Changes to be committed:

	modified:   cachematrix.R

Author: kevinyang1704

cachematrix.R

@@ -1,15 +1,61 @@
-## Put comments here that give an overall description of what your
-## functions do
+## makeCachematrix creates a special list of functions
+## that calculate inverse of a matrix and caches it
 
-## Write a short comment describing this function
+## This function creates a special "matrix" object that can 
+##cache its inverse.
 
 makeCacheMatrix <- function(x = matrix()) {
-
+  I <- NULL
+  set <- function(y) {
+    x <<- y
+    I <<- NULL
+  }
+  get <- function() x
+  setinv <- function(solve) I <<- solve
+  getinv <- function () I
+  list (set = set, get = get,
+        setinv = setinv,
+        getinv = getinv)
 }
 
+makeVector <- function(x = numeric()) {
+  m <- NULL
+  set <- function(y) {
+    x <<- y
+    m <<- NULL
+  }
+  get <- function() x
+  setmean <- function(mean) m <<- mean
+  getmean <- function() m
+  list(set = set, get = get,
+       setmean = setmean,
+       getmean = getmean)
+}
 
-## Write a short comment describing this function
+## This function computes the inverse of the special "matrix" 
+##returned by makeCacheMatrix above.
 
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of '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,...)
+  x$setinv(I)
+  I
 }
+
+cachemean <- function(x, ...) {
+  m <- x$getmean()
+  if(!is.null(m)) {
+    message("getting cached data")
+    return(m)
+  }
+  data <- x$get()
+  m <- mean(data, ...)
+  x$setmean(m)
+  m
+}