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• Android: Find coordinates of a certain point X meters from my location moving towards the point I am

  - by Aidan

  Hi Guys, I'm constructing a geolocation based application and I'm trying to figure out a way to make my application realise when a user is facing the direction of the given location (a particular long / lat co-ord). I've done some Googling and checked the SDK but can't really find anything for such a thing. Does anyone know of a way? Example. Point A = Phones current location. Point B = A's orientation in relation to true north + 45 + max distance towards the direction your facing, Point C = A's orientation in relation to true north - 45 + max distance towards the direction your facing. So now you have a triangle constructed. pretty schweet huh? yeah.. I think so.. So now that I have my fancy Triangle I use something called Barycentric Coordinates ( http://en.wikipedia.org/wiki/Barycentric_coordinates_(mathematics) ). This will allow me to test another point and see if it is in the triangle. If it is, it means we're facing it AND it's within the right distance. So it should be displayed on screen. If I'm facing 90 degrees from true north. The distance it travels should be that direction. 90 degrees from true north. It should not be 100 degrees or something from true north! But the problem is I haven't yet figured out how I make the device realise it must go "out" the direction it is facing.

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• How to point subdomain to a nameserver?

  - by vonconrad

  I've got an old crusty WHM/cPanel server which I'm trying to get rid of. I've got a new setup on shared hosting which is much cheaper in the long run. The problem is that there are a bunch of websites on the server whose domains I don't have access to. They're currently pointing to name servers of my domain (ns.mydomain.com), but the new provider has their own name servers (ns.provider.com) which I have to use instead. My initial idea was to set up a CNAME to point my name server to my provider's: ns.mydomain.com CNAME ns.provider.com, but I read in this question that this would be a bad idea. The accepted answer suggests using an A record instead, and I want to make sure how this would work. Assuming ns.provider.com has an IP address of 123.123.123.123, is it just a matter of doing ns.mydomain.com A 123.123.123.123? Is there any way the provider could block those requests as the name server domain technically doesn't belong to them?

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• Deterministic floating point and .NET

  - by code2code

  How can I guarantee that floating point calculations in a .NET application (say in C#) always produce the same bit-exact result? Especially when using different versions of .NET and running on different platforms (x86 vs x86_64). Inaccuracies of floating point operations do not matter. In Java I'd use strictfp. In C/C++ and other low level languages this problem is essentially solved by accessing the FPU / SSE control registers but that's probably not possible in .NET. Even with control of the FPU control register the JIT of .NET will generate different code on different platforms. Something like HotSpot would be even worse in this case... Why do I need it? I'm thinking about writing a real-time strategy (RTS) game which heavily depends on fast floating point math together with a lock stepped simulation. Essentially I will only transmit user input across the network. This also applies to other games which implement replays by storing the user input. Not an option are: decimals (too slow) fixed point values (too slow and cumbersome when using sqrt, sin, cos, tan, atan...) update state across the network like an FPS: Sending position information for hundreds or a few thousand units is not an option Any ideas?

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• Restoring the Fonts folder by using a restore point

  - by ryalho

  I am an idiot. Who would have thought that installing 2 gigs of fonts would be detrimental to the boot up time for the most common design programs such as adobe illustrator. I would like to restore the font folder because I am no longer able to just delete the fonts. It takes too long. So when I right-click the fonts folder and select "Restore Previous Versions" I am able to find a restore point, but the "Restore" button is greyed out. this leads me to think that I cannot change the settings of files in the windows directory. Oh and there are 34,000 fonts I need gone. Thanks

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• Create my own custom ellipsis bullet point

  - by Airn5475

  I regularly use an ellipsis as a bullet point in a list of items in Word/Outlook 2010. Example: I like summer because... ... it's warm out. ... we go on vacation. ... my birthday is in July. Currently in Word/Outlook if you type certain characters like a hyphen and hit space, it will automatically start a bulleted list using the hyphen. I would really like the same functionality with the ellipsis. When I type the third period and hit space, start a bulleted list. Does anyone know of a way to do this? Registry hack? Hidden Word Setting?

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• Win 2003 Junction Point to Remote Unix Share

  - by Pogrindis

  Env : Windows Server 2003 with already established shared folders over the local Domain via Windows DC and AD. - Linux box being used as a fileserver with the folder /files/share being R+W by all domain users, this is not a problem. I have already transfered the files from the Windows Box to the /files/share on the Linux Box however i now want to create a junction point in order to prevent users saving to the Windows box. I have tried the FileServer Administration on windows server 2003 however it will not allow me to junction remote servers. I have tried mounting the remote filesystem as a drive and proceeding that way however no joy. Anyone have any suggestions ?

