From 2f88133bdf2f59ba0c66af01ec5157c019a1ebaf Mon Sep 17 00:00:00 2001
From: Ivan Selchenkov <vashik.net@gmail.com>
Date: Sat, 26 Apr 2014 18:36:41 +0400
Subject: [PATCH 1/2] Caching the Inverse of a Matrix

---
 cachematrix.R | 38 ++++++++++++++++++++++++++++++--------
 1 file changed, 30 insertions(+), 8 deletions(-)

diff --git a/cachematrix.R b/cachematrix.R
index a50be65aa44..2c63e717533 100644
--- a/cachematrix.R
+++ b/cachematrix.R
@@ -1,15 +1,37 @@
-## Put comments here that give an overall description of what your
-## functions do
-
-## Write a short comment describing this function
+## This is a couple of functions which is used to cache
+## inverse of a matrix
 
+## Creates a special object to store inverse of a matrix
 makeCacheMatrix <- function(x = matrix()) {
-
+  inv <- NULL
+  
+  ## get & set original matrix (unused in this task)
+  set <- function(m) {
+    x <<- m
+    inv <<- NULL
+  }
+  get <- function() x
+  
+  ## get & set the inverse of a matrix
+  setinv <- function(inverse) inv <<- inverse
+  getinv <- function() inv
+  
+  list(set = set, get = get, setinv = setinv, getinv = getinv)  
 }
 
 
-## Write a short comment describing this function
-
+## Returns the inverse of matrix 'x'. 
+## If the inverse is not present in cache, will calculate it and store to cache.
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+  inv <- x$getinv()
+  
+  if(!is.null(inv)) {
+    message("getting cached data")
+    return (inv)
+  }
+  data <- x$get()
+  inv = solve(data, ...)
+  x$setinv(inv)
+  
+  inv
 }

From 4ed39d46a3b0e5ddfc4d64a8a1729b99b8d70794 Mon Sep 17 00:00:00 2001
From: Ivan Selchenkov <vashik.net@gmail.com>
Date: Sun, 27 Apr 2014 20:28:58 +0400
Subject: [PATCH 2/2] comment changed

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

diff --git a/cachematrix.R b/cachematrix.R
index 2c63e717533..a29fbfc0059 100644
--- a/cachematrix.R
+++ b/cachematrix.R
@@ -5,7 +5,7 @@
 makeCacheMatrix <- function(x = matrix()) {
   inv <- NULL
   
-  ## get & set original matrix (unused in this task)
+  ## get & set original matrix
   set <- function(m) {
     x <<- m
     inv <<- NULL