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  • Why and what for: java enum

    - by Mat Banik
    Today I was browsing through some question on this site and I found mention of enum being used in singleton pattern and that there are some thread safety benefits to such solution. I never used enums and I have been programing in java for more than couple a years now. And apparently they changed a lot and now they even do full blown support of OOP within them selfs. Now why and what for should I used enum in day to day programing?

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  • Validating IPv4 string in Java

    - by Mat Banik
    Bellow method is validating if string is correct IPv4 address it returns true if it is valid. Any improvements in regex and elegance would be very appreciated: public static boolean validIP(String ip) { if (ip == null || ip.isEmpty()) return false; ip = ip.trim(); if ((ip.length() < 8) & (ip.length() > 15)) return false; try { Pattern pattern = Pattern.compile("^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$"); Matcher matcher = pattern.matcher(ip); return matcher.matches(); } catch (PatternSyntaxException ex) { return false; } }

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  • Whats the difference between theese two java code snippets?

    - by Joe Hopfgartner
    I have this code i am doing for university. The first code works as expected, the second one provides different results. I can not see what they are doing differently?? first: public Mat3 getNormalMatrix() { return new Mat3(this.getInverseMatrix()).transpose(); } second: public Mat3 getNormalMatrix() { Mat4 mat = this.getInverseMatrix(); Mat3 bla = new Mat3(mat); bla.transpose(); return bla; }

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  • Web log analyser with daily statistics per URL

    - by Mat
    Are there any good web server log analysis tools that can provide me with daily statistics on individual URLs? I guess I'm looking at something that can drill down into particular URLs and on particular days rather than just a monthly summary report. The following don't seem to meet my needs as they don't offer drilling down to get more detailed info: awstats analog webalizer (I'm running an nginx frontend into Apache with nginx outputting 'combined' format logfiles if it makes any difference.)

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  • Windows 7 just deleted 4 days of work wtf!?

    - by Mat
    Hey! I'm just a bit about to freak out. I just finished a project and rebooted my computer. It didn't want to boot anymore so I had to use the windows 7 system repair option. it run for a minute and then booted up. Now most of my sourcecode from the last 4 days of work is gone! background: sometimes (most often after installing new software) my notebook won't boot up anymore. It will just show the little Win 7 flag, but not read from the harddisk anymore. If I hardabord and reboot then, it asks me whether to start windows normally (which won't work) or to run "windows startup repair". If i run it, it does some stuff for about two or three minutes and then I can boot windows again. Usually after this, .exe files i added to the computer during previous days are gone - but other files so far were not touched. But now, after this happened, a whole bunch of ".as" (ActionScript source files) from my project are gone!! does anyone know where and whether there's a way to recover them?? please help! Thank you!

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  • How do I repair a Windows 7 installation damaged by Windows 8 sleep mode

    - by Mat
    I'm experimenting with a Windows 8 installation which is on a separate SSD. My actual Windows 7 installation I'm working with is on my old HDD. While Windows 8 was in sleep mode I swapped the hard disks and put in the Windows 7 HDD (I thought the computer was off). When I started the computer, Windows 8 started back up to the login screen – then it was stuck and some seconds later the computer rebooted. Now the Windows 7 Installation is damaged. When I boot, after the Windows 7 startup logo appears, a bluescreen shows up for few seconds stating: STOP: c000021a {Fatal System Error} The verification of KnownDLL failed. System process terminated unexpectedly with a status of 0xc000012f (0x00f0bb90 0x00000000). The system has been shut down. and then the computer reboots. The same happens in safe mode. 'Windows startup repair' cannot repair the issue. Any idea what could have happened exactly and/or how to repair this Windows 7 Installation?

