as.rectangular.RdRectangular data objects include matrices, data frames, and atomic vectors.
as.rectangular(x) returns x if x is already rectangular, or as.data.frame(x) if it is not.
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as.rectangular(list(a=1:10, b=11:20))
#> a b
#> 1 1 11
#> 2 2 12
#> 3 3 13
#> 4 4 14
#> 5 5 15
#> 6 6 16
#> 7 7 17
#> 8 8 18
#> 9 9 19
#> 10 10 20