[R] bootstrap help

[luciferyan]

I have a similar question.
I want to generate list of 50 bootstrap samples,
it can be done by:

lapply(1:50,function(i){data[sample(nrow(data),size=nrow(data),replace=TRUE),]})

>From these  bootstrap samples, I want to work out the Bootstrap estimates,
which is E[y]/E[x].
How can I do it?

'>> data<-data.frame(x=rnorm(49), y=rnorm(49))
>> t(sapply(1:50,function(i){colMeans(data[sample(nrow(data),size=nrow(data),replace=TRUE),])}))'
These codes will generate mean of column x and mean of column y. 
Is y the corresponding of x? because x and y are pair data.

Thank you.
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