cachematrix.R

## Calculate inverse of a matrix, or retrieve this
## value from cache if already calculated

## This function generates object of type makeCacheMatrix()
## for subsequent use by the cacheSolve function

makeCacheMatrix <- function(x = matrix()) {
        i <- NULL
        set <- function(y) {
                x <<- y
                i <<- NULL
        }
        get <- function() x
        setinverse <- function(inverse) i <<- inverse
        getinverse <- function() i
        list(set = set, get = get,
             setinverse = setinverse,
             getinverse = getinverse)
}


## This function either determines the inverse of a
## provided matrix, or retrieves this value from the cache if
## already computed

cacheSolve <- function(x, ...) {
        i <- x$getinverse()
        if(!is.null(i)) {
                message("getting cached inverse")
                return(i)
        }
        data <- x$get()
        i <- solve(data, ...)
        x$setinverse(i)
        i
}