Week 3 assignment (author update)

Author: skimport

cachematrix.R

@@ -1,15 +1,33 @@
-## Put comments here that give an overall description of what your
-## functions do
-
-## Write a short comment describing this function
+## The idea is to create a cache of the inverse of a matrix so as to not have
+## to compute it over and over when the matrix has not changed.
 
+## Function that creates a "matrix" that contains its own inverse
 makeCacheMatrix <- function(x = matrix()) {
-
+    inv <- NULL
+    set <- function(y) { # set the value of the matrix
+        x <<- y
+        inv <<- NULL
+    }
+    get <- function() x # get the value of the matrix
+    setinverse <- function(inverse) inv <<- inverse # set the inverse
+    getinverse <- function() inv # get the inv
+    list(set = set, get = get,
+         setinverse = setinverse,
+         getinverse = getinverse)
 }
 
 
-## Write a short comment describing this function
-
+## Inverts the given matrix, returning the cached inverse if it exists
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+    inv <- x$getinverse()
+    if(!is.null(inv)) {
+        message("getting cached data")
+        return(inv)
+    }
+    data <- x$get()
+    inv <- solve(data, ...)
+    x$setinverse(inv)
+    inv
 }
+
+