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• 3D Math: Calculate Bank (Roll) angle from Look and Up orthogonal vectors

  - by 742

  I hope this is the proper location to ask this question which is the same as this one, but expressed as pure math instead of graphically (at least I hope I translated the problem to math correctly). Considering: two vectors that are orthogonal: Up (ux, uy, uz) and Look (lx, ly, lz) a plane P which is perpendicular to Look (hence including Up) Y1 which is the projection of Y (vertical axis) along Look onto P Question: what is the value of the angle between Y1 and Up? As mathematicians will agree, this is a very basic question, but I've been scratching my head for at least two weeks without being able to visualize how to project Y onto P... maybe now too old for finding solutions to school exercises. I'm looking for the trigonometric solution, not a solution using a matrix. Thanks.

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• Python - Using "Google AJAX Search" API's Local Search Objects

  - by user330739

  Hi! I've just started using Google's search API to find addresses and the distances between those addresses. I used geopy for this, but, I often had the problem of not getting the correct addresses for my queries. I decided to experiment, therefore, with Google's "Local Search" (http://code.google.com/apis/ajaxsearch/local.html). Anyway, I wanted to ask if I could use the "Local Search" objects provided by the API within python. Something tells me that I can't and that I have to use json. Does anyone know if there is a work around? PS: Im trying to make something like this: http://www.google.com/uds/samples/random/lead.html ... except a matrix type deal where the insides will be filled with distances between the addresses. Thanks for reading!

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• nmap reports host up when it isn't

  - by martianway

  On an Ubuntu VM I ran: sudo nmap -sP 192.168.0.* This returned: Starting Nmap 5.00 ( http://nmap.org ) at 2010-12-28 22:46 PST Host 192.168.0.0 is up (0.00064s latency). Host 192.168.0.1 is up (0.00078s latency). Host 192.168.0.2 is up (0.00011s latency). . . . Host 192.168.0.254 is up (0.00068s latency). Host 192.168.0.255 is up (0.00066s latency). The problem is I only have 4 live machines on 192.168.0.* so why did nmap report every ip in the subnet has a live host? The ip address of the Ubuntu machine is 192.168.28.131 From this VM I can ping the live systems on my internal subnet 192.168.0.* and get the expected response. And if I ping a machine that doesn't exist I can get no response as expected.

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• Does Basic User Authentication require 2-Phase communiation?

  - by RED SOFT ADAIR-StefanWoe

  My Application connects to the Internet to HTTP Services using boost::asio. Recently we added support for HTTP Proxys and Basic User Authentication. We implemented Basic User Authentication by just sending Authentication parameters with every HTTP call if a user configured a proxy in our program. Parameters are sent as described here: Authorization: Basic <base64 Encoded username:password> This works at least for one user and his proxy server. Other users report that their Proxy server replys with 407 Proxy Authentication Required My guess is that some proxy servers accept 1 one phase authentication and that others don't. I do not find any information that a 2 Phase communication is requested where the access always is denied for the first call by returning 407 and that only a second call is accepted. Our program yet does not retry the call if a 407 has been returned. Do we have to add this? I asked this question before on stackoverflow but did not get a sufficient answer.

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• Certain selected files are not deleting when I use Disk Cleanup

  - by Stephanie Malouff

  I am using Windows 7 and have been trying to retrieve disk space, but when I run Disk Cleanup the Temporary Internet files (18.1KB) and System archived Windows Error Report (267KB) will not delete. It goes through the process as if they are being deleted, but my disk space remains the same; I then go back to Disk Cleanup to see if they have been removed and they are still there. I have tried removing them individually as well, but the outcome is still the same. Can someone please tell me why this is happening and what I can do to get them to delete properly?

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• Excel chart: How to reverse the X axis of time series data

  - by JohnnyLambada

  In Excel 2003, I have a time series from a financial report that goes something like this: 2007 2006 2005 Amount 300 200 100 I want to create a graph of the time series that looks something like this (please excuse the ugly ascii graph): 300| .x | ... 200| .x.. | ... 100| x |____________________ 0 2005 2006 2007 But intead of getting an upward sloping graph, excel wants to put my time series in reverse (the way it actually appears in the spreadsheet). Is there any way to make excel display the x axis in reverse of the way it normally does? I've tried manually reversing the range in the chart dialog (changing a range of B1:D3 to D3:B1), but excel just puts it back.

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• Expanding RAID 1 array size (Adaptec 1420SA controller)

  - by cincura.net

  I have an Adaptec 1420SA controller in server and RAID 1 array created. The old disks slowly started to report S.M.A.R.T errors so I replaced first one, rebuild array and then other one and rebuild the array again. But the new drives are bigger, so I'd like to expand the array to use full disk capacity. Is it somehow possible? In the Adaptec configuration utility, after POST, I didn't found anything that could do it. I still have the old drives, if it helps. The array is used for system (Windows 2008 R2 SP1) booting. Thanks.

