Update cachematrix.R

.Rhistory

@@ -0,0 +1,26 @@
+## This function creates a special "matrix" object that can cache its inverse.
+makeCacheMatrix <- function(x = matrix()) {
+inv <- NULL  # initialize inverse as NULL
+set <- function(y) {
+x <<- y       # assign new matrix value
+inv <<- NULL  # reset inverse cache
+}
+get <- function() x
+setinverse <- function(inverse) inv <<- inverse
+getinverse <- function() inv
+list(set = set, get = get,
+setinverse = setinverse,
+getinverse = getinverse)
+}
+## This function computes the inverse of the special "matrix" returned by makeCacheMatrix above.
+cacheSolve <- function(x, ...) {
+inv <- x$getinverse()
+if(!is.null(inv)) {
+message("getting cached data")
+return(inv)  # return cached inverse
+}
+data <- x$get()
+inv <- solve(data, ...)  # compute inverse
+x$setinverse(inv)        # cache the inverse
+inv
+}

cachematrix.R

@@ -1,15 +1,27 @@
-## Put comments here that give an overall description of what your
-## 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 <- NULL  # initialize inverse as NULL
+  set <- function(y) {
+    x <<- y       # assign new matrix value
+    inv <<- NULL  # reset inverse cache
+  }
+  get <- function() x
+  setinverse <- function(inverse) inv <<- inverse
+  getinverse <- function() inv
+  list(set = set, get = get,
+       setinverse = setinverse,
+       getinverse = getinverse)
 }
 
-
-## Write a short comment describing this function
-
+## This function computes the inverse of the special "matrix" returned by makeCacheMatrix above.
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+  inv <- x$getinverse()
+  if(!is.null(inv)) {
+    message("getting cached data")
+    return(inv)  # return cached inverse
+  }
+  data <- x$get()
+  inv <- solve(data, ...)  # compute inverse
+  x$setinverse(inv)        # cache the inverse
+  inv
 }