cachematrix.R

## Matrix inversion is usually a costly computation and there may be some
## benefit to caching the inverse of a matrix rather than computing it
## repeatedly

## This function creates a special "matrix" object that can cache its inverse

makeCacheMatrix <- function(x = matrix()) {
  s <- NULL
  set <- function(y) {
    x <<- y
    s <<- NULL
  }
  get <- function() x
  setSolve <- function(sol) s <<- sol
  getSolve <- function() s
  list(set = set, get = get,
       setSolve = setSolve,
       getSolve = getSolve)
}


## 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 cacheSolve should retrieve the inverse from
## the cache

cacheSolve <- function(x, ...) {
  s <- x$getSolve()
  if(!is.null(s)) {
    message("getting cached data")
    return(s)
  }
  data <- x$get()
  s <- solve(data, ...)
  x$setSolve(s)
  s
}