[R] Cannot reproduce tutorial results

[Bert Gunter]

This is a plain text list and your html post below is pretty mangled and
difficult to read. If you re-post in plain text, you are more likely to get
a response.

Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Fri, Feb 22, 2019 at 1:11 PM Jason Hernandez via R-help <
r-help using r-project.org> wrote:

> I have come back to trying to learn R after a long time away, and have
> begun with the YouTube tutorial videos by David Langer, as seen
> here Introduction to Data Science with R - Data Analysis Part 1. I am using
> R Studio with R version 3.4.4 (2018-03-15) -- "Someone to Lean On"
> Around 1:16:00 in the video Langer creates a new variable using an else if
> loop:
> extractTitle <- function(name) {     name <- as.character(name)
>  if(length(grep("Miss.", name)) > 0) {       return("Miss.")     } else
> if(length(grep("Master.", name)) > 0) {       return("Master.")     } else
> if(length(grep("Mrs.", name)) > 0) {       return("Mrs.")     } else
> if(length(grep("Mr.", name)) > 0) {       return("Mr.")     } else {
> return("Other.") }}
> titles <- NULLfor(i in 1:nrow(data.combined)) {     titles <- c(title,
> extractTitle(data.combined[i, "name"])) }
> data.combined$title <- as.factor(titles)
> There are two problems I see in my attempt to replicate this. First, the
> data.combined set contains 1309 names, but when I try to create the
> variable "titles" using this code, it creates a list of 2. When I use
> View(titles), what comes up is the first item on the list is
> function (main = NULL, sub = NULL, xlab = NULL, ylab = NULL, line = NA,
> outer = FALSE, ...)
> and the second item in the list is just the title "Master."
> The second problem is that after I enter data.combined$title <-
> as.factor(titles) I get the error message
> Error in sort.list(y) : 'x' must be atomic for 'sort.list'Have you called
> 'sort' on a list?
>
> If I try changing the as.factor to as.vector, I get
> Error in `$<-.data.frame`(`*tmp*`, title, value = list(function (main =
> NULL, : replacement has 2 rows, data has 1309
>
> I have checked and rechecked my code, and it is identical to Langer's.
> What is wrong here?
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> Introduction to Data Science with R - Data Analysis Part 1
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> Part 1 in a in-depth hands-on tutorial introducing the viewer to Data
> Science with R programming. The video prov...
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> and provide commented, minimal, self-contained, reproducible code.
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