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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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • IIS 7 rewriting subdomain to point at a specific port

    - by Tommy Jakobsen
    Having installed Team Foundation Server 2010 on Windows Server 2008, I need an easy URL for our developers to access their repositories. The default URL for the TFS repositories is http://localhost:8080/tfs Now I want the subdomain domain tfs.server.domain.com to point at http://localhost:8080/tfs. And when you access tfs.server.domain.com/repos_name it should redirect to http://localhost:8080/tfs/repos_name. How can I do this in IIS7? I already tried using the following rule, but it does not work. I get a 404. <rewrite> <globalRules> <rule name="TFS" stopProcessing="true"> <match url="^(?:tfs/)?(.*)" /> <conditions> <add input="{HTTP_HOST}" pattern="^tfs.server.domain.com$" /> </conditions> <action type="Rewrite" url="http://localhost:8080/tfs/{R:1}" /> </rule> </globalRules> </rewrite> EDIT I actually got this working by adding a binding for the site on port 80 with host name tfs.server.domain.com. But using tfs.server.domain.com, I can't authenticate using Windows Authentication. Is there something that I need to configure for Windows Authentication? You can see a trace here: http://pastebin.com/k0QrnL0m

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  • Linksys WAP54G v3.1 no access, power and link LED solid

    - by user142113
    I'm managing the Network of a small enterprise. A Linksys WAP54G v3.1 used to provide the WiFi network. I was called, because the device did not provide a WiFi network anymore. I first of all tried to ping the device via LAN, but there was no reaction. I've frequently reconnected the AP to the mains and always the POWER and the LINK LED keep solid, even if no network cable is connected. What I've done yet: Reset as documented: Pressed the RESET button for 10 seconds. After that I have tried to access the AP with a direct cable connection to my computer, that I've set to a static ip of 192.168.1.240, but i got no ping response on the default IP 192.168.1.245. Furthermore ipconfig reports "media disconnected". More complex reset method as described here http://bruceshankle.blogspot.de/2005/12/how-to-reset-linksys-wap54g.html as well had no effect. also tried to ping 192.168.1.1 without success Tried this method: http://www.daniweb.com/hardware-and-software/networking/threads/142437/linksys-wireless-access-point-problem#post680245 but there was no ping response when powering up. As well the tftp transfer timed out Finally tried to short pin 15 and 16 of the flash chip on the bottom side of the AP mainboard while booting to provoke a Checksum error. This should lead to the possibility to upload a firmware with tftp, as the AP stops booting and waits for a tftp connection on 192.168.1.1. But I've had no success. As well i've put pin 15 and 16 to ground while booting, also without an effect. After all that I still can't ping the AP, ipconfig still tells me "media disconnected". The POWER and LINK LED are solid. I would appreciate your answers

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  • What is the point of PPPoE?

    - by aaa90210
    I am trying to expand my knowledge of networking beyond the basics. I have started reading about PPP, and how it is used in DSL modems with PPPoE and PPPoA. My first impression of PPP was "well that seems pretty similar to Ethernet". They are both data link layer protocols. They both have fields to identify the encapsulated protocol (e.g. IP). They both have related protocols to assign IP addresses (DHCP and NCP). So my first question was "so what's the point of PPP, why not just use Ethernet?". The answer to that was fairly straightforward - Ethernet is not supported over a wide range of media like serial lines, and is a fairly specific technology to LAN's using CAT5 or similar. HOWEVER - then I was reading about PPPoE, and the obvious thought was "well if we are doing something over Ethernet, then Ethernet must be available and in use, so why not just use it?". In other words, PPPoE seems to be encapsulating one data-link layer protocol in another very similar protocol. Why do IP-inside-PPP-inside-Ethernet when we could just be doing IP-inside-Ethernet, and use DHCP rather than NCP to assign the IP address to the home router? Thanks

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  • How to point a subdomain to local server with dynamic IP

    - by jlego
    I see there are many related questions to this one, however the answers given seem to be a little vague for a novice like me. I've got a dedicated LAMP stack running Fedora 16 locally on my home network. Everything works fine internally. I can access the Apache server from other machines on the network using the internal IP in a browser. I'm using the stack for a local file server as well as a development environment for websites. There are a couple of reasons why I would like the development sites hosted on the machine to be available publicly. 1.) I use a CMS that has paid add-ons which allows you to assign the paid license to a domain. I can't develop with paid add-ons on the closed dev server. 2.) I would occasionally like for clients to be able to view the site dev at late stages before it goes live. I have a domain (foo.com, and I want to point a *sub*domain (dev.foo.com) to the local server. I know this is best accomplished with a Static IP, however my IP from my ISP is Dynamic and I don't think there is any way to change that. From what I have read, services like ZoneEdit & DynDNS are supposed to be able to accomplish this, but I have tried both and found it very confusing. Also the server is behind a router and I have also read that you need to set up DDNS(?) in your router, that many routers have presets for these services, and I've found that DynDNS is the only one my router seems to support.

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  • Find the IP of the router between me and main router/gateway?

    - by Crash893
    I have a Netgear router that is the main router/gateway in and out of the network. Then I have a Linksys 54g router with WiFi that we use as are main WiFi access point The Cat5 runs from the router to the WiFi routers LAN port (not WAN). And then if you connect to that WAP you are basically on the network. I want to be able to find out what the IP address of that WAP is but so far I can't figure out how to: I've tried doing a tracert to the gateway IP but I get nothing. I've scanned all the IP addressed in the network. I've gone to the Netgear main router and looked under attached devices but it doesn't say anything. Any ideas on how I can figure out how to administer it? (I do have limited physical access but my attempt to plug into it came back with a faulty IP (in the 169 range where the rest of the office is 192.168...). I never set this router up to begin with so I'm reluctant to just kill it with the reset button because I can't get into see what the settings are set to.

