From 5388602095d69e5f04e6d4f5e4d24aa42cfe1b19 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jean-Fran=C3=A7ois=20Michel?= <jfmichel@gmail.com>
Date: Sat, 19 Jul 2014 15:23:05 +0200
Subject: [PATCH 1/2] Update cachematrix.R

programming assignment 2
---
 cachematrix.R | 35 ++++++++++++++++++++++++++++-------
 1 file changed, 28 insertions(+), 7 deletions(-)

diff --git a/cachematrix.R b/cachematrix.R
index a50be65aa44..dd8626059f5 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
+##  Creates a special "matrix" object that can cache its inverse.
+##  x : the matrix to encapsulate
+##  set(y) : set the matrix
+##  get : get the matrix
+##  setinverse(inverse) : set the inverse of the current matrix
+##  getinverse : retrieve the cached inverse matrix or NULL if no inverse matrix was set
 
 makeCacheMatrix <- function(x = matrix()) {
-
+   inv <- NULL
+   set <- function(y) {
+       x <<- y
+       inv <<- NULL
+   }
+   get <- function() x
+   setinverse <- function(inverse) inv <<- inverse
+   getinverse <- function() inv
+   list(set = set, get = get,
+        setinverse = setinverse,
+        getinverse = getinverse)   
 }
 
 
-## Write a short comment describing this function
+## Compute the inverse matrix of the CacheMatrix x.
+## This function returns the cached inverse matrix of x if it exists. 
+## If not it computes the inverse matrix of the encapsulated matrix of x and caches the result
 
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+    ## Return a matrix that is the inverse of 'x'
+    inv <- x$getinverse()
+    if (!is.null(inv)) {
+        return(inv)
+    }
+    inv <- solve(x$get())
+    x$setinverse(inv)
+    inv
 }

From bcd1055b38a426ab9fef8d8e89f97c95a20542bf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jean-Fran=C3=A7ois=20Michel?= <jfmichel@gmail.com>
Date: Fri, 25 Jul 2014 02:25:56 +0200
Subject: [PATCH 2/2] Update cachematrix.R

pass arguments to solve
---
 cachematrix.R | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cachematrix.R b/cachematrix.R
index dd8626059f5..76bd25bc938 100644
--- a/cachematrix.R
+++ b/cachematrix.R
@@ -30,7 +30,7 @@ cacheSolve <- function(x, ...) {
     if (!is.null(inv)) {
         return(inv)
     }
-    inv <- solve(x$get())
+    inv <- solve(x$get(), ...)
     x$setinverse(inv)
     inv
 }