Efficient List Transpose
t_list turns a list of lists inside-out. The performance is quite efficient regardless of the size of the list.
t_list(l)
l |
a list of lists. Elements inside the sublists can be heterogenous, including further lists. |
l transposed such that the second layer of the list becomes the top layer and the top layer the second layer. See Examples.
# Homogenous list of lists l <- list(a = list(c = 1, d = 2), b = list(c = 3, d = 4)) str(l) str(t_list(l)) # Heterogenous case l2 <- list(a = list(c = 1, d = letters), b = list(c = 3:10, d = list(4, e = 5))) attr(l2, "bla") <- "abc" # Attributes other than names are preserved str(l2) str(t_list(l2)) rm(l, l2)
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