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  • How to connect to Oracle DB via ODBC

    - by Mat
    I am attempting to connect to a remote Oracle DB via ODBC. I am totally inexperienced and fail to connect. What I have installed: Oracle 'ODBC Driver for RDB' A program I want to connect from (Altova Mapforce, an ETL) What I do: Under Administrative tools I open the Windows "ODBC Data Source Administrator I click 'Add..' and select the Oracle ODBC Driver The Window 'Oracle RDB Driver Setup' opens. I fill in: Data source name: free choice Description: I leave blank Transport: I choose TCP/IP Server: I input the IP address of the server Service: I leave 'generic' UserID: I enter the user name (that belongs to the password I have) Attach Statement: no idea what do do here?? Upon choosing 'OK', the 'Oracle RDB ODBC Driver Connect' opens and I am prompted the password. I enter the password and the connection fails. Questions Do I need further programs on my computer, e.g. the Oracle client of Instant client? I am never prompted the port of the server - isn't this relevant? I am never prompted SID - isn't this relevant? I connected from SQL developer easily - it prompted only server IP, port, username, password and SID.

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  • What is the best desktop KVM?

    - by Mat
    What is the best KVM for a programmer? I need to switch between a locked-down corporate box and my development machine rather than between servers. I've used a Black Box four port PS/2 VGA KVM switch for many years, but with the advent of USB-only PCs and DVI I need to upgrade as it doesn't play well with USB to PS/2 converters. My ideal features: USB keyboard and mouse input/output dual monitor switching four ports, but two would do at a push switch on middle mouse click, or from a keyboard hotkey at a pinch

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  • Plesk: Spamassassin ignores emails to redirected accounts

    - by Mat
    When I set up email redirects within Plesk 9.5, Spamassassin ignores all emails sent to the redirected address and only scans emails that are sent directly to the address which has a mailbox. Steps to reproduce Set up two mail accounts: [email protected] as a proper email account with a mailbox and [email protected] with all emails redirected to [email protected]. (It doesn't make a difference, if [email protected] has a mailbox enabled or not.) [email protected] -> [email protected] Set up the spam filter on both accounts. I set mine to delete spam right away, but you can just keep the default ("mark as spam"). Now, when you send an emails to [email protected], it will have Spamassassins tags in the email header, but when you send emails to [email protected], they will end up in the same mailbox but will have no spamassassin tags in the emails header and they will not be scanned. Other notes I am using Plesk 9.5.4 on Ubuntu 8.04 LTS with the default Qmail. I've observed this bug since Plesk 8, but I can't stand it any more and would appreciate any hack or fix.

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  • Internet access using Edimax BR-6204WG as NIC

    - by Mat Richardson
    My internet access at home is provided by Virgin Media via their superhub. I have a laptop with no NIC - however I do have a spare wireless router, the Edimax BR-6204WG, which I have been led to believe can be used to bridge wireless connections. Only problem is, I'm not sure how to go about doing this. The manual for the device is here:- http://www.edimax.co.uk/images/Image/manual/Wireless/BR-6204Wg/BR-6204Wg_Manual.pdf Basically, I want to be able to connect the Edimax wireless router to my laptop using ethernet cable and to use it to pick up the wireless connection from my Virgin superhub. I've managed to get so far in some ways, but then I'm stuck.

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  • How to reformat reStructuredText?

    - by wal-o-mat
    I'm writing reST in vim, which handles line breaks for me (after 80 chars). However, since I frequently go back and edit the text before, lines get ugly again. For example, in tables, it's sometimes annoying to re-format a complete table just because you need a line break in some place. So I wish I had a program that reads my ugly-but-correct reStructuredText and outputs it nicely formatted and wrapped. I found that pandoc in.rst -w rst mostly works, but it has some drawbacks. For example :author: John Doe becomes author John Doe and title formatting is changed as well. Sadly, there seems to be no rst2rst or something similar. Does anyone have some advice?

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  • Setting up a home network

    - by Mat Richardson
    I'm trying to get my head around how to do this with the equipment I have. Here's how it is.. I have an old laptop that has server 2003 installed on it. This has no wireless NIC, but I have a spare wireless router that I can wire to it. We have a virgin wireless router which provides the home with internet access. What I would like to do it make resources on the server 2003 machine available to the rest of the devices in the home - specifically a couple of laptops running windows 7. Ideally I'd like to be able to use the laptop as a fileserver but maybe also offer application virtualization. In the first instance however, I'd like to create a file server with the laptop and allow connections to it by the other machines. Virtualisation is just a 'nice to have'... Given the hardware I have is this possible? Can you point me in the right direction how to do what I want if this is the case?

