R help - Mar 2004 - (kein Betreff)

On Wed, 2004-03-31 at 19:01, Mag. Ferri Leberl wrote:
> Dear colleagues!
> 
> How can I calculate the mean of every line of "feld" without
using the command
> "for"?
> 
> Thank You in advance
> 
> 
> feld<-array(,c(100,10))
> mittel<-array(,c(100,1))
> feld[,]<-rnorm(1000)
> for(a in 1:100){mittel[a]<-mean(feld[a,])}
You could use:

mittel <- apply(feld, 1, mean)

prodrigues
> 
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Dear colleagues!

How can I calculate the mean of every line of "feld" without using the
command
"for"?

Thank You in advance


feld<-array(,c(100,10))
mittel<-array(,c(100,1))
feld[,]<-rnorm(1000)
for(a in 1:100){mittel[a]<-mean(feld[a,])}

Mag. Ferri Leberl wrote:
> Dear colleagues!
> 
> How can I calculate the mean of every line of "feld" without
using the command
> "for"?
> 
> Thank You in advance
> 
> 
> feld<-array(,c(100,10))
> mittel<-array(,c(100,1))
> feld[,]<-rnorm(1000)
> for(a in 1:100){mittel[a]<-mean(feld[a,])}
> 
(please use an informative subject)

See ?rowMeans

mittel <- rowMeans(feld)

-sd