hadley wickham wrote:
You might try using the reshape package instead:
last <- function(x) x[length(x)]
names(d) <- c("value", "person", "time")
cast(d, person ~ time, last)
The first and the last line I think is clear, although I will have to
experiment more to understand the call on cast () better. However, what I
do not understand is the purpose of the second line. I can print out
names(d) right after the reading the frame with the read.table function. If
I print names (d) right after that statement has been executed, then I see
no difference. Even so, it seems to be necessary for the call on cast to
work. It seems that "names" is not the same as "names". Something along
the lines of a with () or attach () perhaps?
It's a small change - but cast requires the value column to be called
"value" (no s!)
Aha! Thank you!
Tom
Hadley
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