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This is a simple version of purrr::transpose, only for lists with 2 levels.
purrr::transpose
invertList(l)
A list with 2 levels deep, inverted from l
l
A list with 2 levels. If some levels are absent, they will be NULL
NULL
# create a 2-deep, 2 levels in first, 3 levels in second a <- list(a = list(d = 1, e = 2:3, f = 4:6), b = list(d = 5, e = 55)) invertList(a) # creates 2-deep, now 3 levels outer --> 2 levels inner
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