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  • Install Second Copy of Windows in a Partition, Block Access to other Partitions

    - by Mat
    I want to lend my computer to my flatmate so that he can play some games for which his computer is underpowered. Is it possible to install a second copy of Windows 7 into a separate partition and configure it such that it has no access to the other partitions and disks on the computer, the ones that I use in my main Windows install? I'm not concerned about security, just want to avoid him accidentially messing with my data somehow. Can I do that?

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  • rsync not using forwarded ssh credentials

    - by Mat
    I have a situation where I would like to rsync some files from a remote server to a server in my office. The source server requires key-based authentication and I have an appropriate key set up on my desktop machine. If I ssh into the local server and then ssh to the remote server, ssh agent forwarding works correctly. However, when I try to rsync over ssh I get permission denied. So, Desktop -- Local server -- Remote server. When ssh'd onto the local server ssh user@remote works, but rsync -avPe ssh user@remote:/src /dest does not - Permission denied (publickey).

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  • How to avoid loop limitation in a openvz container?

    - by mat.viguier
    On a openVZ containing Deb7 I need to lock the maximum size of a folder, which is used to upload on a php based web server. The directory is synced, so I have to lock the maxsize. MAXSIZE should be upgradable by adding some physical disk later ... I want to use a file as a block device for a file system. So I have done : dd if=/dev/zero of=/disk2/filesystem.dat bs=1M count=100 Then, I made the filesystem on it mkfs.ext4 filesystem.dat Then I tried to mount it : mkdir /opt/filesystem ; mount /disk2/filesystem.dat /opt/filesystem My OpenVZ (it is on a VPS) has no loop module in the kernerl. So I got Could not find any loop device as usual under OpenVz So i think I have to use FUSE, but I really do not know HOW .... Any idea on locking the size of directory under OpenVZ ?

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  • Windows 7 just deleted 4 days of work

    - by Mat
    Hey! I'm just a bit about to freak out. I just finished a project and rebooted my computer. It didn't want to boot anymore so I had to use the Windows 7 system repair option. It ran for a minute and then booted up. Now most of my source code from the last 4 days of work is gone! Background: sometimes (most often after installing new software) my notebook won't boot up anymore. It will just show the little Windows 7 flag, but not read from the hard disk anymore. If I hard-abort and reboot then, it asks me whether to start Windows normally (which won't work) or to run "Windows startup repair". If I run it, it does some stuff for about two or three minutes and then I can boot Windows again. Usually after this, .exe files I added to the computer during previous days are gone - but other files so far were not touched. But now, after this happened, a whole bunch of ".as" (ActionScript source files) from my project are gone! Does anyone know where and whether there's a way to recover them?

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  • Powerpoint: control image sequence with a slider

    - by Mat
    I have an image sequence (10 images) that step by step visualize the construction of something. I'd like to include these images into my powerpoint presentation in such a way that i can step between them by moving a slider below the image, similar to the timebar of a movie player (in quicktime for example you can step through a move file frame by frame by moving the bar on the bottom). What's the easiest way to do this with Microsoft Powerpoint 2010?

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  • Eigenvector computation using OpenCV

    - by Andriyev
    Hi I have this matrix A, representing similarities of pixel intensities of an image. For example: Consider a 10 x 10 image. Matrix A in this case would be of dimension 100 x 100, and element A(i,j) would have a value in the range 0 to 1, representing the similarity of pixel i to j in terms of intensity. I am using OpenCV for image processing and the development environment is C on Linux. Objective is to compute the Eigenvectors of matrix A and I have used the following approach: static CvMat mat, *eigenVec, *eigenVal; static double A[100][100]={}, Ain1D[10000]={}; int cnt=0; //Converting matrix A into a one dimensional array //Reason: That is how cvMat requires it for(i = 0;i < affnDim;i++){ for(j = 0;j < affnDim;j++){ Ain1D[cnt++] = A[i][j]; } } mat = cvMat(100, 100, CV_32FC1, Ain1D); cvEigenVV(&mat, eigenVec, eigenVal, 1e-300); for(i=0;i < 100;i++){ val1 = cvmGet(eigenVal,i,0); //Fetching Eigen Value for(j=0;j < 100;j++){ matX[i][j] = cvmGet(eigenVec,i,j); //Fetching each component of Eigenvector i } } Problem: After execution I get nearly all components of all the Eigenvectors to be zero. I tried different images and also tried populating A with random values between 0 and 1, but the same result. Few of the top eigenvalues returned look like the following: 9805401476911479666115491135488.000000 -9805401476911479666115491135488.000000 -89222871725331592641813413888.000000 89222862280598626902522986496.000000 5255391142666987110400.000000 I am now thinking on the lines of using cvSVD() which performs singular value decomposition of real floating-point matrix and might yield me the eigenvectors. But before that I thought of asking it here. Is there anything absurd in my current approach? Am I using the right API i.e. cvEigenVV() for the right input matrix (my matrix A is a floating point matrix)? cheers

