Endsems..

I had been not able to post here as my semester end exams are going on….
So will be back when these are over…..

State of the Blogosphere

David Sifry posted Sifry’s Alerts: State of the Blogosphere, April 2006 Part 1: On Blogosphere Growth at technorati weblog:

The State of the Blogosphere is strong. The blogosphere is over 60 times bigger than it was only 3 years ago.
The Facts:

The blogosphere tracked by technorati is doubling about every 6 months, as the chart below shows:

read more

graph plotting with gnuplot

Gnuplot is a free, command-driven, interactive, function and data plotting program.
Here i’ m providing a quick reference guide for plotting graphs (as many of us don’t bother to go in detailed documentation).
On Unix/Linux systems start Gnuplot by simply typing:
gnuplot

first the formal syntax :

plot {[ranges]}
{[function] | {“[datafile]” {datafile-modifiers}}}
{axes [axes] } { [title-spec] } {with [style] }
{, {definitions,} [function] …}

To plot functions simply type: plot [function] at the gnuplot> prompt
gnuplot> plot sin(x)
gnuplot> splot sin(x*y/20)
gnuplot> plot sin(x) title ‘Sine Function’, tan(x) title ‘Tangent’

Now for plotting data points firstly data points should be written in text file with axis ranges as columns.Data files should have the data arranged in columns of numbers. Columns should be separated by white space (tabs or spaces) only, (no commas). Lines beginning with a # character are treated as comments and are ignored by Gnuplot. A blank line in the data file results in a break in the line connecting data points. ‘
Plotting a graph from data file “plot.data” , do
gnuplot>plot “plot.data”

Now customizing the plot :


set xlabel “x-axis data” # will set a label “x-axis data” in graph
set ylabel “y-axis data”
set title “x vs y” # will set title for graph
set xrange [0.001:0.005] # Change the x-axis range:
set yrange [20:500] # Change the y-axis range:
set logscale # plot using log scale
set autoscale #let gnuplot determine ranges
plot “file.data” with lines #will join data points with lines
plot “file.data” smooth csplines with lines #will join plot graph using smooth curves

Gnuplot can mathematically modify your data column by column:
to plot sin( col.3 + col.1 ) vs. 3 * col.2 type:

plot ‘force.dat’ using (3*$2):(sin($3+$1))

To print graph (this will store graph in post script(.ps) file do this before plotting graph:

set output “graphs.ps”
set terminal postscript
plot “file.data” using lines

This will save the graph in graph.ps
For more help type ‘help’ in gnuplot mode :
gnuplot>help

somelinks
www.duke.edu/~hpgavin/gnuplot.html
A simple guide to GNU plot
Introduction to GNU plot

Useful Windows XP DOS Commands & Tricks

Typing DOS commands on the Windows Command Line prompt is a most efficient and faster way of doing things in Windows XP. Here’s a run-down of the most useful DOS commands available in Windows XP. Some of these DOS commands even do not have an visual alternative. Digital Inspiration has a nice roundup of 10 very useful commands and tricks that can help you get things done quickly from the command line.
Useful Windows XP DOS Commands & Tricks [Digital Inspiration]

Related resources on Microsoft Website:
List of DOS Commands with Examples

Phishing

Now a days, phishing cases had increased so here is brief writeup to give insight a about phishing . Read Wikipedia to know about phising examples.
Phishing is a technique used to gain personal information for purposes of identity theft, using fraudulent e-mail, instant messages that appear to come from legitimate site. These authentic-looking messages are designed to fool recipients into divulging personal data such as account numbers and passwords, credit card numbers and Social Security numbers.

why phishing works :

Techniques used within Phishing emails:

Preventing Phising :


Some Latex tips & Links

Here are some quick tips and links which you can find useful when writing some report, article in latex.

Firstly here is an nice article explaining why latex is good .
Here are some editors available for latex:
For Linux :

For windows :

Getting to grips with Latex
Getting Started with LaTeX
LaTeX Tutorial : some templates here
LaTeX Tips and Tricks