Assignment version 1.

Author: igordsm

cachematrix.R

@@ -4,12 +4,32 @@
 ## Write a short comment describing this function
 
 makeCacheMatrix <- function(x = matrix()) {
-
+  inv = NULL
+  set = function (y) {
+    x <<- y
+    inv <<- NULL
+  }
+  get = function () x
+  
+  getinv = function () inv
+  setinv = function (iv) {
+    inv <<- iv
+  }
+  list(set = set, get = get, getinv = getinv, setinv = setinv)
 }
 
 
 ## Write a short comment describing this function
 
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+  inv = x$getinv()
+  if (!is.null(inv)) {
+    message("cache!")
+    return (inv)
+  } else {
+    x_data = x$get()
+    inv = solve(x_data)
+    x$setinv(inv)
+    inv
+  }
 }