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• SQL - Query range between two dates (NON-VBA)

  - by Mohgeroth

  I see various topics on this around stack overflow but none that fit the contect of MS-Access... Given a starting date and an ending date, is there a way through SQL to return records for each given month within the time frame? EG: Between #1/1/2010# and #12/31/2010# results #1/4/2010# #1/11/2010# ..... #12/27/2010# Restrictions MS-Access 2003 :No Case/Loops inside the SQL (IIF statements are good) This is a view only, NO VBA will be used since the data will not be tampered with. Disconnected recordset is my last option. I would prefer to find out theres some way to call your customized functions in the SQL to help return these values... some class stored on a global scope while you iterate through this date range maybe... Is this possible? I see many no's, but if there was a way to pass a value into a function I could find a way to make this work. Sad that I don't have a way to simulate a stored procedure without using a d/c recordset, at least that I know of... any experts out there know a way?

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• computer randomly restarting. both in game and out of game

  - by eric

  first my specs are. AMD Phenom II x4 955 processor 3.2ghz 20gb ddr3 ram 4Gb Nvidia Geforce GTX 770 850w Corsair tx850w psu Gigabyte ud3 mobo Windows 7 professional I recently uprgraded my vid card to gtx770 and upgraded my psu to the 850w thats in it now. i did a reformat with the installation of the new gpu and psu and started fresh and only have a couple programs installed (diablo3, nvidia control panel, wow, and steam). all drivers are up to date and everything is hooked up correctly. the problem is it will randomly shut down. no blue screen. just turns itself straight off and reboots after a couple seconds. occasionally i will have to unplug the power cable from the psu for a few minutes then reconnect and it will start up. it seems pretty random. sometimes it does it when my pc is just sitting there on the home screen. and sometimes it does it during games. and sometimes it doesnt do it for days at a time. i noticed the psu felt hot so i put an extra fan blowing straight onto both the psu and gpu and neither feel overly hot after it shuts down now. could it just be that it is a psu problem. the psu was taken from another machine but wasnt having this problem in that machine. i have seen a few articles online about gtx770 doing the same thing. but i havent found any answers or solutions. any help will be appreciated. im sure the 850w is enough to power my machine, im just stumped and ran out of ideas to fix it. i have even returned the video card for another thinking it might have been an issue with that particular card, but still gettin the same problem.

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• Set the background color for a fixed range of cells

  - by Count Boxer

  I have VBA code in an Excel spreadsheet. It is used to set the font and background color of a cell based on the value in that cell. I am doing it in VBA instead of "Conditional Formatting" because I have more than 3 conditions. The code is: Private Sub Worksheet_Change(ByVal Target As Range) Dim c As Range, d As Range, fc As Long, bc As Long, bf As Boolean Set d = Intersect(Range("A:K"), Target) If d Is Nothing Then Exit Sub For Each c In d If c >= Date And c <= Date + 5 Then fc = 2: fb = True: bc = 3 Else Select Case c Case "ABC" fc = 2: fb = True: bc = 5 Case 1, 3, 5, 7 fc = 2: fb = True: bc = 1 Case "D", "E", "F" fc = 2: fb = True: bc = 10 Case "1/1/2009" fc = 2: fb = True: bc = 45 Case "Long string" fc = 3: fb = True: bc = 1 Case Else fc = 1: fb = False: bc = xlNone End Select End If c.Font.ColorIndex = fc c.Font.Bold = fb c.Interior.ColorIndex = bc c.Range("A1:D1").Interior.ColorIndex = bc Next End Sub The problem is in the "c.Range" line. It always uses the current cell as "A" and then goes four cells to the right. I want it to start in the "real" cell "A" of the current row and go to the "real" cell "D" of the current row. Basically, I want a fixed range and not a dynamic one.

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• How to create a Service Connection Point for Exchange (Manually)

  - by Ionoxx

  I'm being cautious here. Before I remove anything I want to be able to put it back. I'm having issues with a domain joined computer that is using SCP to get exchange autodiscovery information. It's getting information for the now unused internal Exchange through SCP even through the profile is using Office 365 on another domain. According to this conversation, I can simply remove the object from Active Directory Sites and Services. I want to know how to add back in should this create more problems, or if we reinstate the Exchange server. Right clicking on the parent "autodiscover" node doesn't allow me to create a Service Connection Point. Will simply running the cmdlet "Set-ClientAccessServer -identity servername -AutodiscoverServiceInternalUri url" be enough to recreate the object? Thank you!

