Why not just melt and dcast the data.table?
require(data.table)
dcast(melt(mydata, id.vars = "col0"), variable ~ col0)
# variable row1 row2 row3
# 1: col1 11 21 31
# 2: col2 12 22 32
# 3: col3 13 23 33
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Answer by A5C1D2H2I1M1N2O1R2T1 for best way to transpose data.table
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