From 933a6d3899411bb1f95da6ac091afdbe41545a50 Mon Sep 17 00:00:00 2001
From: Beres Botond <bberes@demonware.net>
Date: Sun, 27 Jul 2014 15:32:10 +0200
Subject: [PATCH 1/2] First version of the functions

---
 cachematrix.R | 36 ++++++++++++++++++++++++++++++------
 1 file changed, 30 insertions(+), 6 deletions(-)

diff --git a/cachematrix.R b/cachematrix.R
index a50be65aa44..40426ab0869 100644
--- a/cachematrix.R
+++ b/cachematrix.R
@@ -1,15 +1,39 @@
 ## Put comments here that give an overall description of what your
 ## functions do
 
-## Write a short comment describing this function
-
+# This function creates a special matrix which is really
+# a list containing a function to
+# 1. set the value of the matrix
+# 2. get the value of the matrix
+# 3. set the value of the inverse
+# 4. get the value of the inverse
 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
-
+# The following function calculates the inverse of the special "matrix"
+# created with makeCacheMatrix. 
+# However, it first checks for an already cached inverse and skips
+# the computation if it finds one.
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+  ## Return a matrix that is the inverse of 'x'
+  inv <= x$getinverse()
+  if(!is.null(inv)) {
+    message("getting cached data!")
+    return(inv)
+  }
+  data <- x$get()
+  inv <- solve(data, ...)
+  x$setinverse(inv)
+  inv
 }

From ac187f1d838647091834ac760566387fb19380a7 Mon Sep 17 00:00:00 2001
From: Beres Botond <bberes@demonware.net>
Date: Sun, 27 Jul 2014 15:38:24 +0200
Subject: [PATCH 2/2] Fixed a bug and finished comments

---
 cachematrix.R | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/cachematrix.R b/cachematrix.R
index 40426ab0869..94dca87c287 100644
--- a/cachematrix.R
+++ b/cachematrix.R
@@ -1,5 +1,4 @@
-## Put comments here that give an overall description of what your
-## functions do
+# The functions below provide a way to cache matrix inversions
 
 # This function creates a special matrix which is really
 # a list containing a function to
@@ -27,7 +26,7 @@ makeCacheMatrix <- function(x = matrix()) {
 # the computation if it finds one.
 cacheSolve <- function(x, ...) {
   ## Return a matrix that is the inverse of 'x'
-  inv <= x$getinverse()
+  inv <- x$getinverse()
   if(!is.null(inv)) {
     message("getting cached data!")
     return(inv)