functions to calculate and cache inverse of a matrix

Author: glance

cachematrix.R

@@ -1,15 +1,42 @@
-## Put comments here that give an overall description of what your
-## functions do
-
-## Write a short comment describing this function
+## Funtions to cache the inverse of matrix.
+##  Inverse is calculated and stored the first time cacheSolve is called. 
+##    Subsequent calls return the stored inverse value
+## Usage instruction
+##  Call makeCacheMatrix passing in matrix to be inversed 
+##  Call cacheSolve passing in the value returned by makeCacheMatrix
 
+## Creates object that will cache inverse of the matrix. Pass resulting object
+##      to cacheSolve as parameters 
+##  parameter: matrix to be inversed
 makeCacheMatrix <- function(x = matrix()) {
-
+    s <- NULL
+    set <- function(y) {
+        x <<- y
+        s <<- NULL
+    }
+    get <- function() x
+    setsolve <- function(solve) s <<- solve
+    getsolve <- function() s
+    list(set = set, get = get,
+         setsolve = setsolve,
+         getsolve = getsolve)
+    invisible()
 }
 
 
-## Write a short comment describing this function
-
+## Calculates inverse of a matrix and stores results. Subsequent calls return
+##      stored value
+##  Parameter: pass in object returned by makeCacheMatrix
+##  Return: inverse of passed matrix
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+    s <- x$getsolve()
+    if(!is.null(s)) {
+        message("getting cached data")
+        return(s)
+    }
+    data <- x$get()
+    s <- solve(data, ...)
+    x$setsolve(s)
+    ## Returns matrix that is the inverse of 'x'
+    s
 }