Hello, after the creation of a data.frame I like to add NAs as follows:
n <- 743;
x <- runif(n, 1, 7);
Y <- runif(n, 1, 7);
Ag6 <- runif(n, 1, 7);
df <- data.frame(x, Y, Ag6);
# a list with positions:
v <- apply(df, 2, function(x) sample(n, sample(1:ceiling(5*n/100), 1), repl=F));
# a loop too much?
for (i in 1:length(df)){
df[unlist(v[i]), i] <- NA;
}
summary(df);
This works fine but it appears to me that there is a more elegant and simple
way -- which one?
Thanks
Sören
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