zx8754 / StackOverflowNotes

SO [r] tag list of dupes, help, links, etc.

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StackOverflowNotes

About

This is all documented in TFM. Those who WTFM don't want to have to WTFM again on the mailing list. RTFM.
(Barry Rowlingson, R-help, October 2003)

To rephrase above quote for StackOverflow [R]: Most of questions have been asked before. Those who answer them don't want to answer them again and again. Use the links.

Comments

  • [Jon Skeet: StackOverflow Question Checklist](https://codeblog.jonskeet.uk/2012/11/24/stack-overflow-question-checklist/)
  • [How to make a great R reproducible example?](http://stackoverflow.com/questions/5963269)
  • For questions that are not [on-topic](http://stackoverflow.com/help/on-topic), you might want to try in the [R-Public chatroom](http://chat.stackoverflow.com/rooms/25312/r-public).
  • [How to make a Shiny app reproducible example?](https://stackoverflow.com/questions/48343080)
  • [How to create a Minimal, Complete, and Verifiable example](http://stackoverflow.com/help/mcve)
  • [What does it mean when an answer is "accepted"?](http://stackoverflow.com/help/accepted-answer)
  • Welcome to StackOverflow! Please read the info about [how to ask a good question](http://stackoverflow.com/help/how-to-ask) and how to give a [reproducible example](http://stackoverflow.com/questions/5963269). This will make it much easier for others to help you. - Jaap
  • Not An Answer - This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post - you can always comment on your own posts, and once you [earn](http://meta.stackexchange.com/q/146472/228487) sufficient [reputation](http://stackoverflow.com/help/whats-reputation) you will be able to [comment](http://stackoverflow.com/help/privileges/comment) on any post. If you have a related but different question, [ask a new question](http://stackoverflow.com/questions/ask) referencing this one if it will help provide context. – BhargavRao
  • Duplicate FAQ: Please read the FAQ [How should duplicate questions be handled?](http://meta.stackexchange.com/q/10841/): "It's a duplicate. What do I do?; If you have the privilege to vote to close, click the "close" button under the question, select “duplicate of...”, and paste a link to the duplicate question."; "Should I answer it?; No, not if you think it's a duplicate.".
  • Duplicate FAQ: Please also read [The Wikipedia of Long Tail Programming Questions](https://blog.stackoverflow.com/2011/01/the-wikipedia-of-long-tail-programming-questions/). "When you see a question that seems like it might reflect a common problem, don't just answer it to get a few points. That doesn't make the Internet any better. Instead, help us build up a library of canonical questions and answers that are more generic versions of the same question". Also, "Don't answer questions that have already been answered elsewhere. Yeah, you might earn a couple of points of reputation, but, because you are duplicating content, you are actually making the internet worse".
  • StackOverflow is not a code review service. There is codereview.stackexchange.com for that. If you want to get help - please provide a **minimal** reproducible example, your desired output and show what you've tired. Try reducing this to a specific problem as much a possible. See [here](http://stackoverflow.com/questions/5963269). - David Arenburg
  • Answers (even correct ones) are not useful if they contribute to the demise of the site, [we need to downvote the answers to bad questions](http://meta.stackoverflow.com/a/252531) - George Cummins
  • While the sentiment is appreciated, StackOverflow deprecates [using comments to say "thank you"](http://meta.stackoverflow.com/q/258004); if this answer was useful you can upvote it (if you have sufficient reputation), and in any case if it answers your question satisfactorily you are encouraged to click the check-mark to accept it. - Ben Bolker

Package issues

  • [How should I deal with “package 'xxx' is not available (for R version x.y.z)” warning?](http://stackoverflow.com/questions/25721884)

Error

  • [Error: could not find function … in R](http://stackoverflow.com/questions/7027288)
  • [Syntax errors: mismatch {, if else, etc.](https://stackoverflow.com/questions/25889234)

Joins

  • [How to join (merge) data frames (inner, outer, left, right)?](http://stackoverflow.com/questions/1299871)
  • [roll join with start/end window](http://stackoverflow.com/questions/24480031)

Grouping functions

  • [apply family, by, aggregate](http://stackoverflow.com/questions/3505701)
  • [Group by sum](http://stackoverflow.com/questions/1660124)
  • [Group by paste](http://stackoverflow.com/questions/15933958)
  • [Group by X, Y, Z FUN()](http://stackoverflow.com/questions/9723208)
  • [Group by X FUN_1() FUN_2() FUN_N()](http://stackoverflow.com/questions/12064202)
  • [Group by fill/collapse NAs](http://stackoverflow.com/questions/28509462)
  • [Group by fill NAs](https://stackoverflow.com/questions/23340150)
  • [Group by count](http://stackoverflow.com/questions/9809166)
  • [Group by distinct count](https://stackoverflow.com/questions/12840294)
  • [Group by top_n](http://stackoverflow.com/questions/27766054)

RTFM

  • All the posts with r-faq tag: https://stackoverflow.com/questions/tagged/r-faq
  • [What do the %op% operators in mean in R? for example “%in%”](https://stackoverflow.com/q/12730629)
  • [Order of operator precedence](https://stackoverflow.com/q/24095238)

Reshape

  • [Reshape data from long to wide format](http://stackoverflow.com/questions/5890584)
  • [Reshape data from wide to long format](http://stackoverflow.com/questions/2185252)

Sort/Order

  • [Sort a dataframe by column(s)?](http://stackoverflow.com/questions/1296646)

Floating points

  • [Why are these numbers not equal?](http://stackoverflow.com/questions/9508518)
  • [Round up from 0.5](https://stackoverflow.com/questions/12688717/)

Dates

  • [Date difference in weeks, months, quarters, and years](http://stackoverflow.com/questions/14454476)

Regex:

  • [Learning Regular Expressions](http://stackoverflow.com/questions/4736)

Comment formatting

http://stackoverflow.com/editing-help#comment-formatting

SE Extensions

Functions

# Author: http://stackoverflow.com/users/1270695/ananda-mahto
# http://chat.stackoverflow.com/transcript/message/11673110#11673110
snarkments <- function(choice = "Reproduce and be merry") {
  A <- c("Reproduce and be merry" = "Please provide a [minimal reproducible example](http://stackoverflow.com/q/5963269/1270695), and please show us what you have tried",
         "lmgtfy" = "I suppose you have [searched](http://stackoverflow.com/help/how-to-ask) for your problem on SO?",
         "catkiller!" = "Die!!! Die!!! Die!!!")
  unname(A[choice])
}

Usage:

snarkments()
# [1] "Please provide a [minimal reproducible example](http://stackoverflow.com/q/5963269/1270695), and please show us what you have tried"
snarkments("lmgtfy")
# [1] "I suppose you have [searched](http://stackoverflow.com/help/how-to-ask) for your problem on SO?"
snarkments("catkiller!")
# [1] "Die!!! Die!!! Die!!!"

r-public Canonicals