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module procedures_box_size use, intrinsic :: iso_fortran_env, only: DP => REAL64 implicit none private public :: max_distance, edge contains !> \[ r_\text{max} = \frac{\sqrt{3}}{2} L \] !> @note A 3D box is assumed. pure real(DP) function max_distance(box_size) real(DP), intent(in) :: box_size(:) max_distance = sqrt(3._DP) / 2._DP * box_size(1) end function max_distance !> @note This function seems silly. How to slice a result of a function (which is an array)? pure real(DP) function edge(box_size) real(DP), intent(in) :: box_size(:) edge = box_size(1) end function edge end module procedures_box_size