Displaying 1 result from an estimated 1 matches for "icfpcontest".
2008 Mar 15
0
Appending new values to an existing factor vector
...memory issues will
still be present if I do that.
What I'd like is a way to read in, say, a million lines at a time, do the factor
conversion, then append to my existing data frame, which has columns of factors.
However, something I came across while participating in the ICFP 2007
(http://www.icfpcontest.org/) using R was the strange behaviour when adding
new/unknown values to a factor vector:
> (a <- factor(c("I","C","I","C","F","I")))
[1] I C I C F I
Levels: C F I
> append(a,"P")
[1] "3" "1" "...