[R] How to make sub-headers in R

Liao, Hongsheng HLiao at odu.edu
Fri May 15 15:55:17 CEST 2015

I know how to make one-row header for a data frame using "colnames".  Is there any function to insert sub-header between the first row of the data and the header?  Thanks

Hongsheng (Hank) Liao, PhD.
Lab Manager
Center for Quantitative  Fisheries Ecology
Old Dominion University

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