R PROGRAMING lapply FUNCTION TUTORIAL
Learn all about R programming lapply function through this amazing tutorial!
lapply
lapply returns a list of the same length as X, each element of which is the result of applying FUN to the corresponding element of X.
Usage:
lapply(X, FUN, …)
Arguments:
X
a vector (atomic or list) or an expression object. Other objects (including classed objects) will be coerced by base::as.list.
FUN
the function to be applied to each element of X: see ‘Details’. In the case of functions like +, %*%, the function name must be backquoted or quoted.
…
optional arguments to FUN.
You want to apply a given function to every element of a list and obtain a list as a result. When you execute ?lapply, you see that the syntax looks like the apply() function.
The difference is that:
It can be used for other objects like dataframes, lists or vectors; and
The output returned is a list (which explains the “l” in the function name), which has the same number of elements as the object passed to it.
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