rdpeng#1

Author: LucreziaRo

ProgrammingAssignment2.Rproj

@@ -0,0 +1,13 @@
+Version: 1.0
+
+RestoreWorkspace: Default
+SaveWorkspace: Default
+AlwaysSaveHistory: Default
+
+EnableCodeIndexing: Yes
+UseSpacesForTab: Yes
+NumSpacesForTab: 2
+Encoding: UTF-8
+
+RnwWeave: Sweave
+LaTeX: pdfLaTeX

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
+## at first we create a special "matrix" object that can cache its inverse
 
 makeCacheMatrix <- function(x = matrix()) {
-
+  inv <- NULL
+  set <- function(y){
+    x <<- y
+    inv <<- NULL
+  }
+  get <- function() x
+  setInverse <- function(solveMatrix) inv <<- solveMatrix
+  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" if it's not available in cache
 
 cacheSolve <- function(x, ...) {
         ## Return a matrix that is the inverse of 'x'
+  inv <- x$getInverse()
+  if(!is.null(inv)){
+    message("getting data from cache")
+    return(inv)
+  }
+  data <- x$get()
+  inv <- solve(data)
+  x$setInverse(inv)
+  inv
 }