Solution, 1st attempt

Rainer · Rainer · commit 515af0b9c7fc · 2015-06-22T01:27:18.000+02:00
diff --git a/cachematrix.R b/cachematrix.R
@@ -1,15 +1,36 @@
 ## Put comments here that give an overall description of what your
 ## functions do
 
-## Write a short comment describing this function
+## makeCacheMatrix creates a special matrix object that can cache its 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
+## cacheSolve computes the inverse of the special matrix object that is returned
+## by makeCacheMatrix. If the inverse has already been computed on this 
+## particular matrix object, the inverse won't be recalculated; instead, it
+## is retrieved from the cache.
 
 cacheSolve <- function(x, ...) {
         ## Return a matrix that is the inverse of 'x'
+        i <- x$getinverse()
+        if(!is.null(i)) {
+                message("getting cached data")
+                return(i)
+        }
+        data <- x$get()
+        i <- solve(data, ...)
+        x$setinverse(i)
+        i
 }
