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Dear all. I am a beginer of VASP. I want to calculate polarization by berry-phase method. As the manual says, dipol is the center of the cell, so is the way to calculate the center shown below correct ?

r_{+} = \Sum_{i} Z_{i} *r_{i} /\Sum_{i} Z_{i}
for (plus charge ion : i run for plus ion)

and

r_{-} = \Sum_{i} Z_{i} *r_{i} /\Sum_{i} Z_{i}
for (minus charge ion : i run for minus ions r_{i} is minus ion position)

and the center of dipole r_{0} is just the center of plus ion cnter r_{+}
and minus ion center r_{-},

r_{0} = 0.5 * (r_{+} + r_{-})

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