[R] missing value

[Uwe Ligges]

Mauricio Cardeal wrote:
> Hi all
> 
> # I have this data set and how can I assign NA´s in just one command ? 

is.na(dat[dat==9]) <- TRUE

> And why the summary(dat) function preserves the value 9 as real. ?
>

Because you have not changed the contents of dat at all, only the 
contents of x,y,z, and w.

Uwe Ligges


> 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
> 
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