cachematrix.R

## These functions can be useful to cache matrix inversion.
# are used to create a matrix 
## 

## makeCacheMatrix constructs a list of functions
## to set and get the inverse of a matrix
makeCacheMatrix <- function(x = matrix()) {
  inv <- NULL
  set <- function(y) {
    x <<- y
    inv <<- NULL
  }
  get <- function() x
  setinverse <- function(inverse) inv <<- inverse
  getinverse <- function() inv
  list(set = set, get = get,
       setinverse = setinverse,
       getinverse = getinverse)
  
}

## cacheSolve returns the inverse of the matrix. It 
## initially checks if a cached result exists and 
## computes the inverse if not.
cacheSolve <- function(x, ...) {
  inv <- x$getinverse()
  if(!is.null(inv)) {
    message("getting cached data")
    return(inv)
  }
  data <- x$get()
  inv <- solve(data, ...)
  x$setinverse(inv)
  inv
}