[R] missing value

[Mauricio Cardeal]

Hi all

# I have this data set and how can I assign NA´s in just one command ? 
And why the summary(dat) function preserves the value 9 as real. ?

x <- c(1,2,3,9,4)
y <- c(3,6,9,2,3)
z <- c(9,9,2,2,8)
w <- c(6,5,3,0,9)

dat <- cbind(x,y,z,w)
summary(dat)

x[x==9] <- NA
y[y==9] <- NA
z[z==9] <- NA
w[w==9] <- NA

summary(dat)
summary(x)
summary(y)
summary(z)
summary(w)

Thank you all,
Mauricio