forked from rdpeng/ProgrammingAssignment2
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathcachematrix.R
More file actions
37 lines (31 loc) · 963 Bytes
/
Copy pathcachematrix.R
File metadata and controls
37 lines (31 loc) · 963 Bytes
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
## 2 functions to create a special object that stores a matrix and cache its inverse
## makeCacheMatrix returns a list containing functions 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(x = matrix()) {
i<-NULL
set<-function(y){
x<<-y
i<<-NULL
}
get<-function() x
setinverse<-function(inverse) i<<-inverse
getinverse<-function() i
list(set=set, get=get, setinverse=setinverse, getinverse=getinverse)
}
## cacheSolve calculates the inverse of the matrix created above.
## But it first checks to see if it has been calculated. If so, it skips the calculation.
## If not, it does the calculation and updates the cache.
cacheSolve <- function(x, ...) {
i<-x$getinverse()
if(!is.null(i)){
message("getting cached data")
return(i)
}
data<-x$get()
i<-solve(data,...)
x$setinverse(i)
i
}