Read or modify package-internal numerical options. The option
GLOBAL_DX controls the finite-difference step used by
dcm_diff.
rsdcm_options(...)The current option list, invisibly when setting values.
old <- rsdcm_options()$GLOBAL_DX
rsdcm_options(GLOBAL_DX = 1e-4)
rsdcm_options(GLOBAL_DX = old)