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• Point IP to site for testing before delegation?

  - by cosmicbdog

  I'm migrating to a new server and would like to test before redelegating the domain over. I have some familiarity with setting up apache virtual hosts, but limited knowledge. How can I go about setting this up? My server already has a domain delegated to the server, and the IP by default has been setup to point to that. I've been told I can just add an entry to /etc/hosts/ which I haven't been able to understand what I can add in there to make this work. Any pointers would be greatly appreciated!

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• Point Subdomain to another application on another domain

  - by Juanu Haedo

  I'm not a very experienced Server Administrator and I'm trying to set up a new one I just got. I'm Using IIS7 and DNS Server What I need is that a url such as: mail.domainA.com points to www.domainB.com/webmail And I want to do this for all other domains... I want all of my domains that start with mail., point to www.domainB.com/webmail In short: I need a Subdomain to redirect to another URL... An improvement would be to let the subdomain as it is on the address bar on the redirection, if possible... Any help?

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• .net byte[] to List<List<Point>>

  - by user1112111

  Is is possible to convert a byte array back to a List<List<Point>> ? LE: I am saving the List<List<Point>> in a database BLOB field. When I retrieve it, I want to convert it back to a List<List<Point>>. So I have the byte[], but I cannot figure out how to convert it. How should the de/serialization look like ?

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• Algorithm for finding the smallest power of two that's greater or equal to a given value

  - by Boyan

  I need to find the smallest power of two that's greater or equal to a given value. So far, I have this: int value = 3221; // 3221 is just an example, could be any number int result = 1; while (result < value) result <<= 1; It works fine, but feels kind of naive. Is there a better algorithm for that problem? EDIT. There were some nice Assembler suggestions, so I'm adding those tags to the question.

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• How do I change a Git remote HEAD to point to something besides "master"

  - by jhs

  Short version: How do I set a Git remote's HEAD ref to point to something besides "master"? My project has a policy not to use a "master" branch (all branches are to have meaningful names). Furthermore, the canonical master repository is only accessible via ssh://, with no shell access (like GitHub or Unfuddle). My problem is that the remote repository still has a HEAD reference to refs/heads/master, but I need it to point to a different branch. This is causing two problems: When cloning the repo, there this, warning: remote HEAD refers to nonexistent ref, unable to checkout. That's confusing and inconvenient. The web-based code browser depends on HEAD as a basis for browsing the tree. I need HEAD to point to a valid branch, then.

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• Determine Android phone's proximity to known point while conserving power

  - by ahsteele

  I am trying to determine if an Android user has had a close proximity to a list of predetermined locations. I'd like to do this with the least amount of drain on the phone's battery. The two mechanisms I see for accomplishing this are proximity alerts and requesting location updates. What are the pros and cons of the two methods? Will one have less affect on the battery than the other? In either case I would guess the specific location manager used would affect power usage (existing Stack Overflow answer).

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• Orbital equations, and power required to run them

  - by Adam Davis

  Due to a discussion on the SO IRC today, I'm curious about orbital mechanics, and The equations needed to solve orbital problems The computing power required to solve complex problems The question in particular is calculating when the Earth will plow into the Sun (or vice versa, depending on the frame of reference). I suspect that all the gravitational pulls within our solar system may need to be calculated, which makes me wonder what type of computer cluster is required, or can this be done on a single box? I don't have the experience to do a back of the napkin test here, but perhaps you do? Also, much thx to Gortok for the original inspiration (see comments).

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• Excel 2003 - How to build my own XLA?

  - by Justin

  How can you make the .xla file if you want to create your own xla? I have the code, classes, shapes, etc....what is the process to making an xla file to point to? I know that I have to put it in my program files folder, and then go through the steps to adding an "add-in" in xls...but i mean actually saving an xla file to point to.... can i simply write all this in xls and then save it as file type xla?? because i have tried to do that but I get an error that it is not a valid add in when I am in a spreadsheet trying to point to it? thanks!

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• Extend MySQL implementation of PiP Algorithm?

