Read or modify package-internal numerical options. Currently the only
option is GLOBAL_DX, the finite-difference step used by
dcm_diff when computing numerical Jacobians.
rsdcm_options(...)The current option list (invisibly when setting).
rsdcm_options() # show current options
#> $GLOBAL_DX
#> [1] 0.0003354626
#>
rsdcm_options(GLOBAL_DX = 1e-4) # widen the FD step
rsdcm_options(GLOBAL_DX = exp(-8)) # restore default