Added functionality for caching matrix inverse

Author: dym

cachematrix.R

@@ -1,15 +1,40 @@
-## Put comments here that give an overall description of what your
-## functions do
-
-## Write a short comment describing this function
+## Matrix inversion is usually a costly computation, this module creates an API
+## to cache the inverse of a matrix rather than compute it repeatedly
 
+## makeCacheMatrix: This function creates a special "matrix" object that
+##                  can cache its inverse.
 makeCacheMatrix <- function(x = matrix()) {
+    inv <- NULL
 
-}
+    set <- function(y) {
+        x <<- y
+        inv <<- NULL
+    }
+    get <- function() x
 
+    setsolve <- function(solve) inv <<- solve
+    getsolve <- function() inv
+
+    list(set = set,
+         get = get,
+         setsolve = setsolve,
+         getsolve = getsolve)
+}
 
-## Write a short comment describing this function
 
+## cacheSolve: This function computes the inverse of the special "matrix"
+##             returned by makeCacheMatrix above. If the inverse has
+##             already been calculated (and the matrix has not changed),
+##             then the cachesolve should retrieve the inverse from the cache.
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+    ## Return a matrix that is the inverse of 'x'
+    inv <- x$getsolve()
+    if(!is.null(inv)) {
+        message("getting cached data")
+        return(inv)
+    }
+    data <- x$get()
+    inv <- solve(data)
+    x$setsolve(inv)
+    inv
 }