From b22d55dcf3fb17cf03344806ceb61836c098151f Mon Sep 17 00:00:00 2001
From: Patrick Ashamalla <patrick.ashamalla@gmail.com>
Date: Thu, 23 Apr 2015 21:37:41 -0400
Subject: [PATCH 1/2] added makeCacheMatrix and cacheSolve

---
 .gitignore    |  4 ++++
 cachematrix.R | 32 ++++++++++++++++++++++++++------
 2 files changed, 30 insertions(+), 6 deletions(-)
 create mode 100644 .gitignore

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000000..1c079f289fa
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+.Rproj.user
+.Rhistory
+.RData
+ProgrammingAssignment2.Rproj
diff --git a/cachematrix.R b/cachematrix.R
index a50be65aa44..337df5ed15d 100644
--- a/cachematrix.R
+++ b/cachematrix.R
@@ -1,15 +1,35 @@
-## Put comments here that give an overall description of what your
-## functions do
+## The following functions allow you to create a matrix and cache the inverse of a 
+## matrix for later reference if it is available
 
-## Write a short comment describing this function
+## makeCacheMatrix: This function creates a special "matrix" object that can cache its 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
+## cacheSolve: 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 the cachesolve should retrieve the inverse from the cache.
 
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+    ## Return a matrix that is the inverse of 'x'
+    inv <- x$getinverse()
+    if (!is.null(inv)) {
+        message("getting cached data")
+        return(inv)
+    }
+    message('still null')
+    data <- x$get()
+    inv <- solve(data)
+    x$setinverse(inv)
+    inv
 }

From d0deacd3f3a3b99e4cd06b346af50ca0d48ecfc3 Mon Sep 17 00:00:00 2001
From: Patrick Ashamalla <patrick.ashamalla@gmail.com>
Date: Thu, 23 Apr 2015 21:38:31 -0400
Subject: [PATCH 2/2] Removed ## still null

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

diff --git a/cachematrix.R b/cachematrix.R
index 337df5ed15d..4f19d66fffd 100644
--- a/cachematrix.R
+++ b/cachematrix.R
@@ -27,7 +27,6 @@ cacheSolve <- function(x, ...) {
         message("getting cached data")
         return(inv)
     }
-    message('still null')
     data <- x$get()
     inv <- solve(data)
     x$setinverse(inv)