Code Lab 1 Intro

class: center, middle, inverse, title-slide

# Code Lab 1 Intro
### Hannah L. Owens
### 2020-10-12

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# Plan for today

* Brief introduction to problem solving in R
* Introduction to tutorial interface
* Interactive problem-solving exercises!

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# Problem solving in R
![](https://img.etimg.com/thumb/msid-76642954,width-650,imgsize-330838,,resizemode-4,quality-100/although-a-separate-court-case-established-early-holmes-novels-are-in-the-public-domain-the-lawsuit-alleges-the-detective-only-developed-feelings-in-the-last-10-books-.jpg)

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# First, some words of encouragement

### "I can break code all day regardless of the data source." - Hannah Owens

### "Programming allows you to think about thinking, and while debugging you learn about learning." - Nicholas Negroponte

### "The most effective debugging tool is still careful thought, coupled with judiciously placed print statements." - Brian Kerninghan

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# Some tips on troubleshooting

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# Some tips on troubleshooting

* What is the error?
  * Pay attention to line marks
  * Read error messages
    * When error message makes no sense, Google it!
* Ask for help
  * People you know
  * StackOverflow, GitHub, Reddit, Twitter, etc.
* Walk away (but come back)

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# Some tips on troubleshooting: Print statements
* Where is the error?
* Why is there an error?

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# Some tips on troubleshooting: Print statements

.pull-left[

```r
testFunction <* function(y){
  if (y %% 2==0){
    return("notOdd")
  } else return()
}

x <* c()
for(i in 1:3){
  print(i)
  print("executing function")
  newI <* testFunction(i)
  print(paste("newI: ", newI))
  print("appending new i")
  x <* c(x,newI)
  print(x)
}
```
]

.pull-right[

```
## [1] 1
## [1] "executing function"
## [1] "newI:  "
## [1] "appending new i"
## NULL
## [1] 2
## [1] "executing function"
## [1] "newI:  notOdd"
## [1] "appending new i"
## [1] "notOdd"
## [1] 3
## [1] "executing function"
## [1] "newI:  "
## [1] "appending new i"
## [1] "notOdd"
```
]

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# Introduction to tutorial interface

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# Introduction to tutorial interface
* You will get a link to an R tutorial.
* You will be split into breakout rooms.
* As a group, you will work to solve each problem.
* In between problems, we will regroup to discuss.

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# Introduction to tutorial interface

.pull-left[
* A tutorial is a special kind of interactive R interface, powered by Shiny.
* Shiny is a framework for building web applications using R code.
* The app is published on the shiny.io server
  * You don't even need to have a functioning version of R set up on your machine!
]

.pull-right[
<img src="https://www.libraries.rutgers.edu/sites/default/files/styles/resize_to_300px_width/public/events/2019/09/shiny.png?itok=Nr_Xx5T6" width=300>
]

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# A brief tour of the interface
Tutorial app location: https://hannah-owens.shinyapps.io/CodeLab_1/