Caching the Inverse of a Matrix functions

unknown · unknown · commit 2762b7107602 · 2014-06-21T11:29:52.000-04:00
diff --git a/cachematrix.R b/cachematrix.R
@@ -1,15 +1,31 @@
-## Put comments here that give an overall description of what your
-## functions do
-
-## Write a short comment describing this function
+## The matrix inversion is usualy a costly operation. 
+## The set of functions below intended to cache matrix inverse
+## to save computational time on inverse calculartion.
 
+## This function creates a special "matrix" object that can cache its inverse.
 makeCacheMatrix <- function(x = matrix()) {
-
+	i <- NULL
+	set <- function(y) {
+		x <<- y
+		i <<- NULL
+	}
+	get <- function() x
+	setinv <- function(inverse) i <<- inverse
+	getinv <- function() i
+	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 the inverse has already been calculated, then the cachesolve should retrieve the inverse from the cache
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+	## Return a matrix that is the inverse of 'x'
+	i <- x$getinv()
+	if (!is.null(i)) {
+		return(i)
+	}
+	data <- x$get()
+	inverse <- solve(data, ...)
+	x$setinv(inverse)
+	inverse
 }
