tag:blogger.com,1999:blog-4574544795099180957Fri, 08 Nov 2024 15:31:21 +0000pythonsudokujavalinuxsshMATLABXMPPmathAlgorithmsBacktrackingGame theoryGrundy.Image ProcessingLEDNimP-N positionsPropagation ConstraintSmackawkbashcountingderangementfibonaccigaussian distributiongenerating functiongoogle app enginekeyboardmarkov chainmonitoringmultithreadingpingport scannerpower seriespygamersyncscpsystem administrationvbscripttwo anonymous sharing their anonymous explorations... this blog is about things that held our attention for long enough to make us write about it...http://develworkshop.blogspot.com/noreply@blogger.com (rahul)Blogger22125tag:blogger.com,1999:blog-4574544795099180957.post-1690068060966867798Mon, 25 Feb 2013 21:19:00 +00002013-02-25T13:19:55.948-08:00awkgaussian distribution Hi all, It has been ages. We have moved out of college, and are living in different places. So, no more regular night long discussion about random stuffs. Things were getting awkward and I am trying to get them back to normal. Now, I don't remember whether I read it somewhere, or my friend told me about it, or my friend told me about reading it somewhere. However, I do remember that hidden http://develworkshop.blogspot.com/2013/02/awk-gauss-and-coin-toss.htmlnoreply@blogger.com (UtsavB)0tag:blogger.com,1999:blog-4574544795099180957.post-2901835409407679979Wed, 11 Apr 2012 11:18:00 +00002012-04-11T06:43:33.880-07:00bashlinuxpythonrsyncRecently I submitted my assignment for Distributed System class. I took it too lightly ,and so procrastinated. I started working on it in the 11th hour ,and quickly realized how much FUBAR my situation was. I set up a team of  two Ubuntu virtual machines on my system, and connected them using virtual LAN. 135 lines later I apparently had something which bore a slight resemblance to the thinghttp://develworkshop.blogspot.com/2012/04/syncing-files-of-two-folders-in.htmlnoreply@blogger.com (UtsavB)0tag:blogger.com,1999:blog-4574544795099180957.post-4254834495085433874Sat, 03 Mar 2012 20:42:00 +00002012-03-04T02:17:15.699-08:00fibonaccigenerating functionmathpower series While reading about Fibonacci series, I came across the formula which gives the Fibonacci number using golden ratios. I was curious about how did such an equation was derived and how could it give the answer so correctly. This problem introduced me to the world of generating function. I will start with a few definitions. A formal power series is an expression of the forma0 +http://develworkshop.blogspot.com/2012/03/fibonacci-power.htmlnoreply@blogger.com (UtsavB)0tag:blogger.com,1999:blog-4574544795099180957.post-6321170224557916120Wed, 29 Feb 2012 20:41:00 +00002012-02-29T13:01:59.172-08:00countingderangementmath Imagine a movie show is sold out. The viewers don't sit in the seats indicated by the tickets, but chose their seats randomly. What is the probability that atleast one guy sits on the correct seat? For that we need to first know what is the total number of permutations possible ( which is N! ), and what is the total number of permutations where none of the viewers take their designated seats, http://develworkshop.blogspot.com/2012/02/lets-get-deranged.htmlnoreply@blogger.com (UtsavB)0tag:blogger.com,1999:blog-4574544795099180957.post-2723665646569333488Tue, 28 Feb 2012 16:24:00 +00002012-03-23T01:18:32.902-07:00AlgorithmsGame theoryGrundy.NimP-N positions Hello again,  If I had to say one thing I learned most from my school pal Mridul, I would say it was his way of keeping an organised record of things that were important to him. He maintained a journal of all the bikes and cars he dreamed of owning, all pens he had (there were 100s of them), B'days, tele. no. and address of his all his classmates ....... He was referred to as the most http://develworkshop.blogspot.com/2012/02/algorithmic-games-part-1-of-n.htmlnoreply@blogger.com (rahul)0tag:blogger.com,1999:blog-4574544795099180957.post-4596323442226696983Thu, 22 Dec 2011 16:48:00 +00002012-02-11T04:21:04.242-08:00markov chainpython and then at the end of every line: 'Speak roughly to your tea; it's getting late.' So Alice began to tremble. Alice looked round, eager to see if she were looking over their shoulders, that all the jurymen on to himself as he said in a solemn tone, only changing the order of the jurors were all crowded round it, panting, and asking, 'But who is to do this, so she began again: 'Ou est ma chatte?'http://develworkshop.blogspot.com/2011/12/markov-chains-or-random-text-generation.htmlnoreply@blogger.com (UtsavB)0tag:blogger.com,1999:blog-4574544795099180957.post-8529788315929061511Wed, 21 Dec 2011 07:00:00 +00002012-01-04T05:34:27.014-08:00MATLABsudoku Hello. In this post, I will discuss about the first few phases of the work. The system needs lots of improvements, which include technology used and the