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cachematrix.R
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cachematrix.R
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## These functions make it possible to store a matrix in a special object and
## cache the value of a matrix's inverse, which is an expensive computation
## that should not be called repeatedly.
## Create an object that stores a matrix and a cached value of its inverse.
## The cached value must be set using the cacheSolve function defined below.
## WARNING! Do not call the setinverse function manually! It must be run in
## a controlled environment such as cacheSolve, which makes sure the inverse
## being passed in is the actual inverse of the matrix.
makeCacheMatrix <- function(x = matrix()) {
inv <- NULL
set <- function(y) {
x <<- y
inv <<- NULL
}
get <- function() x
setinverse <- function(inverse) inv <<- inverse
getinverse <- function() inv
list(set = set, get = get,
setinverse = setinverse,
getinverse = getinverse)
}
## Given a CacheMatrix, created by the makeCacheMatrix function, calculate the
## inverse of its stored matrix, and cache it using mackCacheMatrix$setinverse.
cacheSolve <- function(x, ...) {
## Return a matrix that is the inverse of 'x'
inv <- x$getinverse()
if(!is.null(inv)) {
message("getting cached data")
return(inv)
}
data <- x$get()
inv <- solve(data, ...)
x$setinverse(inv)
inv
}