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cachematrix.R
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42 lines (40 loc) · 1.47 KB
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## This file contains a pair of functions that cache the inverse of a matrix.
## Usage example:
## c=rbind(c(1, -1/4), c(-1/4, 1))
## fc <- makeCacheMatrix(c)
## inv <- cacheSolve(fc)
## calling the second time 'cacheSolve(fc)' will get inverse matrix from the cache.
## Creates a special "matrix" object that can cache its inverse,
## which is really a list containing a function to
## - set the value of the matrix
## - get the value of the matrix
## - set the value of the inverse of the matrix
## - get the value of the inverse of the matrix
makeCacheMatrix <- function(x = matrix()) {
inv <- NULL
set <- function(y) {
x <<- y
inv <<- NULL
}
get <- function() x
setinverse <- function(solve) inv <<- solve
getinverse <- function() inv
list(set = set, get = get,
setinverse = setinverse,
getinverse = getinverse)
}
## 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, ...) {
## 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(a = data, ...)
x$setinverse(inv)
inv
}