Reproducible example:
x <- list(list(list(), list()))
unlist(x)
*> Error in as.character.factor(x) : malformed factor*
What should happen:
unlist(x)
> NULL
R.version
platform x86_64-apple-darwin15.6.0
arch x86_64
os darwin15.6.0
system x86_64, darwin15.6.0
status
major 3
minor 5.0
year 2018
month 04
day 23
svn rev 74626
language R
version.string R version 3.5.0 (2018-04-23)
nickname Joy in Playing
--
Steven Nydick
PhD, Quantitative Psychology
M.A., Psychology
M.S., Statistics
--
"Beware of the man who works hard to learn something, learns it, and finds
himself no wiser than before, Bokonon tells us. He is full of murderous
resentment of people who are ignorant without having come by their
ignorance the hard way."
-Kurt Vonnegut
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