cachematrix.R

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

## Write a short comment describing this function

makeCacheMatrix <- function(x = matrix()) {
  ## 1. set the matrix
  ## 2. get the matrix
  ## 3. set the inverse
  ## 4. get the inverse
  
   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)
}


## Write a short comment describing this function

cacheSolve <- function(x, ...) {
        ## Return a matrix that is the inverse of 'x'
        ##  output of makeCacheMatrix()
  inv <- x$getInverse()
 ## if the inverse has already been calculated
  if (!is.null(inv)) {
    # get it from the cache 
    print("getting cached data")
    return(inv)
  }
  # calculates the inverse 
  mat <- x$get()
  inv <- solve(mat, ...)
  # sets the value of the inverse in the cache
  x$setInverse(inv)
  inv
}

#Testing
matrix_1=matrix(1:4,2,2)
m=makeCacheMatrix(matrix_1)
m$get()
cacheSolve(m)