submission for grading

Author: jsaedtler

cachematrix.R

@@ -1,15 +1,42 @@
-## Put comments here that give an overall description of what your
-## functions do
+## These methods can be used to cache the inverse calculation.
+## to create a cachable matrix, do this:
+## cachedMatrix <- makeCacheMatrix(matrix(1:4,2,2))
+## to calculate the inverse do this:
+## cacheSolve(cachedMatrix)
 
-## Write a short comment describing this function
 
+## This function generates an Object that holds a matrix and it's
+## possibily cached inverse. In order to calculate the inverse using caching
+## use the cacheSolve method.
 makeCacheMatrix <- function(x = matrix()) {
+  inverse <- NULL
+  set <- function(y) {
+    x <<- y
+    inverse <<- NULL
+  }
+  get <- function() x
+  setinverse <- function(inv) inverse <<- inv
+  getinverse <- function() inverse
+  list(set = set, get = get,
+       setinverse = setinverse,
+       getinverse = getinverse)
 
 }
 
 
-## Write a short comment describing this function
+## This function calculates the inverse of a CacheMatrix 
+## which was constructed my using the makeCacheMatrix function.
+## The First call calculates the inverse, every succeeding call
+## uses the cached inverse.
 
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+  i <- x$getinverse()
+  if(!is.null(i)) {
+    message("getting cached data")
+    return(i)
+  }
+  data <- x$get()
+  i <- solve(data, ...)
+  x$setinverse(i)
+  i
 }