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When I unlist a list of dates it turns them back into numerics. Is that normal? Any workaround other than re-applying as.Date?
> dd <- as.Date(c("2013-01-01", "2013-02-01", "2013-03-01")) > class(dd) [1] "Date" > unlist(dd) [1] "2013-01-01" "2013-02-01" "2013-03-01" > list(dd) [[1]] [1] "2013-01-01" "2013-02-01" "2013-03-01" > unlist(list(dd)) [1] 15706 15737 15765 Is this a bug?
789
unlist() function in R Language is used to convert a list to vector. It simplifies to produce a vector by preserving all components.
To convert R List to Matrix, use the matrix() function and pass the unlist(list) as an argument. The unlist() method in R simplifies it to produce a vector that contains all the atomic components which occur in list data.
do.call is a handy function to "do something" with a list. In our case, concatenate it using c. It's not uncommon to cbind or rbind data.frames from a list into a single big data.frame.
What we're doing here is actually concatenating elements of the dd list. This would be analogous to c(dd[[1]], dd[[2]]). Note that c can be supplied as a function or as a character.
> dd <- list(dd, dd) > (d <- do.call("c", dd)) [1] "2013-01-01" "2013-02-01" "2013-03-01" "2013-01-01" "2013-02-01" "2013-03-01" > class(d) # proof that class is still Date [1] "Date" If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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