jkDimSum takes a three dimensional integer vector, fixes the value
of the first dimension, and then sums the values of all the
entries in the vector with that value for its first dimension.
1  | jk_dim_sum(n, i)
 | 
n | 
 A three dimensional integer vector.  | 
i | 
 An integer that is a valid index of the first dimension of
  | 
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