ryanbower
diff --git a/‎.Rhistory b/‎.Rhistory
diff --git a/‎cachematrix.R
Lines changed: 35 additions & 6 deletions b/‎cachematrix.R
Lines changed: 35 additions & 6 deletions
@@ -1,15 +1,44 @@
-## Put comments here that give an overall description of what your
-## functions do
+### Assignment: Caching the Inverse of a Matrix
 
-## Write a short comment describing this function
+## Description: Matrix inversion is usually a costly computation 
+##   and there may be some benefit to caching the inverse of a 
+##   matrix rather than computing it repeatedly. This pair of 
+##   functions cache the inverse of a matrix.
 
-makeCacheMatrix <- function(x = matrix()) {
 
+## This function creates a special "matrix" object
+##   that can cache its inverse.
+
+makeCacheMatrix <- function(x = matrix()) {
+  m <- NULL
+  set <- function(y) {
+    x <<- y
+    m <<- NULL
+  }
+  get <- function() x
+  setinverse <- function(solve) m <<- solve
+  getinverse <- function() m
+  list(set = set, get = get,
+       setinverse = setinverse,
+       getinverse = getinverse)
+  
 }
 
 
-## Write a short comment describing this function
+## 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
+##   `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'
+  m <- x$getinverse()
+  if(!is.null(m)) {
+    message("getting cached data")
+    return(m)
+  }
+  data <- x$get()
+  m <- solve(data, ...)
+  x$setinverse(m)
+  m
 }