cachematrix.R

## Put comments here that give an overall description of what your
## functions do

## This function creates a special "matrix" object that can cache its inverse.
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)

}


## This function computes the inverse of the special "matrix" returned by makeCacheMatrix above. 
## If the inverse has already been calculated (and the matrix has not changed), 
## then the cachesolve should retrieve the inverse from the cache.

cacheSolve <- function(x, ...) {
        inv <- x$getinverse()
        if(!is.null(inv)){
                message("getting cached data")
                return(inv)
        }
        mat <- x$get()
        inv <- solve(mat, ...)
        x$setinverse(inv)
        inv
        ## Return a matrix that is the inverse of 'x'
}