Homework Assignment 2

Author: netsemantics

cachematrix.R

@@ -1,15 +1,36 @@
-## Put comments here that give an overall description of what your
-## functions do
-
-## Write a short comment describing this function
+## This pair of functions allow the use of lexical scoping to hold state i.e cache
+## results
 
+## creates a special "matrix", which is really a list containing 4 function to
+## set and get the function values and set and get the inverse of the input matrix
 makeCacheMatrix <- function(x = matrix()) {
-
+  i <- NULL
+  set <- function(y) {
+    x <<- y
+    i <<- NULL
+  }
+  get <- function() x
+  setinv <- function(inv) i <<- inv
+  getinv <- function() i
+  list(set = set, get = get,
+       setinv = setinv,
+       getinv = getinv)
+  
 }
 
 
-## Write a short comment describing this function
-
+## This function takes the output of the 'makeCacheMatrix' function as input
+## and either gets a cached value or "solves" the inverse and stores that in the cache
 cacheSolve <- function(x, ...) {
         ## Return a matrix that is the inverse of 'x'
+  i <- x$getinv()
+  if(!is.null(i)) {
+    message("getting cached data")
+    return(i)
+  }
+  data <- x$get()
+  i <- solve(data) ##%*% data
+  x$setinv(i)
+  i
+
 }