Cached matrix implementation

Author: enchantner

cachematrix.R

@@ -1,15 +1,41 @@
-## Put comments here that give an overall description of what your
-## functions do
+## Functions representing caching implementation of
+## calculating inverse of a matrix
 
-## Write a short comment describing this function
+## Returns an object (list), which is also cacheable
+## matrix with getter/setter for both data and cache
+## values
 
 makeCacheMatrix <- function(x = matrix()) {
-
+  # checking the input
+  if (!is.matrix(x)) stop("This argument doesn't look like a matrix")
+  i <- NULL
+  set <- function(y) {
+    x <<- y
+    i <<- NULL
+  }
+  get <- function() x
+  # setter and getter for an inverse
+  setinv <- function(inv) i <<- inv
+  getinv <- function() i
+  list(set = set, get = get,
+       setinv = setinv,
+       getinv = getinv)
 }
 
 
-## Write a short comment describing this function
+## Calculates inverse of a matrix returned by makeCacheMatrix
+## or returns cached value if it's present
 
-cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+cacheSolve <- function(inversible, ...) {
+  inv <- inversible$getinv()
+  # checking if inverce value is already in cache
+  if(!is.null(inv)) {
+    message("Getting cached inverse value")
+    return(inv)
+  }
+  # calculating inverse if cache is empty
+  data <- inversible$get()
+  inv <- solve(a=data, ...)
+  inversible$setinv(inv)
+  inv
 }