[R] Unlist command drops all my column names in the first row and adopts NAs
nal at princeton.edu
Wed Apr 20 17:05:26 CEST 2011
I am having trouble turning my data.frame into a matrix format. Because I
wanted to change my data.frame with mostly factor variables into a numeric
matrix, I used the following code -->
However when i checked the mode of the UN2010frame, it still showed up as a
list. Because the code I want to run (Ordrating) does not accept data in a
list format, I used UN2010matrix <- unlist(UN2010frame) to unlist my matrix.
When I did this, my first row ( which was formerly a row with column names)
turned into NAs. This was a problem for me because when I tried to run an
ordinal IRT model using this data set, I got the following error message.
Error in 1:nrow(Y) : argument of length 0
I think it is because all the values in my first row are now gone....
If you could help me on any front, It would be deeply appreciated. Thank you
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