Update cachematrix.R

zhangxudongsteven · zhangxudongsteven · commit 646d62b8cec6 · 2016-02-07T23:03:54.000+08:00
diff --git a/cachematrix.R b/cachematrix.R
@@ -4,12 +4,31 @@
 ## Write a short comment describing this function
 
 makeCacheMatrix <- function(x = matrix()) {
-
+        m <- NULL
+        set <- function(y) {
+                x <<- y
+                m <<- NULL
+        }
+        get <- function() x
+        setinverse <- function(inverse) m <<- inverse
+        getinverse <- function() m
+        list(set = set, get = get,
+             setinverse = setinverse,
+             getinverse = getinverse)
 }
 
 
 ## Write a short comment describing this function
 
 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
 }
