Hi R-helpers,

I have a dataframe (called data) with trees in rows (n=100) and insect
species (n=10) in columns. My tree IDs are in a column called TREE and each
species has a column labeled SPEC1, SPEC2, SPEC3, etc...

I wish to randomize the values in my dataframe such that row and column
totals are held constant, i.e. in my randomized data each tree will have the
same number of individual insects as in the real data (constant row totals)
and each species will have the same number of individuals as in the real
data (constant column totals).

I will eventually want to do this many times, but I would appreciate help
getting started with the randomization.

Thank you, Mark Na

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