cachematrix.R

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

## Write a short comment describing this function:
# The following functions are used to create a special object that stores a matrix
# and caches its inverse. The first function, makeCacheMatrix creates a special 
# "matrix", which is really a list containing a function to:
#   
# 1.set the value of the matrix
# 
# 2.get the value of the matrix
# 
# 3.set the value of the inverse
# 
# 4.get the value of the inverse

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)
}

## Write a short comment describing this function:
# 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 cacheSolve should retrieve 
# the inverse from the cache.

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

#Example:
MyMAT <- matrix(c(1,2,3,4),2,2)
MyMAT_Inv <- makeCacheMatrix(MyMAT)
cacheSolve(MyMAT_Inv) 

cacheSolve(MyMAT_Inv)