Update cachematrix.R #3
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This is good because now I am done with the homework and will enjoy a beer.
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A pair of functions that cache the inverse of a matrix: makeCacheMatrix cacheSolve Added more comments to bring clarity to the program Should be run in the command line/terminal this way: rdpeng#1. pass a square matrix to makeCacheMatrix (example: A=matrix(c(1,2,3,4), nrow=2, ncol=2) rdpeng#2 cache the inverse with cacheSolve(A) rdpeng#3 access the cached inverse with cacheSolve(A)
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This is the first draft for programming assignment rdpeng#3.
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Cache Matrix
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Edited sample functions to complete assignment rdpeng#3: makeCacheMatrix() and cacheSolve() defined.
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Edit rdpeng#3
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Fixed minor typos
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This reverts commit 20cca16.
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cachematrix_AL
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Updates for Programming Assignment rdpeng#3
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This is my submitted solution to the invert matrix/store matrix in cache assignment.
izie
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Coursera Assignment rdpeng#3
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Committed rdpeng#3
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…s inverse. #1. set value of the matrix rdpeng#2. get value of the matrix rdpeng#3. set value of the inverse rdpeng#4. get value of the inversemakeCacheMatrix <- function(x = matrix()) { j <- NULL set <- function(y) { x <<- y j <<- NULL } get <- function() x setinverse <- function(solve) j <<- solve getinverse <- function() j list(set = set, get = get, setinverse = setinverse, getinverse = getinverse) } ## `cacheSolve` function computes the inverse of the "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. ## when giving: Error in x$getinverse : $ operator is invalid for atomic vectors cachesolve <- function(x, ...) { i<- x$getinverse() if(!is.null(j)) { message("getting cached data") return(j) } data <- x$get() j<- solve(data, ...) x$setinverse(j) j } ## makeCacheMatrix function creates a "matrix" object that caches its inverse. #1. set value of the matrix rdpeng#2. get value of the matrix rdpeng#3. set value of the inverse rdpeng#4. get value of the inversemakeCacheMatrix <- function(x = matrix()) { j <- NULL set <- function(y) { x <<- y j <<- NULL } get <- function() x setinverse <- function(solve) j <<- solve getinverse <- function() j list(set = set, get = get, setinverse = setinverse, getinverse = getinverse) } ## `cacheSolve` function computes the inverse of the "matrix" returned by `makeCacheMatrix` above. #If the inverse has already been calculated (and the matrix has not changed), then`cacheSolve` should retrieve the inverse from the cache. ## when giving: Error in x$getinverse : $ operator is invalid for atomic vectors cachesolve <- function(x, ...) { i<- x$getinverse() if(!is.null(j)) { message("getting cached data") return(j) } data <- x$get() j<- solve(data, ...) x$setinverse(j) j }
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Test criteria: 1) matrixObj <- makeCacheMatrix(matrix(1:4, 2, 2)) 2) matrixObj$getInverse() ## Returns NULL since matrix has not been solved yet 3) cacheSolve(matrixObj) ## Solves and returns matrix object 4) cacheSolve(matrixObj) rdpeng#3 Retruns matrix object from cache 5) matrixObj <- makeCacheMatrix(matrix(1:9, 3, 3)) 6) cacheSolve(matrixObj) ## Returns message: Matrix is singular and cannot be inversed and stops
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Feb 27, 2018
makeCacheMatrix <- function(x = matrix()) {
inv <- NULL
set <- function(y) { rdpeng#2
x <<- y
inv <<- NULL
}
get <- function() x rdpeng#1
setinverse <- function(inverse) inv <<- inverse rdpeng#3
getinverse <- function() inv rdpeng#4
list(set=set, get=get, setinverse=setinverse,getinverse=getinverse)
}
#This function returns the inverse of matrix,
#it checks if the inverse has already been returned first. If so, it gets the result.
#if not, it retrieve the matrix from cache
cacheSolve <- function(x, ...) {
## Return a matrix that is the inverse of 'x'
inv <- x$getinverse{ ##Chitra's comment- Unexpected '{'
if(!is.null(inv)){
message('getting cached data')
return (inv)
} #Chitra's comment- If I run this code in R - I get an error stating object 'inv' not found
data <- x$get() #Chitra's comment- $ operator is unexpected here
inv <- solve(data) #Chitra's comment- R is not able to coerce type 'closure' to vector type 'any'
x$setinverse(inv) #Chitra's comment- $ is unexpected
inv #Chitra's comment- Object 'inv' not found
} #Chitra's comment- unexpected '}'
}
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megmcginn
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Oct 14, 2019
programming assignment - cacheMatrix
JoanCamiloMina
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Aug 27, 2020
Using Cache to store the calculation of the inverse of a matrix, using the concept of a constructive function that generates a list of function to access a set through cache the inverse of the matrix
kenyasmiles
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Oct 13, 2020
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