such as sample(subset(data, cl=='A')), the columns are reordered instead of the rows. To summarize, my goal is to have 67 random observations from each of A, B, C, and D as my training data, and store the remaining 33 observations for each of A, B, C, and D as testing data. I have found a very similar question to mine, but it did not factor in multiple variables. I feel silly asking this question because it seems so simple, but I'm stumped. Also, this is my first question on this site, so I apologize in advance for any faux pas on my part.

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  • How do I become better in math, after being a programmer for several years.

    - by loxs
    I've had quite a weird career till now. First I graduated from a medical school. Then I went into marketing (pharmaceuticals). And then umm, after some time, I decided to go for my (till then) hobby and became a "professional" programmer. I've been quite successful at this ever since. I have quite some languages "under my belt". I earn not bad and I have been involved in the opensource community quite heavily. The thing is that I suck at math :). Well, not totally of course, as I get my work done. But I don't know how much I suck. And I don't know how to find out. Math has never really been of any priority during my middle/high school years. I only picked as little as I could afford, because I was always getting ready to go for Medicine. Of course I know the basics of algebra. Things like "normal" and square equations. Also the basics of geometry. But well, there are things that I have missed. And lately I am being fascinated by things like probability theory, infinity, chaos/order etc. But every time I try to learn something about these topics, I hit a wall of terminology, special symbols, and some special kind of thinking, that is quite like mine (a programmer), but also a lot different (and appears weird to me). So, what kinds of books would you recommend me? It's very hard to find something suitable. All that I find are either too easy (and boring) or totally impenetrable.

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  • Error or not and insert to database mysql

    - by Azzyh
    Why wont this work? <?php include "top.php"; include "connect.php"; if(isset($_POST["submit"])) { $error = ""; if(empty($_POST["name"])) { $error .= "Du glömde märket!<br>"; if(empty($_POST["rating"])){ $error .= "Du glömde att bedömma märket!<br>"; if(empty($_POST["worth"])){ $error .= "Du glömde att välja vilken klass den hör till!<br>"; if(empty($_POST["username"])){ $error .= "Du glömde att skriva ditt namn!<br>"; if(empty($_POST["rating"])){ $error .= "Du glömde att skriva någonting?!!<br>"; }}}}} if(!empty($error)){ echo $error; }else{ $name = $_POST["name"]; $rating = $_POST["rating"]; $worth = $_POST["worth"]; $favorite = $_POST["favorite"]; $username = $_POST["username"]; $description = $_POST["description"]; mysql_query("INSERT INTO brands (name, rating, worth, favorite, username, description) VALUES ('$name', '$rating', '$worth', '$favorite', '$username', '$description')"); echo "<span style='color: green'>Yir yir, <a href='brand.php'>klicka här för att gå till Märken.</a></span>"; } } It doesnt come with errors it just say the succeed message like it has inserted to database

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  • How do I do a count on that meet a specific condition, dependent on several has_many relationships i

    - by Angela
    I have a Model Campaign. A Campaign has many Events. Each Event has an attribute :days. A Campaign also has_many Contacts. Each Contact as a :date_entered attribute. The from_today(contact,event) method returns a number, which is the number of days from the contact's :date_entered till today minus the event's :days. In other words, a positive number shows the number of days from today till the :days of the event is elapsed. If it is negative, if means that the number of days that has elapsed since the :date_entered is greater than the :days attribute of an event. In other words, the event is overdue. What I would like to be able to do is do campaign.overdue and this would result in a total number of contacts that have an overdue event. It shouldn't count multiple events for a single contact, just one contact. How do I do that? It seems like I would need to cycle through all the events for every contact and keep a counter but I'm assuming that there is a better way.

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  • when I am executing webdriver scripts from command prompt I get error "could not find or load main class

    - by Rahul Belhekar
    I want to run below java file from command prompt. whenever I am running it from command line it gives error "Error:Could not find or load main class".This is regular java code.It runs well in eclipse but gives this error in command prompt.I have set classpath till my project bin also set "path" till bin folder of jdk, this file is getting compiled but not running from command prompt.please help me to resolve my issue.Waiting for your reply thank you public class RILookBookGetTheLook extends Libraryfile { public static void main(String[] args) { //Delcaring objects //String className = this.getClass().getName(); WebDriver driver; String baseUrl; final Log LOG = LogFactory.getLog(BrowserLocator.class); CsvWriter out; try { setUp(); } catch (Exception e1) { // TODO Auto-generated catch block e1.printStackTrace(); } try { Display_ProductPage(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } try { tearDown(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } I have written methods here which I called from main method Please guys help me to solve this problem

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  • How to get last Friday of month(s) using .NET

