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  • reflection paths between points in2d

    - by Chris H
    Just wondering if there was a nice (already implemented/documented) algorithm to do the following Given any shape (without crossing edges) and two points inside that shape, compute all the paths between the two points such that all reflections are perfect reflections. The path lengths should be limited to a certain length otherwise there are infinite solutions. I'm not interested in just shooting out rays to try to guess how close I can get, I'm interested in algorithms that can do it perfectly. Search based, not guess/improvement based.

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  • DShow : Enumeration sequence of IEnumMoniker

    - by KenC
    Hello, This is a question about DirectShow IEnumMoniker. Out of some reason, I have to know "what kind of order" IEnumMoniker enumerates items. (I mean, it's alphabetically or...?) The following pages are documents about IEnumMoniker, however, it doesn't mention about this : http://msdn.microsoft.com/en-us/library/ms692852(v=VS.85).aspx http://msdn.microsoft.com/en-us/library/dd407292%28VS.85%29.aspx If anybody has the idea about the enumeration sequence, please let me know. Thanks a lot.

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  • Rearranging a sequence

    - by sarah
    I'm have trouble rearranging sequences so the amount of letters in the given original sequence are the same in the random generated sequences. For example: If i have a string 'AAAC' I need that string rearranged randomly so the amount of A's and C's are the same.

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  • PHP Find Coordinates between two points

    - by Ozzy
    Hi all, simple question here. Lets say I have two points: point 1 x = 0 y = 0 point 2 x = 10 y = 10 How would i find out all the coordinates inbetween that programmatically, assuming there is a strait line between two points... so the above example would return: 0,0 1,1 2,2 3,3 ... 8,8 9,9 10,10 Thanks :)

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  • Extract points within a shape from a raster

    - by user308827
    Hi, I have a raster file (basically 2D array) with close to a million points. I am trying to extract a circle from the raster (and all the points that lie within the circle. Using ArcGIS is exceedingly slow for this. Can anyone suggest any image processing library that is both easy to learn and powerful and quick enough for something like this? Thanks!

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  • Undefined control sequence at first line of a document

    - by Jayomat
    \documentclass{book} \usepackage{amsmath} \usepackage[german]{babel} \usepackage{amssymb} \usepackage{amsxtra} \usepackage[dvips]{epsfig,psfrag} \usepackage{listings} .... this is how my file starts. I didn't even edit it, I received it like this. However, if I want to make a pdf, it gives me the undefined control sequence error at the first line... What is wrong??

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  • Categorize the approximate shape of an array of Points in 3D Space

    - by user1295133
    I have a set of points in 3d space and I want to be able to categorize the shape that best fits them - cube, sphere, cylinder, planar (flat) etc. I've looked at supervised/machine learning but since I need first generate a large training data set that's not really suitable. My dream solution would be a java library with a wonderful magical function something like : public enum ShapeType { CUBE, SPHERE, CYLINDER, PLANAR } public ShapeType CategorizeShapeFromPoints( 3DPoint[] points ) However, any and all help will be appreciated. Thanks

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  • Silverlight MouseMove: find missing points during a movement

    - by Jalfp
    In an application in Silverlight I'm working on, I need to track the moves of the mouse. My problem is that using the MouseMove event, I don't have a continuous set of points if the user moves the mouse fast enough (if I add each point in a list I can have (10,10) en then (20,20)...) I'd like to have ALL points where the mouse has been during the move. Do you have any idea ?

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  • Coloring close points

    - by ooboo
    I have a dense set of points in the plane. I want them colored so that points that are close to each other have the same color, and a different color if they're far away. For simplicity assume that there are, say, 5 different colors to choose from. Turns out I've not the slightest idea how to do that .. I'm using Tkinter with Python, by the way

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  • Loading an image sequence in InterfaceBuilder -ObjectiveC

    - by eco_bach
    Hi Using Actionscript and or in the Flash IDE you can either instantiate bitmaps from the library, or simply import bitmaps into the timeline of a MovieClip to create an image sequence. How would you do the same thing in InterfaceBuilder and-or using ObjectiveC? Do I need to create a new view for each and every image?

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  • resampling a series of points

    - by clamp
    hello, i have an array of points in 3d (imagine the trajectory of a ball) with X samples. now, i want to resample these points so that i have a new array with positions with y samples. y can be bigger or smaller than x but not smaller than 1. there will always be at least 1 sample. how would an algorithm look like to resample the original array into a new one? thanks!

