Dear All,
I would like to obtain the second derivative of the total force
d^2f_i/dr_i^2 at every atom i along the trajectory. In principle, this can be
obtained from the Hessian matrix. However, I don't need the cross terms like
d^2f_i/dr_i dr_j, therefore it will be very time consumming to calculate
the Hessian matrix along the trajectory if I just need the off-diagonal
terms. Does anyone know a way to do that? Thanks.
Phuong
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