I have what I hope is an easy question about default parameters. The input variable help specifies that for the keyword “d3e_pert1_atpol”, the following applies
d3e_pert1_atpol
*Mnemonics:* 3rd Derivative of Energy, mixed PERTurbation 1: limits of ATomic POLarisations
*Mentioned in topic(s):* [topic_nonlinear](https://docs.abinit.org/topics/nonlinear)
*Variable type:* integer
*Dimensions:* (2)
*Default value:* [1, 'natom']
*Only relevant if:* [optdriver] == 5 (non-linear response computations)
*Added in version:* before_v9
If I have a large number of atoms, say 64, how do I specify this. Looking at the documentation above, it would seem that I could simply write “d3e_pert1_atpol” by itself on a line and abinit would then assume the default of all atoms in the system. Doing so, however, leads to an error. How does the default work?
I assume that if I specify
“d3e_pert1_atpol 1 64” then all 64 atoms would be included. Is this correct?