[R] matrix with Loop

[R. Michael Weylandt]

apply(x, 1, mean)
apply(x, 2, median)

or for more speed rowMeans()

? apply

Michael

On Thu, Mar 29, 2012 at 9:00 AM, Christopher Kelvin
<chris_kelvin2001 at yahoo.com> wrote:
> Hello!
> I got something to ask..whether you can help me with the R program...i got this for example 5x4 matrix..and i want to find:
>  i) mean for each row of the matrix
> ii) median for each column of the matrix
> and i need to do this using a loop function...below is my program..u try to check it for me as the output that i got is not what i desired...thanks..
>
> data<-rnorm(20,0,1)
> dim(data)<-c(5,4)
> is.matrix(data)
> data
> a<-function(x)
> {
> for(i in 1:nrow(x))
> {
> for(j in 1:ncol(x))
> {
> med<-median(x[,j])
> mean<-mean(x[i,])
> print(c(med=med,mean=mean))
> }
> }
> }
> a(data)
>
> Chris Guure
> Researcher
> Institute for Mathematical Research
> UPM
>
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