finish

Author: SeaCelo

cachematrix.R

@@ -1,15 +1,38 @@
-## Put comments here that give an overall description of what your
-## functions do
+## Function returns the inverse of a square matrix. It does not check that the matrix
+## is invertible.
+## The function first calls the cache function to see if the result has already been 
+## computed and either returns the cache or computes the inverse
+## The function call is: cacheSolve(makeCacheMatrix(x))
+## where x is the invertible matrix.
 
 ## Write a short comment describing this function
 
 makeCacheMatrix <- function(x = matrix()) {
-
+        m <- NULL               # initializes m
+        set <- function(y) {
+                x <<- y         # x survives the end of the function to pass to next
+                m <<- NULL      # resets m to NULL and survives the end of the function
+        }
+        get <- function() x     # returns just x
+        setinverse <- function(solve) m <<- solve #the computed value is set into the list here
+        getinverse <- function() m
+        list(set = set, get = get,
+             setinverse = setinverse,
+             getinverse = getinverse)
 }
 
 
 ## Write a short comment describing this function
 
 cacheSolve <- function(x, ...) {
         ## Return a matrix that is the inverse of 'x'
+        m <- x$getinverse()  #gets the matrix m from above and tests if it's NULL
+        if(!is.null(m)) {    #if not NULL, returns its value
+                message("getting cached data")
+                return(m)
+        }
+        data <- x$get()     #just gets x from above
+        m <- solve(data, ...)  #compute here
+        x$setinverse(m)    #sets the cache in the function setinverse() above
+        m
 }