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  • Sending mail through local MTA while domain MX records point to Google Apps

    - by Assaf
    My domain's email is managed by Google Apps, so that domain users get Gmail and Calendar, etc. But I also want to be able to send applicative notifications to users outside the domain via email (e.g. "some commented on your post", and so on). However, if I try to send email through code I get blocked by Gmail after a few emails. I send marketing email through MailChimp, to minimize the risk of appearing as spam to my users (one-click unsubscribe, etc.). But I can't send applicative message in this way. I want to install a local MTA (my server runs Ubuntu), but I'm not sure what anti-spam measures I need to implement so that receiving MTAs don't think it's a spam server. What's stopping anyone from setting up a mail server and sending emails using my domain name? AFAIK it's the DNS records that show the MTA's address actually belongs to the domain. But my understanding of this is rather superficial, so someone please correct me if I'm wrong. But what sort of DNS configuration do I need to put in place so that I don't get blacklisted (assuming I don't actually spam anyone)? The MX records already point to Google, and I'd like to keep it this way. So do I just need to define an A record for my internal mail server? Should it show email as coming from a sub-domain, so as not to conflict with the bare domain being managed by google? Edit: Does the following SPF record make sense if I want email from my domain name to be sent by either google's servers or any server with a dns name ending with mydomain.com? "v=spf1 ptr mx:google.com mx:googlemail.com ~all" How should I set up reverse DNS for my server? If I have an A record that points mailsender.mydomain.com to my MTA's ip address, does it mean that reverse lookup will only allow emails sent from [email protected]?

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  • Packets being dropped by iptables

    - by Shadyabhi
    I am trying to create a Software Access Point in linux. I followed the blog here. Steps I performed: Started dhcp server on wlan0. Properly configured hostapd.conf Enabled packet forwarding & masquerading. Two commands executed regarding iptables: iptables --table nat --append POSTROUTING --out-interface eth0 -j MASQUERADE iptables --append FORWARD --in-interface wlan0 -j ACCEPT I enabled logging on iptables & I get this in everything.log Jun 29 19:42:03 MBP-archlinux kernel: [10480.180356] IN=eth0 OUT=wlan0 MAC=c8:bc:c8:9b:c4:3c:00:13:80:40:cd:80:08:00 SRC=195.143.92.150 DST=10.0.0.3 LEN=44 TOS=0x00 PREC=0x00 TTL=52 ID=38025 PROTO=TCP SPT=80 DPT=53570 WINDOW=46185 RES=0x00 ACK URGP=0 Jun 29 19:42:03 MBP-archlinux kernel: [10480.389102] IN=eth0 OUT=wlan0 MAC=c8:bc:c8:9b:c4:3c:00:13:80:40:cd:80:08:00 SRC=195.143.92.150 DST=10.0.0.3 LEN=308 TOS=0x00 PREC=0x00 TTL=52 ID=14732 PROTO=TCP SPT=80 DPT=53570 WINDOW=46185 RES=0x00 ACK PSH URGP=0 Jun 29 19:42:03 MBP-archlinux kernel: [10480.389710] IN=eth0 OUT=wlan0 MAC=c8:bc:c8:9b:c4:3c:00:13:80:40:cd:80:08:00 SRC=195.143.92.150 DST=10.0.0.3 LEN=44 TOS=0x00 PREC=0x00 TTL=52 ID=14988 PROTO=TCP SPT=80 DPT=53570 WINDOW=46185 RES=0x00 ACK FIN URGP=0 Jun 29 19:42:03 MBP-archlinux kernel: [10480.621118] IN=eth0 OUT=wlan0 MAC=c8:bc:c8:9b:c4:3c:00:13:80:40:cd:80:08:00 SRC=195.143.92.150 DST=10.0.0.3 LEN=44 TOS=0x00 PREC=0x00 TTL=52 ID=63378 PROTO=TCP SPT=80 DPT=53570 WINDOW=46185 RES=0x00 ACK FIN URGP=0 I have almost no knowledge of iptables, all I did was through googling. So, can anyone help me in making me understand what wrong is happening here? I have tried running tcpdump on wlan0 & http packets are being sent from wlan0.

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  • Outdoor WiFi Mesh Topology vs. Repeaters

    - by IronJaxor
    Here's the current configuration in our organization (which I believe is incorrect): We have a number of Cisco 1500 series AP's (22 in total), that are mounted outdoors to provide seamless WiFi coverage over a large area. Each AP however has its own physical ethernet connection back to the WLC (All the AP's are marked as Root AP's). They are all broadcasting the same SSID. We have tried to stagger the channel selection but because there are only three non-overlapping channels to choose from, and in some areas the density of AP's is quite high, there is multiple places of channel interference. With this configuration we experience 100-150 disconnects from clients every day. (Our clients are mobile so they move throughout the coverage area constantly). My idea is to switch the AP's to the same channel thereby forming a wireless mesh, use the built in functionality of the 1500 series to use 802.11a as the backhaul, designate one or two AP's as root AP's and wire them back to the WLC. Thereby forming a WiFi mesh, which if I'm not mistaken is the point of the 1500 series in the first place! I am however completely new at WiFi networks and wondering if I am simply mistaken in what I believe my proposed changes will enable, or if there is a better way to tackle the WiFi topology.

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