finihed assignment

Author: dguedo

cachematrix.R

@@ -1,15 +1,34 @@
-## Put comments here that give an overall description of what your
-## functions do
+## Here are a pair of functions that cache the inverse of a matrix
 
-## Write a short comment describing this function
 
-makeCacheMatrix <- function(x = matrix()) {
+## This function creates a special "matrix" object that can cache its inverse
 
+makeCacheMatrix <- function(x = matrix()) {
+  m <- NULL
+  set <- function(y) {
+    x <<- y
+    m <<- NULL
+  }
+  get <- function() x
+  setinverse <- function(ivrs) m <<- ivrs
+  getinverse <- function() m
+  
+  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, ...) {
-        ## Return a matrix that is the inverse of 'x'
-}
+  m <- x$getinverse()
+  if(!is.null(m)) {
+    message("getting cached data")
+    return(m)
+  }
+  data <- x$get()
+  m <- solve(data)
+  x$setinverse(m)
+  m
+}