Example for sapply in R

sapply_eg.R

## Supposed you want to apply an operation to every element in a vector. Efficient way to do it in R is to use sapply / lapply

## Sample vector of 100 observation
x_vec <- rnorm(100)

## Need to find the absolute value of each element

x_abs <- sapply(x_vec,abs)

## The above implementation equivalent to doing x_abs <- abs(x_vec)

## But in case of userdefined functions, this is helpful

x_new <- sapply(x_vec,function(x) x > 2.0)