Prime sieve

A prime sieve or prime number sieve is a fast type of algorithm for finding primes.

some cool prime sieves:

1. Sieve of Sundaram

2. Sieve of Eratosthenes

more poems

its like 10 inches snow outside and i'm in the mood of reading poems again :D
read the full version here.

তোমার আমার মাঝখানেতে

     একটি বহে নদী ,

দুই তটেরে একই গান সে

     শোনায় নিরবধি ।

Khonek dekha by Rabindranath Tagor

যেমন ঢাকা ছিলে তুমি

         তেমনি রইলে ঢাকা ,

তোমার কাছে যেমন ছিনু

          তেমনি রইনু ফাঁকা !

          তবে কিসের তরে        

          থামলে লীলাভরে

যেতে যেতে পাড়ার পথে

           কলস লয়ে কাঁখে ?

একটুখানি ফিরে কেন

           দেখলে ঘোমটা - ফাঁকে ?

if you are interested, read the full poem here

mac svn commands

#-----------------
# start svn server
#-----------------
sudo -u www /sw/bin/svnserve -d -r /Users/al/svnrepo

#-------------------
# checkout a project
#-------------------
svn checkout svn://localhost/project1

libpng.so.2 error

***: error while loading shared libraries: libpng.so.2:
cannot open shared object file: No such file or directory

To avoid this error:

1. Install libpn3:

sudo apt-get install libpng3

2. And rename it to libpng2:

sudo ln -s /usr/lib/libpng.so.3 /usr/lib/libpng.so.2

Thanks to Jacques for the solution.

Search for Extra-Terrestrial Intelligence (SETI) project

SETI@home is a scientific experiment that uses Internet-connected computers in the Search for Extraterrestrial Intelligence (SETI). You can participate by running a free program that downloads and analyzes radio telescope data.

Learn about the SETI project->wiki, SETI@home

player/stage/gazebo help

http://yorkroboticist.blogspot.com/2009_11_01_archive.html


and a tutorial Player/stage tutorial

SLAM tutorial : SLAM
Excellent slam example: slam for dummies

didn't find any example for player/stage 3.*, so i installed player 2.0.5, and stage 2.0.3

got the following error

unable to open color database /usr/X11R6/lib/X11/rgb.txt :
No such file or directory (stage.c stg_lookup_color)

To correct this problem, player/stage needs a link to the X11 color map in the place it expects:

sudo ln -s /usr/X11/share/X11/rgb.txt /usr/X11R6/lib/X11/rgb.txt

detailed solution: here

Java client for player/stage: here

--
Sheetal

Super cool panaromas!!!

Click on the pictures to see the 360 degree views.
the moon
seven wonders

DNS security flaws

full story

In practice the DNS service behaves very much like the /etc/hosts file on your computer, which is where the system initially looks up name resolutions before relying on the DNS system. The file is basically a list of IP addresses followed by the name you've associated with those IP addresses. For example, if you edit the file you can associate any domain name with any IP address of your choosing.

1. Open Terminal and enter the following command to edit the hosts file

sudo pico /etc/hosts

2. Go to the bottom of the file and enter the following:

74.125.19.106 www.apple.com

3. Press control-o followed by the return key to save the file

acid test for browser

http://acid3.acidtests.org/

sshkeychain installation problem on leopard

SSHKeychain 0.8.2 Post Install Problem on Leopard

security issues with safari

http://support.apple.com/kb/HT3949

How to do print screen in Mac OS X

see here

full screen: command key + Shift + 3
selected screen: command key + Shift + 4, then mouse will look like "+" sign, then choose selected region.

animation of lens theorem derivation

http://hirophysics.com/Anime/thinlenseq.html

Google Honors Anniversary of Bar Code Patent Awarded to Drexel Alumnus, Faculty Member

On Wednesday, October 8, 2009, Google celebrated the 57th anniversary of the first bar code patent by changing the logo on its Web site with a black and white bar code design.

Drexel alumnus Norman Woodland (above) CoE '47, Hon. '98, and faculty member Bernard Silver received the first patent (U.S. Patent # 2,612,994) for their bar code on October 7, 1952. The bar code created by Woodland and Silver was comprised of a series of concentric circles, not the black and white vertical lines used currently.

Read bangla newpaper on mac

This firefox extension converts  some Old Bangla Newspaper Website to Unicode 4.2.
You need unicode installed on you machine. Download unicode for mac here
It was for old firefox versions.
To make it run on your new firefox, you can download the xpi file------>rename it to zip ----> unzip it ----> change maxVersion attribute in the install.rdf file to 3.* ----> then again zip it ----> rename to xpi.

OR

just download and install this 


--
Sheetal

--A journey of a thousand miles begins with a single step --

Install windows on mac

This one is on sun virtual box
http://www.youtube.com/watch?v=YhTb_7TSDXQ&feature=related

upload and send large files

http://www.uploadandsend.com/#

--
Sheetal

--A journey of a thousand miles begins with a single step --

Edit distance in java

Edit distance