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  • pointPolygonTest in OpenCV 2.2

    - by Mathieu Dubois
    I wanted to use pointPolygonTest but I have a problem. I'm stuck to OpenCV2.2. I tried to use the code found here: http://docs.opencv.org/doc/tutorials/imgproc/shapedescriptors/point_polygon_test/point_polygon_test.html#point-polygon-test I use findContours to detect contours in an image. Under OpenCV 2.2 returns a vector< vector<Point> >. The problem is that pointPolygonTest accept a matrix as an entry. Therefore the code doesn't compile with OpenCV 2.2: erreur: invalid initialization of reference of type ‘const cv::Mat&’ from expression of type ‘std::vector<cv::Point_<int>, std::allocator<cv::Point_<int> > >’ Under more recent OpenCV versions, the findContours function returns vector<Mat> so it's easy to pass to pointPolygonTest (see the example). I guess I could convert the vector< vector<Point> > to vector<Mat>. Unfortunately the documentation is not very clear about the format. Does anybody have an advice?

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  • Calculating skew of text OpenCV

    - by Nick
    I am trying to calculate the skew of text in an image so I can correct it for the best OCR results. Currently this is the function I am using: double compute_skew(Mat &img) { // Binarize cv::threshold(img, img, 225, 255, cv::THRESH_BINARY); // Invert colors cv::bitwise_not(img, img); cv::Mat element = cv::getStructuringElement(cv::MORPH_RECT, cv::Size(5, 3)); cv::erode(img, img, element); std::vector<cv::Point> points; cv::Mat_<uchar>::iterator it = img.begin<uchar>(); cv::Mat_<uchar>::iterator end = img.end<uchar>(); for (; it != end; ++it) if (*it) points.push_back(it.pos()); cv::RotatedRect box = cv::minAreaRect(cv::Mat(points)); double angle = box.angle; if (angle < -45.) angle += 90.; cv::Point2f vertices[4]; box.points(vertices); for(int i = 0; i < 4; ++i) cv::line(img, vertices[i], vertices[(i + 1) % 4], cv::Scalar(255, 0, 0), 1, CV_AA); return angle; } When I look at then angle in debug I get 0.000000 However when I give it this image I get proper results of a skew of about 16 degrees: How can I properly detect the skew in the first image?

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  • Use jQuery to find and add an image tooltip

    - by lund.mikkel
    Hey people Okay, what I'm trying to accomplish is a simple tool tip that, when you hover over the name of a color, shows a little image of that color. The html markup looks like this: <label class="colorPicker"> <input type="radio" checked="" id="20" value="20" name="id[2]"> <img width="16" height="16" title=" DinoBlack Mat " alt="DinoBlack Mat" src="images/attributes/color/dinoblack_mat.jpg">DinoBlack Mat </label> <label class="colorPicker"> <input type="radio" id="874" value="874" name="id[2]"> <img width="16" height="16" title="XrayBlue shiny" alt="XrayBlue shiny" src="images/attributes/color/xrayblue_shiny.jpg">XrayBlue shiny </label> I'm using the jQuery plugin "Tooltip" and I've added following to my main js-file: $('.colorPicker').tooltip({ track: true, delay: 0, showURL: false, fade: 250, bodyHandler: function() { return $("<img/>").attr("src", [THE SOURCE FOR THE IMAGE]); } }); The idea is simply that the image should be hidden by default. But when you hover over the text the little thumbnail shows up and makes it easy to recognize the color. The problem is I haven't got a clue how to get the src for the thumbnail. I don't know how to extract the src from the img inside the selected element. I've tried various combinations using the this keyword, but nothing seemed to work. I've also tried to add the src path as a rel attribute to the label, but also without any success. Should be needless to say I also control the PHP-output... I really hope you can help me. I've search the web for days without any luck. I'm getting desperate :D /Mikkel Lund