    - by Newbie
    I have a function that returns me only the fridays from a range of dates public static List<DateTime> GetDates(DateTime startDate, int weeks) { int days = weeks * 7; //Get the whole date range List<DateTime> dtFulldateRange = Enumerable.Range(-days, days).Select(i => startDate.AddDays(i)).ToList(); //Get only the fridays from the date range List<DateTime> dtOnlyFridays = (from dtFridays in dtFulldateRange where dtFridays.DayOfWeek == DayOfWeek.Friday select dtFridays).ToList(); return dtOnlyFridays; } Purpose of the function: "List of dates from the Week number specified till the StartDate i.e. If startdate is 23rd April, 2010 and the week number is 1,then the program should return the dates from 16th April, 2010 till the startddate". I am calling the function as: DateTime StartDate1 = DateTime.ParseExact("20100430", "yyyyMMdd", System.Globalization.CultureInfo.InvariantCulture); List<DateTime> dtList = Utility.GetDates(StartDate1, 4).ToList(); Now the requirement has changed a bit. I need to find out only the last Fridays of every month. The input to the function will remain same.

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  • Selenium : Handling Loading screens obscuring the web elements. (Java)

    - by Sheldon Cooper
    I'm writing an automated test case for a web page. Here's my scenario. I have to click and type on various web elements in an html form. But, sometimes while typing on a text field, an ajax loading image appears , fogging all elements i want to interact with. So, I'm using web-driver wait before clicking on the actual elements like below, WebdriverWait innerwait=new WebDriverWait(driver,30); innerwait.until(ExpectedConditions.elementToBeClickable(By.xpath(fieldID))); driver.findelement(By.xpath(fieldID)).click(); But the wait function returns the element even if it is fogged by another image and is not clickable. But the click() throws an exception as Element is not clickable at point (586.5, 278). Other element would receive the click: <div>Loading image</div> Do I have to check every time if the loading image appeared before interacting with any elements?.(I can't predict when the loading image will appear and fog all elements.) Is there any efficient way to handle this? Currently I'm using the following function to wait till the loading image disappears, public void wait_for_ajax_loading() throws Exception { try{ Thread.sleep(2000); if(selenium.isElementPresent("id=loadingPanel")) while(selenium.isElementPresent("id=loadingPanel")&&selenium.isVisible("id=loadingPanel"))//wait till the loading screen disappears { Thread.sleep(2000); System.out.println("Loading...."); }} catch(Exception e){ Logger.logPrint("Exception in wait_for_ajax_loading() "+e); Logger.failedReport(report, e); driver.quit(); System.exit(0); } } But I don't know exactly when to call the above function, calling it at a wrong time will fail. Is there any efficient way to check if an element is actually clickable? or the loading image is present? Thanks..

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  • Creating a custom ubuntu ISO

    - by ajstack
    Hi, I want to create a custom ubuntu ISO (This ISO will contain all the packages with the latest updates released till date). Something along the lines of Take the pristine ubuntu ISO Download the updates from some ubuntu update repositories Re-create the ISO? How should I go about this?

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  • iis not listening on port 80

    - by user57467
    We have server 2003 and ISA 2004 with IIS 6 on same machnie. Everything worked well till yesterday, when we try to make some new rule in ISA..but this is a long story... Unfortunatelly something happend with our intranet site. Our site is on the port 80, but if we try to open on this client machines then we got and error page (which error page is our provider): 403-forbidden; Remote host not listening, the remote host is not prepared to acceppt the connection request. On the server i can open the site with port 80. If i change the port number in the iis and try to open the site with the port, then works well. I try to shut down IIS and start apache with a simple page. On the server works well but in clients the problem is the same, so i think this is not an IIS related problem. In the ISA we have a web pub rule, with port 80, no auth. Im pulling out my hair, please help. after uninstall and reinstall ISA, de sites work well, till i configure the upstream proxy in the conf/network/web chaining menu and then everything went same... So something wrong with the web-proxy / upstream function... (all my http request forward to my upstream proxy). That was the set long time ago...but a few day ago somehing went wrong... I think maybee our ISP spoiled something..tomorrow i try to figure out... But one more thing: I make a new rule before the default rule in the conf/network/web chaining menu. Every request go to the server not redirected.. Redirect to upstream server.... So if the request goes to our server (our site) then handled locally, and if not then go to upstream proxy and voilllaaa....i tougth... But unfortunatelly: our website work well, but internet work extreamly slowly..:( Maybee with single adapter i can made this? I have to handle all request locally or i have to send all to upstream? I cant filter it?

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  • Database Mirroring of SQL server

    - by jbp117
    I have two databases that are mirrored to another server using database mirroring. The mirror server has to be down for some reason for few days. Now the production server is having principal databases in (PRINCIPAL/DISCONNECTED) State. Clients can access those databases. So what happens when they keep on adding data to these databases?? Will the data get committed or waits till the mirror comes up?

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