R help - Aug 2006 - missing value

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

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
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

dat[dat==9] <- NA
because the result of mean() is real and summary()'s output is a vector.
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Mauricio Cardeal a ?crit :
> 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
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>