[R] Equivalent of Nothing (in VBA) or [] in Matlab in R

[lm]

Hi, I am very new to R so please excuse me if I am asking very obvious
questions.

I am trying to call a blackbox api function implemented in as a COM object
from R. The function definition says that 

1. if calling from VBA, the first parameter should be set to "Nothing"
2. if calling from matlab, the first parameter should be set to []

What should be the equivalent for above in R?.

Thanks
lm 

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