Module # 2 Assignment

I have downloaded and reviewed the import instructions. 


Evaluate myMean Function: 

Initial Code: 

assignment2 <- c(16, 18, 14, 22, 27, 17, 19, 17, 17, 22, 20, 22)

myMean <- function(assignment2) {

  return(sum(assignment) / length(someData))

}

myMean(assignment2)

Output: 
> myMean(assignment2)
Error in myMean(assignment2) : object 'assignment' not found

Corrected Code: 
assignment2 <- c(16, 18, 14, 22, 27, 17, 19, 17, 17, 22, 20, 22)
myMean <- function(assignment2) {
  return(sum(assignment2) / length(assignment2))
}

myMean(assignment2)

Output: 
> myMean(assignment2)
[1] 19.25
> 

Explanation: 
The provided myMean function generated an error message indicating that an object was not found when I tested it in RStudio using the vector "assignment2". This happened because the code tried to use variable names (assignment and "someData") that weren't supplied as arguments or defined within the function. Because R functions only accept variables that are either generated inside the function body or passed in as parameters, the function failed. Despite being successfully given into the function, "assignment2" was never utilized in the computation. Rather, the problem was caused by the function referring to nonexistent variables.


Comments

Post a Comment

Popular posts from this blog

Assignment #1

Image
GitHub link:  https://github.com/rayhankhan-svg/r-programming-assignments R and RStudio:  I ran into a few little setup and system compatibility problems when installing R and RStudio. R was easy to install from CRAN, however at first I wasn't sure which version to obtain for my operating system. I verified the correct installer for my OS after carefully examining the CRAN download page, and I continued without any more issues. The installation of RStudio went quite smoothly as well, but in order for RStudio to properly identify R, I had to make sure R was fully installed first.  Another problem I ran into was that when I first launched RStudio, output did not appear in the Console right away. The Console started operating regularly after restarting RStudio and confirming that R was correctly installed and identified in the system path. Also I verified that both R and RStudio were running the most recent versions by looking up their versions in the Console. By paying...
Read more

Module # 6 Doing math in R part 2

Github Link: https://github.com/rayhankhan-svg/r-programming-assignments R Code:  # 1) Matrices A and B A <- matrix(c(2,0,1,3), ncol=2) B <- matrix(c(5,2,4,-1), ncol=2) A B # a) A + B A_plus_B <- A + B A_plus_B # b) A - B A_minus_B <- A - B A_minus_B # 2) diag() matrix size 4 with diagonal values 4,1,2,3 D <- diag(c(4,1,2,3)) D # 3) Generate the 5x5 matrix using diag() M <- diag(3, 5)      # start with 3s on the diagonal M[1, 2:5] <- 1       # first row (cols 2-5) become 1 M[2:5, 1] <- 2       # first column (rows 2-5) become 2 M Output:  > # 1) Matrices A and B > A <- matrix(c(2,0,1,3), ncol=2) > B <- matrix(c(5,2,4,-1), ncol=2) >  > A      [,1] [,2] [1,]    2    1 [2,]    0    3 > B      [,1] [,2] [1,]    5    4 [2,]    2   -1 >  > # a) A + B ...
Read more

Module # 3 data.frame

Code Repository: https://github.com/rayhankhan-svg/r-programming-assignments/blob/main/README.md R Code:  # Create vectors Name <- c("Jeb", "Donald", "Ted", "Marco", "Carly", "Hillary", "Bernie") ABC <- c(4, 62, 51, 21, 2, 14, 15) CBS <- c(12, 75, 43, 19, 1, 21, 19) # Create data frame poll_results <- data.frame(Name, ABC, CBS) # View data frame poll_results # Compare polls poll_results$Difference <- poll_results$CBS - poll_results$ABC poll_results Output:  > # Compare polls > poll_results$Difference <- poll_results$CBS - poll_results$ABC > poll_results      Name ABC CBS Difference 1     Jeb   4  12          8 2  Donald  62  75         13 3     Ted  51  43         -8 4   Marco  21  19         -2 5   Carly   2   1...
Read more