matrix solution

gitreset · gitreset · commit e32725e2d13c · 2014-05-22T01:25:10.000-07:00
diff --git a/cachematrix.R b/cachematrix.R
@@ -1,15 +1,40 @@
-## Put comments here that give an overall description of what your
-## functions do
-
-## Write a short comment describing this function
-
-makeCacheMatrix <- function(x = matrix()) {
-
-}
-
-
-## Write a short comment describing this function
-
-cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
-}
+## Put comments here that give an overall description of what your
+## functions do
+
+## Write a short comment describing this function
+
+makeCacheMatrix <- function(x = matrix()) {
+  m <- NULL
+  set <- function(y) {
+    x <<- y
+    m <<- NULL
+  }
+  get <- function() x
+  setinverse <- function(solve) m <<- solve
+  getinverse <- function() m
+  list(set = set, get = get, setinverse = setinverse, getinverse = getinverse)
+
+}
+
+
+## Write a short comment describing this function
+
+cacheSolve <- function(x, ...) {
+  m <- x$getinverse()
+  if(!is.null(m)) {
+    message ("getting cached inverse matrix")
+    return(m)
+  }
+  message("Don't have computation cached. Calculating inverse of input matrix...")
+  data <- x$get()
+  m <- solve(data)
+  x$setinverse(m)
+  m
+}
+
+a <- matrix(c(1:9), nrow= 3, ncol = 3)
+a[[2,2]] <- 0
+a
+b <- makeCacheMatrix(a)
+cacheSolve(b)
+
