[R] array slice notation?

[Steve Jaffe]

Suppose I have an n-diml array A and I want to extract the first "row" -- ie
all elements A[1, ...]

Interactively if I know 'n' I can write A[1,,,,,] with (n-1) commas. 

How do I do the same more generally, eg in a script?

(I can think of doing this by converting A to a vector then extracting the
approp elements then reshaping it to an array, but I wonder if there isn't a
more straightforward approach)
Thanks

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