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How to 32 bit OS or 64 bit machine

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To get the machine type: uname -m x86_64 (64 bit) i686      (32 bit) You can also use the cammand ' arch '. For more detail...

Density Functional Theory

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In December 1926, Schroedinger published his seminal paper titled " An Undulatory Theory of the Mechanics of Atoms and Molecules ...

Checking the status of the submitted job in HPC

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The submitted jobs in PBS queue system can be checked whether they are in queue still, or running, or completed, etc. The command to use (i...

Git and GitHub Tutorial

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What is a version control and usage? When we write a project with a number of files, it is not easy to maintain. Some times, we might hav...

Best sites for Physics (and other things) Discussion

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Stack Exchange (for basic questions) Stack Exchange Overflow sites (for advanced questions) Physics Forums Socratic  Reddit

Commonly used Unix/Linux commands

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Here are the mostly used command in command line. To see more details, click on each commad. ls grep alias reverse search tab completi...

Efficient use of grep command

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The command grep can be used in following ways. grep "HELLO"  *    (to print the match lines) grep -v "HELLO...

Install important numerical libraries in Ubuntu

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To install fftw, blas, lapack etc. sudo apt - get install fftw3 fftw3 - dev pkg - config sudo apt-get install libblas-dev liblapack-dev...

AWK tutorial

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Sed and AWK are powerful yet simple programming languages. The simple format to use awk is awk '{print}' fileName.txt awk ...

Problems in dimers

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There are a number of interesting and challenging problems that are unsolved yet. At the first instance, these problems may seem simple, bu...