From 84661fcafa626bcb43973aefa1cd3d7293b53b06 Mon Sep 17 00:00:00 2001
From: Adam Sunderland <iterion@gmail.com>
Date: Sun, 20 Apr 2014 15:10:40 -0500
Subject: [PATCH 1/2] initial matrix inverse caching

---
 cachematrix.R | 32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/cachematrix.R b/cachematrix.R
index a50be65aa44..7771c043708 100644
--- a/cachematrix.R
+++ b/cachematrix.R
@@ -1,9 +1,25 @@
-## Put comments here that give an overall description of what your
-## functions do
+## These two functions allow a user to cache the inverse computation on
+## a matrix. This is beneficial in that the inverse will not need to be
+## recomputed for each iteration of a loop.
 
-## Write a short comment describing this function
+## In this function we create 4 methods that allow the user to get
+## and set a cached matrix, as well get and set the value for the inverse
+## of the matrix.
+## makeCacheMatrix returns a list of these 4 functions so that a user 
+## can appropriately update the cached inverse.
 
 makeCacheMatrix <- function(x = matrix()) {
+  i <- NULL
+  set <- function(y) {
+    x <<- y
+    i <<- NULL
+  }
+  get <- function() x
+  setinverse <- function(inverse) i <<- inverse
+  getinverse <- function() i
+  list(set = set, get = get,
+       setmean = setmean,
+       getmean = getmean)
 
 }
 
@@ -11,5 +27,13 @@ makeCacheMatrix <- function(x = matrix()) {
 ## Write a short comment describing this function
 
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+  i <- x$getinverse()
+  if(!is.null(i)) {
+    message("getting cached inverse")
+    return(i)
+  }
+  data <- x$get()
+  i <- solve(data, ...)
+  x$setinverse(i)
+  i
 }

From 492a0efab4cdd673e0d89f9268aa1b507a0644a7 Mon Sep 17 00:00:00 2001
From: Adam Sunderland <iterion@gmail.com>
Date: Sun, 20 Apr 2014 15:22:19 -0500
Subject: [PATCH 2/2] inverse caching working

Improved documentation
Fixed typos
---
 cachematrix.R | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/cachematrix.R b/cachematrix.R
index 7771c043708..c6d091a3573 100644
--- a/cachematrix.R
+++ b/cachematrix.R
@@ -17,21 +17,26 @@ makeCacheMatrix <- function(x = matrix()) {
   get <- function() x
   setinverse <- function(inverse) i <<- inverse
   getinverse <- function() i
-  list(set = set, get = get,
-       setmean = setmean,
-       getmean = getmean)
 
+  list(set = set, get = get,
+       setinverse = setinverse,
+       getinverse = getinverse)
 }
 
 
-## Write a short comment describing this function
+## cacheSolve first checks if the inverse has been calculated and cached.
+## If it was available it returns it immediately. If not, it calculates the
+## inverse, caches it for future requests, and then returns the inverse.
 
 cacheSolve <- function(x, ...) {
+  #try to get inverse and return immediately if available
   i <- x$getinverse()
   if(!is.null(i)) {
     message("getting cached inverse")
     return(i)
   }
+
+  #no cache was present, so calculate the inverse and cache it
   data <- x$get()
   i <- solve(data, ...)
   x$setinverse(i)