caching matrix

rubyist · rubyist · commit c1797702be10 · 2015-04-25T10:31:04.000-04:00
diff --git a/cachematrix.R b/cachematrix.R
@@ -1,15 +1,32 @@
-## Put comments here that give an overall description of what your
-## functions do
+## These functions provide a method of caching matrix inversions
 
-## Write a short comment describing this function
+## makeCacheMatrix creates an object wrapping a matrix that allows the calculated
+## inverse to be cached.
 
 makeCacheMatrix <- function(x = matrix()) {
-
+  i <- NULL
+  set <- function(y) {
+    x <<- y
+    i <<- NULL
+  }
+  
+  get <- function() x
+  setsolve <- function(inv) i <<- inv
+  getsolve <- function() i
+  list(set = set, get = get, setsolve = setsolve, getsolve = getsolve)
 }
 
 
-## Write a short comment describing this function
+## cacheSolve will invert a matrix created by makeCacheMatrix and cache the results,
+## returning a matrix that is the inverse of 'x'.
 
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+  i <- x$getsolve()
+  if (!is.null(i)) {
+    return(i)
+  }
+  m <- x$get()
+  i <- solve(m, ...)
+  x$setsolve(i)
+  i
 }
