[R] Operating on each row of data frame

[Stephan Kolassa]

Hi,

does this do what you want?

d <- cbind(d,apply(d[,c(2,3,4)],1,mean),apply(d[,c(2,3,4)],1,sd))

HTH,
Stephan


Abhishek Pratap schrieb:
> Hi All
> 
> I have a data frame in which there are 4 columns .
> 
> Column 1 : name
> 
> Column 2-4 : values
> 
> I would like to calculate mean/Standard error  of values in column 2-4 and
> store them in column 5,6 respectively.
> 
> 
> 
> I have done the following but doesn't seem to work
> 
> mean_N_SE <-function(x)
> {
> 
> name <- x[1]
> vals <- c(x[2:4])
> temp_mean <- mean(vals)
> SE <-  sqrt(var(x)/length(x))
> 
> }
> 
> apply(d,1,mean_N_SE) where d = data frame.
> 
> 
> Can someone help me with this.
> 
> Thanks!
> -Abhi
> 
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> 
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