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  • Minimize the sequence by putting appropriate operations ' DP'

    - by Vikas
    Given a sequence,say, 222 We have to put a '+' or '* ' between each adjacent pair. '* ' has higher precedence over '+' We have to o/p the string whose evaluation leads to minimum value. O/p must be lexicographically smallest if there are more than one. inp:222 o/p: 2*2+2 Explaination: 2+2+2=6 2+2*2=6 2*2+2=6 of this 3rd is lexicographically smallest. I was wondering how to construct a DP solution for this.

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  • C# Check for missing number in sequence

    - by Jon
    I have an List<int> which contains 1,2,4,7,9 for example. I have a range from 0 to 10. Is there a way to determine what numbers are missing in that sequence? I thought LINQ might provide an option but I can't see one In the real world my List could contain 100,000 items so performance is key

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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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  • Mac Share Points automatically authenticate with matching Windows AD credentials from Windows

    - by Ron L
    I recently started administering an OS X server (10.8) that is on the same network as our AD domain. While setting up Mac Share Points, I encountered some odd behavior that I hope someone can explain. For the purposes of this example assume the following: 1) Local User on OS X Server: frank, password: Help.2012 2) AD Domain User: frank, password: Help.2012 3) AD Domain: mycompany 4) OS X Server hostname: macserver (not bound to AD, not running OD) When joined to the domain on a a Win 7 computer and logged in as frank and accessing the shares at \\macserver, it automatically authenticates using frank's OS X credentials (because they are the same). However, if I change frank's OS X password, the standard Windows authentication dialog pops-up preset to use frank's AD domain (my company\frank). However, after entering the new OS X password, it will not authenticate without changing the domain to local (.\frank). Basically, if a user in AD has the same User name and password in OS X, it will authenticate automatically regardless of the domain. If the passwords differ, authenticating to the OS X shares must be done from the local machine. (and slightly off topic - how come an OS X administrator can access the root drives on the Mac server from Windows when accessing the Mac shares even when they aren't shared? In other words, it will show all the shared folders from "File Sharing" plus whatever drives are mounted in OS X)

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  • Cisco Access switch is dropping large amount of end points

    - by user135458
    This afternoon, with no changes to the network, a switch suddenly started dropping off lots of connections. These connections would come back up a few minutes later, then another area connected to the switch would drop off. This is an older 4006 chassis switch which could in and of itself be a problem but I'm looking to see what else you all would look for in trying to find a root cause. Switch is connected via ports 1/1 and 1/2 in an etherchannel to a VSS core 1/1/42 and 2/1/42. Both sides are up and working however the CPU on the switch will spike up to 99% and that's when CRC errors start to hit the VSS core on one of those interfaces and end points start dropping off. We tried new transceivers and SFP's on each side of the link, same result. When we tried swapping the fiber patch cables on the access switch the CRC errors did not follow the fiber cables they stayed with port 1/2 on the access switch. So port 1/2 on the supervisor module looks like the culprit. We actually tried to create a new member of the ethernet channel by taking a fiber media converter to cat5 and make that a member of the port-channel but when we plugged it in you couldn't even reach the switch. I'm guessing that's unrelated and a problem with the media converter. As of right now we have left it in a state of only one fiber cable running to one side of the VSS core (1/1 Access Switch -- 2/1/42). I've sent some info into TAC and they are looking into the situation but does anyone else have any commands I could run or some troubleshooting I could look into in the meantime?

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  • Setting up a virtual ftp directory that points to another computer

    - by AngryHacker
    I have II5 sitting on an old Windows 2000 Professional box. It has an FTP site there that allows me to access files. It works great, no problem at all. However, now I need to setup a virtual directory that points to a share on another computer on the network (running Windows XP Tablet Edition). The share requires a user name and password. The network is a simple workgroup (i don't have any domains or any of that). What is the correct procedure for that? I've tried setting a share via UNC and typing in the UserID/Password when asked. But when I finished, the virtual machine showed up as an error in the IIS Manager and couldn't access it. I mapped the share onto a drive and then tried to setup a virtual directory with this drive. Same result. Is there something simple I am missing? Would upgrading any part of the picture help at all?

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