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  when it will be a one-dimensional array.
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  when it will be a one-dimensional array.
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  The most common form of indexing a \eqn{k}-dimensional array is to
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  The most common form of indexing a \eqn{k}-dimensional array is to
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  specify \eqn{k} indices to \code{[}.  As for vector indexing, the
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  specify \eqn{k} indices to \code{[}.  As for vector indexing, the
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  indices can be numeric, logical, character, empty or even factor.
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  indices can be numeric, logical, character, empty or even factor.
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  And again, indexing by factors is equivalent to indexing by the
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  numeric codes, see \sQuote{Atomic vectors} above.
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  An empty index (a comma separated blank) indicates that all entries in
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  An empty index (a comma separated blank) indicates that all entries in
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  that dimension are selected.
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  that dimension are selected.
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  The argument \code{drop} applies to this form of indexing.
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  The argument \code{drop} applies to this form of indexing.
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  A third form of indexing is via a numeric matrix with the one column
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  A third form of indexing is via a numeric matrix with the one column