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• Why wouldn't `new int[x]{}` be valid???

  - by dboarman-FissureStudios

  In MonoDevelop I have the following code which compiles: int[] row = new int[indices.Count]{}; However, at run-time, I get: Matrix.cs(53,53): Error CS0150: A constant value is expected (CS0150) (testMatrix) I know what this error means and forces me to then resize the array: int[] row = new int[indices.Count]{}; Array.Resize(ref row, rowWidth); Is this something I just have to deal with because I am using MonoDevelop on Linux? I was certain that under .Net 3.5 I was able to initialize an array with a variable containing the width of the array. Can anyone confirm that this is isolated? If so, I can report the bug to bugzilla.

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• Reply to mailman archived message

  - by Jasper

  (not exactly sure if this is the right place for this question, but I trust you will migrate it if it isn't) I was having a problem with gdb, and while there issue appears to be recurring, I found only one instance of someone recently experiencing the same problem. I found this other instance on a mailman archived mailing list. Then I tried some more things and finally solved the issue with gdb. So, now I want to report back the solution I found to the mailing list. However, this is really only of use if mailman recognizes my mail as being the same thread as the original problem, but I do not have that mail (just the online archived version of it) so I cannot reply to it. My question: How can I make sure mailman considers my mail as a reply to that thread? Is simply copying the topic enough?

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• why do I get this mail server configuration error?

  - by Francesco

  <<The configuration of your mail servers and your DNS are not ok! The report of the test is: mail.mydomain.com. -> mydomain.com -> 78.47.63.148 -> static.148.63.47.78.clients.your-server.de Spam recognition software and RFC821 4.3 (also RFC2821 4.3.1) state that the hostname given in the SMTP greeting MUST have an A record pointing back to the same server.>> I have a A Record that points mail.mydomain.com to 78.47.63.148 (which is my given ip address for my vps) All other records are fine, so what's wrong and what record should I create to make it right? Thanks

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• What software is available to keep track of hundreds of servers?

  - by djangofan

  What good software is available (free or not free) to help me keep track of information relating to hundreds of servers, their relationships to each other (parent/child, category, type), and information on connecting to them, as well as possibly showing a picture or grid of some kind that allows me to report these relationships and key information to my supervisor. I am trying to avoid the "spreadsheet solution" or "visio solution" because I want to share this information and make changes with other persons in my server team. In other words, the solution I am looking for is a cross between a spreadsheet solution and a visio solution, providing both graphing and configuration information WITHOUT monitoring, and in a consistent format.

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• Mailman bounces go to me, do not unsubscribe user! (MacOS Server)

  - by vy32

  I run a large mailing list (30,000 users). Every month I get a whole slew of bounces in my mailbox from the "mailing list memberships reminder" that get sent out. I thought that these were supposed to go to the program and automatically unsubscribe people, not go to me. We are running a standard unmodified MacOS Server installation. Here is a typical bounce: From: Mail Delivery System Subject: Undelivered Mail Returned to Sender To: [email protected] This is the mail system at host mail.COMPANY.COM. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system ... Any idea what to do?

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• OpenGL Performance Questions

  - by Daniel

  This subject, as with any optimisation problem, gets hit on a lot, but I just couldn't find what I (think) I want. A lot of tutorials, and even SO questions have similar tips; generally covering: Use GL face culling (the OpenGL function, not the scene logic) Only send 1 matrix to the GPU (projectionModelView combination), therefore decreasing the MVP calculations from per vertex to once per model (as it should be). Use interleaved Vertices Minimize as many GL calls as possible, batch where appropriate And possibly a few/many others. I am (for curiosity reasons) rendering 28 million triangles in my application using several vertex buffers. I have tried all the above techniques (to the best of my knowledge), and received almost no performance change. Whilst I am receiving around 40FPS in my implementation, which is by no means problematic, I am still curious as to where these optimisation 'tips' actually come into use? My CPU is idling around 20-50% during rendering, therefore I assume I am GPU bound for increasing performance. Note: I am looking into gDEBugger at the moment Cross posted at Game Development

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• iphone: repeating a transformation

  - by gonso

  Hi I'm trying to represent a view that rotates on the iphone screen. I have a button and when you press it, the view rotates 180 degrees. My problem is that this only works the first time. Here is the code: -(IBAction) flip:(id)sender{ CGAffineTransform transform; //the transform matrix to be used below //BEGIN ANIMATIONS [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:2.0]; //animate if (flag){ transform = CGAffineTransformMakeRotation( RADIANS(180) ); } else { transform = CGAffineTransformMakeRotation( RADIANS(-180) ); } flag = !flag; transform = CGAffineTransformTranslate(transform, 0, 0); self.mySuview.transform = transform; //COMMIT ANIMATIONS [UIView commitAnimations]; } The first time you click, the view spins alright, but when you click again NOTHING happens. No errors, no changes on the view. What am I missing? Thanks Gonso

