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cachematrix.R
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36 lines (33 loc) · 1.2 KB
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## Function in the file provide a simple API for caching matrix inversion
## result.
## Matrix inversion operation is usually a costly computation and there may be
## some benefit to caching the inverse of a matrix rather than compute it
## repeatedly.
## This function creates a special "matrix" object that can cache its inverse.
makeCacheMatrix <- function(x = matrix()) {
inv <- NULL
set <- function(y) {
x <<- y
inv <<- NULL
}
get <- function() x
setinv <- function(mean) inv <<- mean
getinv <- function() 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, ...) {
## Return a matrix that is the inverse of 'x'
xinv <- x$getinv()
if(!is.null(xinv)) {
message("getting cached data")
return(xinv)
}
m <- x$get()
xinv <- solve(m)
x$setinv(xinv)
xinv
}