oliryc/programmingassignment2

Repository for Programming Assignment 2 for R Programming on Coursera

Introduction

Welcome in the repository of my second programming assignment.

1. makeCacheMatrix: This function creates a special "matrix" object that can cache its inverse.
2. cacheSolve: 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.

Function: makeCacheMatrix

The makeCacheMatrix function creates a special "matrix", which is able to cache a value

makeCacheMatrix <- function(x) {
        m <- NULL
        # Set the value of the Matrix
        set <- function(y) {
                x <<- y
                m <<- NULL
        }
        # Get the value of the Matrix
        get <- function() x
        # Set the value of the mean
        setInv <- function(inv) m <<- inv
        # Get the value of the mean
        getInv <- function() m
        #
        list(set = set, get = get,
             setInv = setInv,
             getInv = getInv)
}

The following function calculates the inverse of the special "matrix" created with the above function.

Function: cacheSolve

cacheSolve <- function(x, ...) {
        # Checks to see if the inverse has already been calculated. 
        m <- x$getInv()
        if(!is.null(m)) { 
                message("getting cached data")
                # Gets the inversed matrix from the cache and skips the computation.
                return(m)
        }
        data <- x$get()
        # Calculates the inverse of the data
        m <- solve(data, ...)
        # Sets the value of the mean in the cache via the setmean function.
        x$setInv(m)
        m
}

Run them:

Here are few lines to test the functions in R:

mat <- matrix(1:4, ncol = 2, nrow = 2, byrow = TRUE)
matC <- makeCacheMatrix(mat)
cacheSolve(matC)
cacheSolve(matC)