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• Error from DNS validation service: RFC821 4.3

  - by ferdi

  So I've managed to setup bind9 and a mail server, but it seems there is something wrong. I don't quite under stand this error: The configuration of your mail servers and your DNS are not ok! The report of the test is: mail.domain.com. - mail.domain.com - 208.xxx.xxx.xxx - lisa.domain.com Spam recognition software and RFC821 4.3 (also RFC2821 4.3.1) state that the hostname given in the SMTP greeting MUST have an A record pointing back to the same server. Can anyone explain this to me in a bit more detail, and maybe point me in a direction to solve this?

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• Apache Issues on Windows Server 2008

  - by dlackey

  I'm looking to reinstall Apache 2.2.25 since I continue to get these errors in the Windows Application log every 2-5 minutes: Faulting application name: httpd.exe, version: 2.2.25.0, time stamp: 0x51dd049c Faulting module name: zlib1.dll, version: 1.2.3.0, time stamp: 0x4790446a Exception code: 0xc0000005 Fault offset: 0x00002bad Faulting process id: 0x38e8 Faulting application start time: 0x01cfbfd70cdfbc4f Faulting application path: C:\Apache2\bin\httpd.exe Faulting module path: C:\Apache2\bin\zlib1.dll Report Id: 745f20de-2bca-11e4-bd5d-002590f28d7e If the new install doesn't work or if there are some "issues", can I simply restore the Apache2 directory from backup and then I'll just be back where I started? I thought about just renaming the current install to something like c:\apache2_old and if something fails, I can delete the new install and rename c:\apace2_old back to c:\apache. What do you all think?

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• Unused Index Entries: What causes them?

  - by Bart Silverstrim

  I was running chkdsk on one of our servers and it fixed 800 unused index entries (minor inconsistencies) on the drive. I also see these on lab machines running Deep Freeze, where most drive changes are supposed to be prevented although I'm not sure of the mechanism through which it does this. The thing that got me more curious than usual is that this server does very little. Very little activity, it remotely serves out a web app with little use so it's rarely ever touched at the console...so what is it on NTFS drives that causes this? It seems to be treated as if it's nothing, but should this be happening on a barely used filesystem? Is it a sign of corruption? I would think it's something if a disk repair utility sees fit to report it and repair it. Maybe this is more curiosity while doing some routine maintenance on servers, but I'd like to know what this is doing and why it happens, if anyone can give insight on this phenomena.

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• Testing for the existence of a field in a class

  - by Brett

  Hi, i have a quick question. I have a 2D array that stores an instance of a class. The elements of the array are assigned a particular class based on a text file that is read earlier in the program. Since i do not know without looking in the file what class is stored at a particular element i could refer to a field that doesn't exist at that index (referring to appearance when an instance of temp is stored in that index). i have come up with a method of testing this, but it is long winded and requires a second matrix. Is there a function to test for the existence of a field in a class? class temp(): name = "default" class temp1(): appearance = "@"

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• Finding many local max in an image (using MatLab)

  - by wenh42

  How do you go about figuring our multiple max in a 2D image where the max aren't necessarily all the same height? I have found that the imregionalmax(), imextendedmax(), and findpeaks() functions aren't necessarily that helpful because they give many local max that are really just maxes within the background noise. I tried bw=arrayimdilate(array,[1 1 1; 1 0 1; 1 1 1]) but that also is kind of limited for the same reasons (same thing with expanding the matrix that it uses). I'd definitely appreciate some help..

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• Can't see progress of rolling back SPID with KILL WITH STATUSONLY

  - by BradC

  I have a SPID on SQL 2005 that shows in Activity Monitor as "ROLLBACK" mode (because a transaction log filled up, not because it was manually killed). I tried to see how much time it has left to roll back with a KILL 115 WITH STATUSONLY but it just said "Status report cannot be obtained. Rollback operation for Process ID 115 is not in progress." Can I safely issue a "KILL 115" so that I can see the rollback status? Does this actually do anything on a spid currently in rollback?

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• "Punch card" application

  - by icelava

  Our main-con manager is looking for a "punch card" type of attendance-logging application. We need to take attendance every day, and the most "automatic" method is simply to track when people unlock their Windows desktop screen (not logon, because many simply leave the computer on indefinitely), and report to a remote location/repository, where the administrator will be able to observe which users unlocked their screens each day. Has anybody come across such an application suite? It likely has to be a Windows service so that it operates regardless of who is logged into the system.

