write functions and comments

Author: withrain

cachematrix.R

@@ -2,14 +2,34 @@
 ## functions do
 
 ## Write a short comment describing this function
-
+## This function generate a list object including matrix x and cache functions with closure
 makeCacheMatrix <- function(x = matrix()) {
-
+  m <- NULL
+  set <- function(y) {
+    x <<- y
+    m <<- NULL
+  }
+  get <- function() x
+  setsolve <- function(solve) m <<- solve
+  getsolve <- function() m
+  list(set = set, get = get,
+       setsolve = setsolve,
+       getsolve = getsolve)
 }
 
 
 ## Write a short comment describing this function
-
+## if object x has a cache, return cache data
+## Or calcuate inverse matrix with solve function and save to cache
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+  ## Return a matrix that is the inverse of 'x'
+  m <- x$getsolve()
+  if(!is.null(m)) {
+    message("getting cached data")
+    return(m)
+  }
+  data <- x$get()
+  m <- solve(data, ...)
+  x$setsolve(m)
+  m
 }