cachematrix.R

## JHDSS_RProgramming_Week3; Assignment: Caching the Inverse of a Matrix
## functions for caching the inverse of a matrix

## makeCacheMatrix: This function creates a special "matrix" object that can cache its inverse.

makeCacheMatrix <- function(x = matrix()) {
        m <- NULL
        set <- function(y) {
                x <<- y
                m <<- NULL
        }
        get <- function() x
        setinv <- function(solve) m <<- solve ## solve gives inverse matrix
        getinv <- function() m
        list(set = set, get = get,
             setinv = setinv,
             getinv = getinv)
}


## 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, ...) {
        m <- x$getinv()
        if(!is.null(m)) {
                message("getting cached data")
                return(m)
        }
        data <- x$get()
        m <- solve(data, ...)
        x$setinv(m)
        m
}