Update cachematrix.R

cachematrix.R

@@ -2,14 +2,38 @@
 ## functions do
 
 ## Write a short comment describing this function
+# This function creates a special "matrix" object that can cache its inverse.
 
 makeCacheMatrix <- function(x = matrix()) {
-
+  inv_x <- NULL
+  set <- function(y) {
+    x <<- y
+    inv_x <<- NULL
+  }
+  get <- function() x
+  setInv <- function(inverse) inv_x <<- inverse
+  getInv <- function() inv_x
+  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 (and the 
+# matrix has not changed), then the cachesolve should retrieve the inverse from 
+# the cache.
 
 cacheSolve <- function(x, ...) {
         ## Return a matrix that is the inverse of 'x'
+  inv_x <- x$getInv()
+  if (!is.null(inv_x)) {
+    message("Getting the cached data")
+    return(inv_x)
+  }
+
+  data<-x$get()
+  inv_x<-solve(data, ...)
+  x$setInv(inv_x)
+  inv_x
 }