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cachematrix.R
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cachematrix.R
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## Two functions for Assignment 2, i.e. makeCacheMatrix and cacheSolve.
## These functions allow you to cache the inverse of a matrix.
## This allows us to save some time rather than running the computation again.
## The first function creates a special matrix object that can cache its inverse.
makeCacheMatrix <- function(x = matrix()) {
## - set the value of the matrix
invrs <- NULL
set <- function(y) {
x <<- y
invrs <<- NULL
}
## - get the value of the matrix
get <- function() x
## - set the value of the inverse of a matrix
setinvrs <- function(inverse) invrs <<- inverse
## - get the value of the inverse of a matrix
getinvrs <- function() invrs
list(set = set,
get = get,
setinvrs = setinvrs,
getinvrs = getinvrs)
}
## This function computes the inverse of the special matrix returned by makeCacheMatrix above.
cacheSolve <- function(x, ...) {
## If the inverse has been calculated, cacheSolve returns that cached inverse and saves processing time.
## Return a matrix that is the inverse of 'x'
invrs <- x$getinvrs()
if(!is.null(invrs)) {
message("getting the cached data")
return(invrs)
}
## If it has not been created, then cacheSolve calculates the inverse and caches it.
data <- x$get()
invrs <- solve(data, ...)
x$setinvrs(invrs)
invrs
}