Creating a PBS script A PBS script is a text file that contains the information that PBS needs to set up the job, followed by the commands to be executed. In the PBS script, the lines beginning with “#PBS” are PBS directives that specify the resource requirements and various other attributes of the job. Note that the directives must come first in the script as any directives after the first executable statement are ignored. Since the R program we will be running doesn't require any interaction, we want to submit the job to the batch queue. In this example, the job we will be running has the following requirements: · the job will need 1 node, 10 processors and 64 GB of RAM · the job will not require more than 48 hours to complete · the name of the job will be 'myscript', with the output written to myscript.out and errors written to myscript.err · we want email notifications to be sent to your_email@abc.edu when the job starts and stops
Density Functional Theory (DFT) is a computational quantum mechanical modeling method used in chemistry, physics, and materials science to investigate the electronic structure (the distribution of electrons) of molecules and solids. Here's a basic overview of how DFT calculations of molecules work: 1. **Formulation of the Problem**: In DFT, the problem is formulated as finding the electronic density that minimizes the total energy of the system. The electronic density is a function of position and represents the probability of finding an electron at a particular location. 2. **Approximations**: DFT involves several approximations, the most notable being the exchange-correlation functional. This functional captures the effects of electron-electron interactions, including exchange (the antisymmetry of the wave function) and correlation (the classical electrostatic repulsion between electrons). 3. **Choice of Basis Set**: In practical calculations, the electronic wavefunctions