my commit

Author: Anirban Chakraborty

cachematrix.R

@@ -1,15 +1,47 @@
-## Put comments here that give an overall description of what your
-## functions do
+## Caching the Inverse of a Matrix:
+## Matrix inversion is usually a costly computation and there may be some 
+## benefit to caching the inverse of a matrix rather than compute it repeatedly.
+## Below are a pair of functions that are used to create a special object that 
+## stores a matrix and caches its inverse.
 
-## Write a short comment describing this function
+## This function creates a special "matrix" object that can cache its inverse.
 
-makeCacheMatrix <- function(x = matrix()) {
 
+makeCacheMatrix <- function(x = matrix()) {
+    m <- NULL
+    set <- function(y) {
+        x <<- y
+        m <<- NULL
+    }
+    get <- function() x
+    set_inverse <- function(inverse) {
+        m <<- inverse
+    } 
+    get_inverse <- function() m
+    list(set = set, get = get,
+         set_inverse = set_inverse,
+         get_inverse = get_inverse)
 }
 
 
-## Write a short comment describing this function
+## This function computes the inverse of the special "matrix" created by 
+## makeCacheMatrix above. If the inverse has already been calculated (and the 
+## matrix has not changed), then it should retrieve the inverse from the cache.
+
 
 cacheSolve <- function(x, ...) {
-        ## Return a matrix that is the inverse of 'x'
+    m <- x$get_inverse()
+    if(!is.null(m)){
+        message("getting cached data")
+        return(m)
+    }
+    data <- x$get()
+    m <- solve(data, ...)
+    x$set_inverse(m)
+    m
 }
+
+
+
+
+