Programming Assisgnment 2

coder811 · coder811 · commit d8cda422f772 · 2015-05-24T16:19:13.000-07:00
Completed code for cachematrix programming assignment2
diff --git a/cachematrix.R b/cachematrix.R
@@ -1,15 +1,35 @@
-## Put comments here that give an overall description of what your
-## functions do
+## below are the functions that cache and compute the inverse of
+## a matrix
 
-## Write a short comment describing this function
-
-makeCacheMatrix <- function(x = matrix()) {
+## This function creates special "matrix" object that can cache its 
+## inverse
 
+makeCacheMatrix <- function(mtx = matrix()) {
+  inverse <- NULL
+  set <- function(x) {
+    mtx <<- x;
+    inverse <<- NULL;
+  }
+  get <- function() return(mtx);
+  setinv <- function(inv) inverse <<- inv;
+  getinv <- function() return(inverse);
+  return(list(set = set, get = get, setinv = setinv, getinv = getinv))
 }
 
 
-## Write a short comment describing this function
+## This function computes the inverse of the special "matrix"
+##returned by makecacheMatrix above. If inverse has been calculated
+## already, then cacheSolve Should retrieve the inverse the 
+## from the cache
 
-cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+cacheSolve <- function(mtx, ...) {
+  inverse <- mtx$getinv()
+  if(!is.null(inverse)) {
+    message("Getting cached data...")
+    return(inverse)
+  }
+  data <- mtx$get()
+  invserse <- solve(data, ...)
+  mtx$setinv(inverse)
+  return(inverse)
 }
