Caching the Inverse of a Matrix

Author: ivan-selchenkov

cachematrix.R

@@ -1,15 +1,37 @@
-## Put comments here that give an overall description of what your
-## functions do
-
-## Write a short comment describing this function
+## This is a couple of functions which is used to cache
+## inverse of a matrix
 
+## Creates a special object to store inverse of a matrix
 makeCacheMatrix <- function(x = matrix()) {
-
+  inv <- NULL
+  
+  ## get & set original matrix (unused in this task)
+  set <- function(m) {
+    x <<- m
+    inv <<- NULL
+  }
+  get <- function() x
+  
+  ## get & set the inverse of a matrix
+  setinv <- function(inverse) inv <<- inverse
+  getinv <- function() inv
+  
+  list(set = set, get = get, setinv = setinv, getinv = getinv)  
 }
 
 
-## Write a short comment describing this function
-
+## Returns the inverse of matrix 'x'. 
+## If the inverse is not present in cache, will calculate it and store to cache.
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+  inv <- x$getinv()
+  
+  if(!is.null(inv)) {
+    message("getting cached data")
+    return (inv)
+  }
+  data <- x$get()
+  inv = solve(data, ...)
+  x$setinv(inv)
+  
+  inv
 }