From 4adbdfcd091f5d09327f2d48df35c9872f2bd864 Mon Sep 17 00:00:00 2001
From: Roberto Arce <robertoarcee@gmail.com>
Date: Wed, 23 Apr 2014 09:25:12 -0300
Subject: [PATCH 1/2] Functions to cache a inverse matrix calculation

---
 cachematrix.R | 37 +++++++++++++++++++++++++++++--------
 1 file changed, 29 insertions(+), 8 deletions(-)

diff --git a/cachematrix.R b/cachematrix.R
index a50be65aa44..cf810396ff5 100644
--- 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
+## Pair of functions to cache a matrix inverse calculation
+# example of use:
+# m = matrix(rnorm(100),nrow=10)
+# m = makeCacheMatrix(m)
+# mi = cacheSolve(m)
 
+## 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(inverse) m <<- inverse
+  getinverse <- function() m
+  list(set = set, get = get,
+       setinverse = setinverse,
+       getinverse = getinverse)
 }
 
 
-## Write a short comment describing this function
-
+## Computes the inverse of the special "matrix" returned by makeCacheMatrix
+## f 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
 }

From 83a1af6c95b741b9528b92a3d961af7201adbe40 Mon Sep 17 00:00:00 2001
From: Roberto Arce <robertoarcee@gmail.com>
Date: Wed, 23 Apr 2014 08:26:59 -0400
Subject: [PATCH 2/2] Update cachematrix.R

---
 cachematrix.R | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cachematrix.R b/cachematrix.R
index cf810396ff5..ab78bd20baf 100644
--- a/cachematrix.R
+++ b/cachematrix.R
@@ -22,7 +22,7 @@ makeCacheMatrix <- function(x = matrix()) {
 
 ## Computes the inverse of the special "matrix" returned by makeCacheMatrix
 ## f the inverse has already been calculated (and the matrix has not changed), 
-## then cacheSolve should retrieve the inverse from the cache.
+## retrieve the inverse from the cache.
 cacheSolve <- function(x, ...) {
   m <- x$getinverse()
   if(!is.null(m)) {