Completed assignment rdpeng#2

pedrokost · pedrokost · commit f726c05c0e8d · 2014-05-09T22:30:46.000+01:00
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,3 @@
+.Rproj.user
+.Rhistory
+.RData
diff --git a/RProgrammingAssignment2.Rproj b/RProgrammingAssignment2.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
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
+##  makeCacheMatrix and cacheSolve are a pair of functions that
+##  allow efficient repeated computation of a matrix inverse
 
-## Write a short comment describing this function
+##  Returns a special matrix that is able to cache its inverse
 
 makeCacheMatrix <- function(x = matrix()) {
-
+  inv <- NULL
+  set <- function(y) {
+    x <<- y
+    inv <<- NULL
+  }
+  get <- function() x
+  setinv <- function(inverse) inv <<- inverse
+  getinv <- function() inv
+  list(set=set, get=get, setinv=setinv, getinv=getinv)
 }
 
 
-## Write a short comment describing this function
+## Returns the inverse of a spacial matrix
 
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+  inv <- x$getinv()
+  if (!is.null(inv)) {
+    message("getting cached data")
+    return(inv)
+  }
+  data <- x$get()
+  inv <- solve(data, ...)
+  x$setinv(inv)
+  inv
 }
