ProgrammingAssignment2/cachematrix.R at master · rexminnis/ProgrammingAssignment2 · GitHub

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## This function creates a special "matrix" object that can cache its inverse.
## This is really a list containing a function to
#
# 1.   set the value of the matrix
# 2.   get the value of the matrix
# 3.   set the value of the inverse
# 4.   get the value of the inverse

makeCacheMatrix <- function(my_x = matrix()) {
    my_inv <- NULL
    set <- function(x) {
        my_x <<- x;
        my_inv <<- NULL;
    }
    get <- function() my_x;
    setinv <- function(inv) my_inv <<- inv;
    getinv <- function() my_inv;
    list(set=set,
         get=get,
         setinv=setinv,
         getinv=getinv)
}

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