Operating on each row of data frame
Look at the apply function ?apply x = data.frame(x1=c(1,2,3,4,5),x2=c(2,4,6,8,10),x3=c(1,3,5,7,9)) x$x5=apply(x,1,mean) x$x6=apply(x,1,sd) print(x)
Abhishek Pratap wrote:
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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