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ringer
2004 Jan 09
3
ipred and lda
Dear all,
can anybody help me with the program below? The function predict.lda
seems to be defined but cannot be used by errortest.
The R version is 1.7.1
Thanks in advance,
Stefan
----------------
library("MASS");
library("ipred");
data(iris3);
tr <- sample(1:50, 25);
train <- rbind(iris3[tr,,1], iris3[tr,,2], iris3[tr,,3]);
test <- rbind(iris3[-tr,,1],
2004 Jul 26
3
computing sum of indicator variables
My problem is as follows:
i is a list of integers of variable length. Now I want to compute a new
vector/array that contains 1's at the positions indicated in i. For
example:
c(2, 4) -> c(0, 1, 0, 1)
Using something like
i = i - c(0, i[2:length(i) - 1]);
sapply(i, function(x) c(rep(0, x - 1), 1)));
faces me with the problem of concatenating the result, which I could
somehow not find a