Updated cachematrix.R for Programming Assignment 2

cachematrix.R

@@ -1,15 +1,44 @@
-## Put comments here that give an overall description of what your
-## functions do
+## makeCacheMatrix: 
+## This function creates a special "matrix" object 
+## that can cache its inverse.
+## 
+## 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 cacheSolve should retrieve the inverse from the cache.
 
-## Write a short comment describing this function
 
-makeCacheMatrix <- function(x = matrix()) {
+## Creates a special "matrix" object that can cache its inverse
 
+makeCacheMatrix <- function(x = matrix()) {
+        inverse <- NULL
+        set <- function(y) {
+                x <<- y
+                inverse <<- NULL
+        }
+        get <- function() x
+        setinverse <- function(solve) inverse <<- solve
+        getinverse <- function() inverse
+        list(set = set, get = get,
+             setinverse = setinverse,
+             getinverse = getinverse)
 }
 
 
-## Write a short comment describing this function
+## Computes the inverse of the special "matrix" returned by makeCacheMatrix 
 
 cacheSolve <- function(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
 }
+
+