initial commit

Author: rohioc

cachematrix.R

@@ -1,15 +1,52 @@
-## Put comments here that give an overall description of what your
-## functions do
+## These functions cache a given matrix inversion to conserve 
+## repeating the computationally complex inversion calculation.
+## For the given matrix it will only be calculated once.
 
-## Write a short comment describing this function
 
+## makeCacheMatrix provides the functions to get and set the matrix
+## as well as get and set the inverse
 makeCacheMatrix <- function(x = matrix()) {
-
+  m <- NULL
+  set <- function(y) {
+    x <<- y
+    m <<- NULL
+  }
+  get <- function() x
+  setinverse <- function(inverse) m <<- inverse
+  getinverse <- function() m
+  list(set = set, get = get,
+       setinverse = setinverse,
+       getinverse = getinverse)
 }
 
 
-## Write a short comment describing this function
-
-cacheSolve <- function(x, ...) {
+## cacheinverse calculates the matrix inverse if it is not cached
+## and reads the cache if it is available intead of calculating
+cacheinverse <- function(x, ...) {
         ## Return a matrix that is the inverse of 'x'
+  m <- x$getinverse()
+  if(!is.null(m)) {
+    message("getting cached data")
+    return(m)
+  }
+  data <- x$get()
+  m <- solve(data, ...)
+  x$setinverse(m)
+  m
 }
+
+## test console session
+##
+# > x <- rbind(c(4,7),c(2,6))
+# > a <- makeCacheMatrix(x)
+# > cacheinverse(a)
+# [,1] [,2]
+# [1,]  0.6 -0.7
+# [2,] -0.2  0.4
+# > cacheinverse(a)
+# getting cached data
+# [,1] [,2]
+# [1,]  0.6 -0.7
+# [2,] -0.2  0.4
+# >
+