After subsetting a LongTable, it is possible that values of rowKey or colKey could no longer be present in the object. As a result there the indexes will no longer be contiguous integers. This method will calcualte a new set of rowKey and colKey values such that integer indexes are the smallest set of contiguous integers possible for the data.
## S4 method for signature 'LongTable' reindex(object)
The ['LongTable'] object to recalcualte indexes (rowKey and colKey values) for.
A copy of the ['LongTable'] with all keys as the smallest set of contiguous integers possible given the current data.
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