I am using GROMACS 5.1.4 to simulate water in contact with a surface. I am only interested to calculate some properties of water near the surface. Let's say at a distance of x nm from the surface. How can I modify my gromacs trajectory file such that it has only the coordinates of atom in that region less than x nm (perpendicular to the surface). In other words, I want to collect all the frames of the trajectory with the updated coordinates of the atom only in that region for each frame?



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