approach followed. Anyways, it was all part of a learning process. First the image is converted to greyscale, then thresholding is performed on the image and we obtain a binary image. Thresholding can be used to distinguish background from http://develworkshop.blogspot.com/2011/12/sudoku-solver-or-how-to-solve-sudoku_3722.htmlnoreply@blogger.com (UtsavB)1tag:blogger.com,1999:blog-4574544795099180957.post-1786876307082767269Tue, 20 Dec 2011 08:25:00 +00002012-02-27T05:42:50.133-08:00pythonsudoku Hi friends, This post as promised is a detailed explanation of the working and code of the functions explained in  previous post (Part 1). So here it goes: The first function was __init(): which initialized the sudoku from the sequence  (like seq='003000000400080036008000100040060073000900000000002005004070062600000000700600500 ')  to the sudoku board and called the update http://develworkshop.blogspot.com/2011/12/sudoku-solver-or-how-to-solve-sudoku_20.htmlnoreply@blogger.com (rahul)0tag:blogger.com,1999:blog-4574544795099180957.post-5062867753395311951Sun, 11 Dec 2011 14:56:00 +00002012-01-04T05:34:27.006-08:00pythonsudoku Hi felas , This post is the discription of my way of solving a sudoku (in code). Both Utsav and I were eager to code the solver for sudoku and so we both have have our own version of Sudoku Solver. Since both of these codes were base on backtracking ,they are similar in there basic approach but differ in implementation  . My code is in python using a DDA (or Double Dimensional list as they http://develworkshop.blogspot.com/2011/12/sudoku-solver-or-how-to-solve-sudoku_11.htmlnoreply@blogger.com (rahul)0tag:blogger.com,1999:blog-4574544795099180957.post-5199013072384265223Sat, 10 Dec 2011 16:07:00 +00002011-12-13T08:39:46.582-08:00BacktrackingImage ProcessingMATLABPropagation Constraintpythonsudoku Hi. Its been a while since we made any post. Well, nothing held our attention long enough can be the excuse. There were games to complete, tournaments to win lose, fests to perform in, lots of series to watch, and exams to appear for. Bob Dylan said that "the answer, my friend, is blowing in the wind", and likewise to look for our answers, we changed our direction with the wind and kind of http://develworkshop.blogspot.com/2011/12/sudoku-solver-or-how-to-solve-sudoku.htmlnoreply@blogger.com (UtsavB)0tag:blogger.com,1999:blog-4574544795099180957.post-5371431772784520697Sun, 10 Jul 2011 12:39:00 +00002011-07-10T16:26:53.648-07:00javamultithreadingport scannerBack in my sixth semester Computer Networks lab, we had to write a simple port scanner (port 0 to 1024). The basic principle was to see whether a connection could be made at a port. If connection can be made, it is open, or else it is closed. I had used the following code then. However, it took 17 minutes to perform the scan. import java.io.IOException; import java.net.InetAddress; http://develworkshop.blogspot.com/2011/07/simple-port-scanner.htmlnoreply@blogger.com (UtsavB)0tag:blogger.com,1999:blog-4574544795099180957.post-4157372186085497087Tue, 05 Jul 2011 00:55:00 +00002011-07-04T18:16:31.449-07:00scpsshscp is a useful command. It works on top of ssh. To transfer file from local to remote:scp sourcefile user@remoteserver:/path_target/To transfer from remote to local:scp user@remoteserver:/path_source/sourcefile /path_target/Note: if the target is current directory then '.' can be used as in scp user@remoteserver:/path_source/sourcefile .if the target is the parent directory http://develworkshop.blogspot.com/2011/07/scp-or-how-to-securely-transfer-files.htmlnoreply@blogger.com (UtsavB)0tag:blogger.com,1999:blog-4574544795099180957.post-3376594153858462305Mon, 04 Jul 2011 12:34:00 +00002011-07-05T07:00:32.952-07:00pingI learnt about these commands in my Computer Network classes. I didn't know about these commands initially. Well, I am still learning. One of the commands is Ping: Packet Internet Groper. Imagine a sonar. Ping is similar. Also, sonar makes a ping sound. Here is a site dedicated to the ping. An interesting introduction can be found there. The way this works is the computer or device will http://develworkshop.blogspot.com/2011/07/network-commands-incomplete.htmlnoreply@blogger.com (UtsavB)0tag:blogger.com,1999:blog-4574544795099180957.post-1365033434478326323Sat, 02 Jul 2011 16:01:00 +00002011-12-21T00:11:49.312-08:00google app enginepythonXMPP This is the script i used to message to many of my friends at a time from google.appengine.api import xmpp from google.appengine.ext import webapp from google.appengine.ext.webapp.util import run_wsgi_app from google.appengine.ext.webapp import xmpp_handlers user1="%s said:" dirc=[] class XMPPHandler(xmpp_handlers.CommandHandler):     def text_message(self, message=http://develworkshop.blogspot.com/2011/07/shoutout-using-google-app-engine-to.htmlnoreply@blogger.com (Unknown)0tag:blogger.com,1999:blog-4574544795099180957.post-6171266521155364083Sat, 02 Jul 2011 14:50:00 +00002012-03-09T11:10:02.217-08:00javaSmackXMPPHi. It's been a while since I worked with the Smack API.... 6 months and so I might have forgotten many things. Anyways, it is a brief introduction to XMPP and more specifically to Smack API. It provides Java libraries for playing around with XMPP. The above snippet will connect to the gmail server and make an status update. Presence presence =new Presence(Presence.Type.available,http://develworkshop.blogspot.com/2011/07/xmpp-or-how-to-programatically-do.htmlnoreply@blogger.com (UtsavB)0tag:blogger.com,1999:blog-4574544795099180957.post-7771110248094633933Sat, 02 Jul 2011 11:49:00 +00002011-07-02T05:09:11.715-07:00linuxmonitoringsystem administrationThis is just an overview of few of the system administration tools. Infos about what programs are running, how much memory or how much cpu cycles are being used, who are logged in and for how long.  top: it provides a lot of information about the processes running, percentatage of the cpu and th ememory being consumed by that process, who owns the process and its Process ID. It also shows http://develworkshop.blogspot.com/2011/07/system-monitoring-basics.htmlnoreply@blogger.com (UtsavB)0tag:blogger.com,1999:blog-4574544795099180957.post-5612038891359038603Fri, 01 Jul 2011 23:33:00 +00002011-07-01T17:12:05.022-07:00sshThe SSH Daemon act like a server and listens for and handles any incoming connection.  To install ssh daemon in Ubuntu: sudo apt-get install openssh-server Assuming the OpenSSH client is also installed already, ssh localhost to check whether the daemon is working properly. To start the server sudo /etc/init.d/ssh start To stop the server sudo /etc/init.d/ssh stop To restart the http://develworkshop.blogspot.com/2011/07/ssh-daemon-or-setting-up-ssh-server.htmlnoreply@blogger.com (UtsavB)0tag:blogger.com,1999:blog-4574544795099180957.post-1752792474039625184Fri, 01 Jul 2011 20:39:00 +00002011-07-01T15:06:05.250-07:00linuxThe original page went down around 2007. It belonged to Clark College Linux User Group. Found it in the waybackmachine.org You can check out this. The link redirects to the archive where the page is stored. Use  man command for more information on the commands. Console Commands Utility or CommandUse/Description passwdChanges password nslookupQueries Internet domain name servers http://develworkshop.blogspot.com/2011/07/some-linux-commands.htmlnoreply@blogger.com (UtsavB)0tag:blogger.com,1999:blog-4574544795099180957.post-8321490868237524643Thu, 30 Jun 2011 11:25:00 +00002011-06-30T05:43:16.523-07:00My friends and I were trying to figure out how to send requests. We were kind of late enough to miss the "send invite" active phase. Thanks to Anjali, figured out what to do... Add people you want to invite to a circle Make a post and add the circle OR just make a post and share the post with the email-ids Byeshttp://develworkshop.blogspot.com/2011/06/google-invites.htmlnoreply@blogger.com (UtsavB)0tag:blogger.com,1999:blog-4574544795099180957.post-4982769674405112043Sat, 25 Jun 2011 08:47:00 +00002011-07-01T14:59:24.032-07:00ssh I started using ssh only few weeks back and slowly I realized what I had been missing all the time. According to Wikipedia: Secure Shell or SSH is a network protocol that allows data to be exchanged using a secure channel between two networked devices. The two major versions of the protocol are referred to as SSH1 or SSH-1 and SSH2 or SSH-2. Used primarily on Linux and Unix based systems to http://develworkshop.blogspot.com/2011/06/ssh.htmlnoreply@blogger.com (Unknown)1tag:blogger.com,1999:blog-4574544795099180957.post-1405615876838365254Fri, 24 Jun 2011 18:18:00 +00002011-12-13T06:18:25.171-08:00pygamepython My aim with this tutorial is to share the experience i had of designing a 2-D FPS inPython. I will try and be as precise as i can and the the same time not go into theunnecessary details.Devel's Requirements Windows platform with python 2.4/2.5/2.6(I used Python 2.5) Pygame : this provides you with the basic functions to handle events like mouse click, key press. (I used Pygame 1.9.1http://develworkshop.blogspot.com/2011/06/shoot-bonkars-simple-2-d-fps-game.htmlnoreply@blogger.com (rahul)0tag:blogger.com,1999:blog-4574544795099180957.post-8200227068461566276Fri, 24 Jun 2011 13:30:00 +00002011-06-29T18:05:08.166-07:00javakeyboardLEDpythonvbscript Here is a simple script to make a keyboard's LED blinkCopy the script below and save it as .wsf Rem blinking LED :vstsv <package>   <job id="vbs">      <script language="VBScript">         set WshShell = WScript.CreateObject("WScript.Shell")           For count=0 to 10  &http://develworkshop.blogspot.com/2011/06/flashing-keyboard-leds.htmlnoreply@blogger.com (Unknown)1