An introduction to R for plant pathologists written by Dr. Sydney E. Everhart, Nikita Gambhir, Dr. Lucky Mehra, and Dr. Zhian N. Kamvar. At Kansas State Unversity, the workshop was taught by Dr. Lucky Mehra and Dr. Daljit Singh, and teaching assistance was provided by Dylan Mangel and Nar Ranabhat.

This repository is intended to serve as an additional resource for a short workshop given at Kansas State Univeristy. The source code can be found at https://github.com/mehraKSU/Intro_R_2019_REEU.

This introduction to R is designed to be a companion to a workshop lasting 4 hours introducing plant pathologists to the basics of R by using a field data example.

## Goals

As a result of taking this workshop you should be able to:

• load tabular data into R
• understand the basics of data manipulation in R
• know what a data frame, vector, and function are
• summarize data
• visualize data
• troubleshoot commmon problems

## Website

This website is meant to serve as a companion to the workshop. The pages located in the Workshop tab are rendered versions of R scripts located in the top level of https://github.com/mehraKSU/Intro_R_2019_REEU. As the workshop is designed to be interactive where the participants are given some control over what direction we should take the analyses, the scripts here are only to serve as guidelines.

• R code is presented how it would appear in the R console with the first line prefixed with > and subsequent lines prefixed with +. The intent is to encourage the user to type the commands instead of copy and paste.
• There will be instances where we will have exercise questions. These are points in the workshop where we stop the participants and ask them to figure out the working of a function or find a suitable function to answer the illustrated problem.

The website located at https://mehraksu.github.io/Intro_R_2019_REEU/ can be build via the make program:

make clean # run this to build the site from scratch
make

You can also go to Environment, History,…. pane in RStudio, click Build > More > Clean and Rebuild to make the website from scratch.

Note: if the README.md is changed, make will force-update the index.Rmd and in turn force update the corresponding HTML.