initial commit of makeCacheMatrix and cacheSolve

Author: Alexey Vorobiev

cachematrix.R

@@ -1,15 +1,36 @@
-## Put comments here that give an overall description of what your
-## functions do
-
-## Write a short comment describing this function
-
+## The first function, makeCacheMatrix creates a special "matrix", 
+## which is really a list containing a function to:
+## set the value of the matrix
+## get the value of the matrix
+## set the value of the inverse matrix
+## get the value of the inverse matrix
 makeCacheMatrix <- function(x = matrix()) {
-
+    im <- NULL
+    set <- function(y) {
+        x <<- y
+        inverseMatrix <<- NULL
+    }
+    get <- function() x
+    setinverse <- function(inverseMatrix) im <<- inverseMatrix
+    getinverse <- function() im
+    list(set = set, get = get,
+         setinverse = setinverse,
+         getinverse = getinverse)
 }
 
 
-## Write a short comment describing this function
+## The second function calulates inverse matrix, that is stored
+## in object function above, or returns cached inverse of the matrix
 
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+    ## Return a matrix that is the inverse of 'x'
+    im <- x$getinverse()
+    if(!is.null(im)) {
+        message("getting cached matrix")
+        return(im)
+    }
+    data <- x$get()
+    im <- solve(data)
+    x$setinverse(im)
+    im
 }