matrix function

lbarrett · lbarrett · commit 22853d9d1bde · 2015-05-21T21:59:50.000-04:00
diff --git a/cachematrix.R b/cachematrix.R
@@ -2,14 +2,47 @@
 ## functions do
 
 ## Write a short comment describing this function
+## The function sets and gets the matrix and its inverse
 
 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
+## the function calculates the inverse of the matrix created above.
+## checks to see if inverse is empty and if not uses cached inverse
 
 cacheSolve <- 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
 }
+
+#to test you do like this:
+#>mat1 = matrix(r, nrow=10, ncol=10)
+#>x = makeCacheMatrix(mat1)
+#>cacheSolve(x)
+#and you get the answer very fast! Repeat to see message
+#or read in matrix like this:
+#temp= read.csv("testfile.csv")
+#temp1 <- as.matrix(temp)
+#x = makeCacheMatrix(temp1)
+#...etc. but don't forget R assumes header and
+#it will complain matrix not square if u forget!!!