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  • using gsub to modify output of xtable command

    - by stevejb
    Hello, my.mat <- cbind(1:5, rnorm(5), 6:10, rnorm(5)) colnames(my.mat) <- c("Turn", "Draw","Turn", "Draw") print(xtable(my.mat)) yields \begin{table}[ht] \begin{center} \begin{tabular}{rrrrr} \hline & Turn & Draw & Turn & Draw \\ \hline 1 & 1.00 & -0.72 & 6.00 & 0.91 \\ 2 & 2.00 & 0.57 & 7.00 & 0.56 \\ 3 & 3.00 & 1.08 & 8.00 & 0.55 \\ 4 & 4.00 & 0.95 & 9.00 & 0.46 \\ 5 & 5.00 & 1.94 & 10.00 & 1.06 \\ \hline \end{tabular} \end{center} \end{table} I want to filter out the \begin{table} and \end{table} lines. I can do this using gsub, but how to I get the results of print(xtable(... into a variable? Thanks for the help Stack Overflow R community!

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  • R: Are there any alternatives to loops for subsetting from an optimization standpoint?

    - by Adam
    A recurring analysis paradigm I encounter in my research is the need to subset based on all different group id values, performing statistical analysis on each group in turn, and putting the results in an output matrix for further processing/summarizing. How I typically do this in R is something like the following: data.mat <- read.csv("...") groupids <- unique(data.mat$ID) #Assume there are then 100 unique groups results <- matrix(rep("NA",300),ncol=3,nrow=100) for(i in 1:100) { tempmat <- subset(data.mat,ID==groupids[i]) #Run various stats on tempmat (correlations, regressions, etc), checking to #make sure this specific group doesn't have NAs in the variables I'm using #and assign results to x, y, and z, for example. results[i,1] <- x results[i,2] <- y results[i,3] <- z } This ends up working for me, but depending on the size of the data and the number of groups I'm working with, this can take up to three days. Besides branching out into parallel processing, is there any "trick" for making something like this run faster? For instance, converting the loops into something else (something like an apply with a function containing the stats I want to run inside the loop), or eliminating the need to actually assign the subset of data to a variable?

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  • OpenCV. cvFnName() works, but cv::FunName() doesn't work

    - by Innuendo
    I'm using OpenCV to write a plugin for a simulator. I've made an OpenCV project (single - not a plugin) and it works fine. When I added OpenCV libs to the plugin project, I added all libs required. Visual Studio 2010 doesn't highlight any code line with red. All looks fine and compiles fine. But in execution, the program halts with a Runtime Error on any cv::function. For example: cv::imread, or cv::imwrite. But if I replace them with cvLoadImage() and cvSaveImage(), it works fine. Why does this happen? I don't want to rewrite the whole script in old-api-style (cvFnName). It means I should change all Mat objects to IplImages, and so on. UPDATE: // preparing template ifstream ifile(tmplfilename); if ( !FILE_LOADED && ifile ) { // loading template file Mat tmpl = cv::imread(tmplfilename, 1); // << here occurs error FILE_LOADED = true; } Mat src; Bmp2Mat(hDC, hBitmap, src); TargetDetector detector(src, tmpl); detector.detectTarget(); If I change to: if ( !FILE_LOADED && ifile ) { IplImage* tmpl = 0; tmpl = cvLoadImage(tmplfilename, 1); // no error occurs } And then no error occurs. Early it displayed some Runtime Error. Now, I wanted to copy exact message and it just crashes the application (simulator, what I am pluginning). It displays window error - to kill process or no. (I can't show exact message, because I'm using russian windows now)

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