As well as 'EvsLC', a similar functionality is provided as

MD.Type DF

by which OpenMX automatically calculates the total energy of the system with volumes of -6, -4, -2, 0, 2, 4, and 6 %, where the original structure given in the input file is taken to be the reference. The regulation of volume is simply performed by considering uniform change of lattice vectors,

2016-04-03