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• C++ MTL Library dimension.h bug?

  - by avanwieringen

  I've installed MTL on my Fedora Core 12 x64 system, but when building an application I get the following error: In file included from /usr/local/include/mtl/matrix.h:41, from /usr/local/include/mtl/mtl.h:40, from ltiSystem.hxx:4, from strTools.hxx:4, from ff.cxx:3: /usr/local/include/mtl/envelope2D.h:72: error: declaration of ‘typedef struct mtl::twod_tag mtl::envelope2D<T>::dimension’ /usr/local/include/mtl/dimension.h:19: error: changes meaning of ‘dimension’ from ‘class mtl::dimension<typename mtl::dense1D<T, 0>::size_type, 0, 0>’ make[1]: *** [ff.o] Error 1 Which would imply an error in MTL. I have changed to different MTL versions and the problem persists, but on Google there is no proper answer. I use the g++ compiler. Does anyone have a clye?

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• Software for defining rules for folder permissions and monitoring deviations

  - by Kjensen

  Let's say a company has a large number of users, and each user has a home area. On each share used for home area folders, I would like to define some rules saying who is supposed to have which permissions on the folder. Then I would like to audit automatically, that this is actually the case and get some sort of report on deviations. So a rule for \MegaServer\Home01 could be defined something like: Domain Admins - Full Control Backup Agent - Read [Home folder owner] - Full Control I am talking about Windows platform and Windows servers, although I think it would most likely also work for *nix machines that expose Windows shares. Does software like this exist? I could roll my own basic version, but if something already exists, that is usually a better option. I am aware of tools to make displaying permissions easier (AccessEnum, DumpSec), but that is not what I am looking for.

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• Program is not displaying output correctly

  - by Dave Lee

  My program is suppose to display information from a text file. The text file is here http://pastebin.com/qB6nX2x4 I cant find the problem in my program. I think it has to deal with the looping but im not sure. My program runs correctly but only displays the first line of text. Any help would be appreciated. #include <iostream> #include <string> #include <cstdlib> #include <fstream> using namespace std; int buildArrays(int A[],int B[],int C[]) { int i=0,num; ifstream inFile; inFile.open("candycrush.txt"); if(inFile.fail()) { cout<<"The candycrush.txt input file did not open"<<endl; exit(-1); } while(inFile) { inFile>>num; A[i]=num; inFile>>num; B[i]=num; inFile>>num; C[i]=num; i++; } inFile.close(); return i; } void printArrays( string reportTitle, int levelsArray[], int scoresArray[], int starsArray[], int numberOfLevels ) { cout<<endl; cout<<reportTitle<<endl; cout<<"Levels\tScores\tStars"<<endl; cout<<"---------------------"<<endl; for(int i=0;i<numberOfLevels;i++) { cout<<levelsArray[i]<<"\t"<<scoresArray[i]<<"\t"; for(int j=0;j<starsArray[j];j++) { cout<<"*"; } cout<<endl; } } void sortArrays( int levelsArray[], int scoresArray[], int starsArray[], int numberOfLevels ) { for(int i=0;i<numberOfLevels;i++) { for(int j=0;j<numberOfLevels;j++) { if(levelsArray[i]<levelsArray[j]) { int temp1=levelsArray[i]; int temp2=scoresArray[i]; int temp3=starsArray[i]; levelsArray[i]=levelsArray[j]; scoresArray[i]=scoresArray[j]; starsArray[i]=starsArray[j]; levelsArray[j]=temp1; scoresArray[j]=temp2; starsArray[j]=temp3; } } } } int main() { const int MAX=400; int levelsArray[MAX]; int scoresArray[MAX]; int starsArray[MAX]; int numberOfLevels=buildArrays(levelsArray,scoresArray,starsArray); printArrays( "Candy Crush UNSORTED Report", levelsArray, scoresArray, starsArray, numberOfLevels ); sortArrays( levelsArray, scoresArray, starsArray, numberOfLevels); printArrays( "Candy Crush SORTED Report", levelsArray, scoresArray, starsArray, numberOfLevels ); system("pause"); }

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• C++ domain specific embedded language operators

  - by aaa

  hi. In numerical oriented languages (Matlab, Fortran) range operator and semantics is very handy when working with multidimensional data. For example: A(i:j,k,:n) // represents two-dimensional slice B(i:j,0:n) of A at index k unfortunately C++ does not have range operator (:). of course it can be emulated using range/slice functor, but semantics is less clean than Matlab. I am prototyping matrix/tensor domain language in C++ and am wondering if there any options to reproduce range operator. I still would like to rely on C++/prprocessor framework exclusively. So far I have looked through boost wave which might be an suitable option. is there any other means to introduce new operators to C++ DSL?

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