[R] logical indexing multidimensional arrays

[Steve Jaffe]

Suppose I have an n-dimensional array and a logical vector as long as the
first dimension. I can extract an n-dimensional subarray with 
  a[ i, , , , .. ,] where there are n-1 commas (ie empty indices)

Is there an alternative notation that would better lend itself to more
generic use, e.g. to write a function that takes 'a' and 'i' and returns
a[i, , , .. ,]?

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