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how to choose parameter of prec

Posted: Sun Mar 19, 2017 3:12 am
by weiyidan
dear professor,
i find the results of normal and accurate are not same. therefore, i am wondering about how to choose this parameter.
1.is the prec the same as the one of Structural optimization´╝č
2.for Clneb, the accurate is better than normal? (the manual of vasp says 'PREC=Accurate increases the memory requirements somewhat, but it
should be used if very accurate forces (phonons and second derivatives) are required')

thanks for attention and reply.