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cachematrix.R
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cachematrix.R
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## Put comments here that give an overall description of what your
## functions do
## Write a short comment describing this function
makeCacheMatrix <- function(x = matrix()) {
inv_matrix <- NULL # store the cached inverse matrix
# Function 1: Set the matrix
set <- function(y)
{
x <<- y
inv_matrix <<- NULL
}
# Function 2: Get the matrix
get <- function() x
# Function 3: Set the inverse
setinverse <- function(inverse) inv_matrix <<- inverse
# Function 4: Get the inverse
getinverse <- function() inv_matrix
# List of 4 functions: set, get, setinverse, getinverse
list(set= set, get = get, setinverse = setinverse, getinverse = getinverse)
}
## Write a short comment describing this function
# cacheSolve: Compute the inverse matrix if it has not been calculated before
cacheSolve <- function(x, ...) {
## Return a matrix that is the inverse of 'x'
inv_matrix <- x$getinverse()
if (!is.null(inv_matrix)) # inv_matrix different from null
{
message("getting cached data")
return(inv_matrix)
}
# Calculation of inverse matrix
data <- x$get()
inv_matrix <- solve(data, ...)
x$setinverse(inv_matrix)
inv_matrix # return the inv_matrix
}