  - by Mike

  I need to make a point in polygon MySQL query. I already found these two great solutions: http://forums.mysql.com/read.php?23,286574,286574 MySQL implementation of ray-casting Algorithm? But these functions can only check if one point is inside a poly. I have a query where the PiP part should only be one part of the query and check for x points inside a polygon. Something like this: $points = list/array/whatever of points in language of favour SELECT d.name FROM data AS d WHERE d.name LIKE %red% // just bla bla // how to do this ? AND $points INSIDE d.polygon AND myWithin( $points, d.polygo ) // or UPDATE I tried it with MBR functions like this: SET @g1 = GeomFromText('Polygon((13.43971 52.55757,13.41293 52.49825,13.53378 52.49574, 13.43971 52.55757))'); SET @g2 = GeomFromText('Point(13.497834 52.540489)'); SELECT MBRContains(@g1,@g2); G2 should NOT be inside G1 but MBR says it is.

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• Fastest way to find the closest point to a given point in 3D, in Python.

  - by Saebin

  So lets say I have 10,000 points in A and 10,000 points in B and want to find out the closest point in A for every B point. Currently, I simply loop through every point in B and A to find which one is closest in distance. ie. B = [(.5, 1, 1), (1, .1, 1), (1, 1, .2)] A = [(1, 1, .3), (1, 0, 1), (.4, 1, 1)] C = {} for bp in B: closestDist = -1 for ap in A: dist = sum(((bp[0]-ap[0])**2, (bp[1]-ap[1])**2, (bp[2]-ap[2])**2)) if(closestDist > dist or closestDist == -1): C[bp] = ap closestDist = dist print C However, I am sure there is a faster way to do this... any ideas?

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• Matlab - Propagate unit vectors on to the edge of shape boundaries

  - by Graham

  Hi I have a set of unit vectors which I want to propagate on to the edge of shape boundary defined by a binary image. The shape boundary is defined by a 1px wide white edge. I also have the coordinates of these points stored in a 2 row by n column matrix. The shape forms a concave boundary with no holes within itself made of around 2500 points. What would be the best method to do this? Are there some sort of ray tracing algorithms that could be used? Or would it be a case of taking the unit vector and multiplying it by a scalar and testing after multiplication if the end point of the vector is outside the shape boundary. When the end point of the unit vector is outside the shape, just find the point of intersection? Thank you very much in advance for any help!

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• Rounding a positive number to a power of another number

  - by Sagekilla

  I'm trying to round a number to the next smallest power of another number. The number I'm trying to round is always positive. I'm not particular on which direction it rounds, but I prefer downwards if possible. I would like to be able to round towards arbitrary bases, but the ones I'm most concerned with at the moment is base 2 and fractional powers of 2 like 2^(1/2), 2^(1/4), and so forth. Here's my current algorithm for base 2. The log2 I multiply by is actually the inverse of log2: double roundBaseTwo(double x) { return 1.0 / (1 << (int)((log(x) * log2)) } Any help would be appreciated!

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• can the point have a longer history

  - by stevejb

  Hello, I often find myself in the following situation. Say I was editing a file with this contents \begin{itemize} \item \end{itemize} I really like http://stackoverflow.com ! And say the point was after the word \item. What I want to do is select http://stackoverflow.com , C-w it, and go back to \item, and yank it there. What I would do is C-s htt and that would bring the point to the 2nd t of http, and from there I would go backwards, C-SPC on h, then select the rest of the word. Now, I would like to use something like C-x C-x to bring me back to \item, but it will instead bring me back to the h of http. Is there a command like C-x C-x which brings the point back through its history of location? Thanks,

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• Best way to search a point across several polygons

  - by user1474341

  I have a requirement whereby I need to match a given point (lat,lon) against several polygons to decide if there is a match. The easiest way would be to iterative over each polygon and apply the point-in-polygon check algorithm, but that is prohibitively expensive. The next optimization that I did was to define a bounding rectangle for each polygon (upper bound, lower bound) and iteratively check the point against the bounding box (fewer comparisons as against checking all the points in the polygon). Is there any other optimization possible? Would a spatial index on the bound rectangle points or a geohash help ? Any guidance would be greatly appreciated. Thanks!

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• Set argument pointer to point to new memory inside a function (without returning it) IN C

  - by user321605

  Hello, Hopefully my title was descriptive enough to attract the right help. I want to write a function that will return 1 thing, and modify a provided pointer in another. My current function declaration is . . . char * afterURL replaceURLS(char * body) What I want to do is copy all of body's data into a new string, and set body to point to this new data. I then want afterURL to point to a location within the new string. My issue is getting the actual pointer that is passed in to this function to point to the new data. Thanks in advance! Rob

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