cachematrix.R

##  This function takes a matrix stores it (under variable "x") and returnes a list of functions. 
##  These functions are called by the "cacheSolve" function to handle the matrix inversion and to set the status of the matrix inversion 
##  (see "cacheSolve function" for explenation about the status mechanism).

## Stores matrix and returnes list of functions
makeCacheMatrix <- function(x = matrix()) {
    m <- NULL
    set <- function(y) {
        x <<- y
        m <<- NULL
    }
    
    get <- function() x
    setinverse <- function(solve) m <<- solve
    getinverse <- function() m
    list(set = set, get = get,
         setinverse = setinverse,
         getinverse = getinverse)
    
}


##  This function calls the different "makeCacheMatrix" functions according to the status of m. 
##  When a new matrix is used m=null. Therefore the inverse matrix will be calculated and m will be set to the resut of this calculation (inverse matrix) and returned. 
##  When the same matrix is called again m=invers matrix and therefore not null. ##  Therefore the function will simply return m (inverse matrix) together with a messege that this is a cached data.

## Returnes the inverse matrix of x

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