Displaying 3 results from an estimated 3 matches for "jpl2116".
2012 Jul 10
1
cbind and cbind.data.frame
## Hi, I'm having trouble understanding how the cbind function decides what
method to apply to its arguments. Easy cut and paste code below.
>
>
>
> ## create two columns
> c1 <- c("A","A","B","B")
> c2 <- 1:4
>
> ## cbind outputs a matrix with elements that are characters, seems
reasonable
> out <-
2012 Jun 15
2
POSIXlt and trunc
Hi,
I'm having trouble understanding how trunc is operating on vectors of
POSIXlt objects. Why does dates[1:4] in the last line return a bunch of NAs
even though dates look like it has all the right elements? This worries me
that something is off with my use of trunc. Is trunc not suppose to be
vectorized with POSIXlt? If not, then how should I truncate a bunch of
POSIXlt objects? I'm
2011 Sep 13
1
class weights with Random Forest
Hi All,
I am looking for a reference that explains how the randomForest function in
the randomForest package uses the classwt parameter. Here:
http://tolstoy.newcastle.edu.au/R/e4/help/08/05/12088.html
Andy Liaw suggests not using classwt. And according to:
http://r.789695.n4.nabble.com/R-help-with-RandomForest-classwt-option-td817149.html
it has "not been implemented" as of 2007.