1. CSCI N207 Data Analysis Using Spreadsheet
Expressions
Department of Computer and Information Science
IUPUI

2. Expressions
String(text) value must be enclosed in single or double quotes
paste() will connect objects together, sep=‘’ option means to connect without using spaces
c() – combine elements into a vector

3. Symbols Symbols You can assign a value to a symbol (variable)
You can change the value of the variable
You can assign the value of a variable
to another variable
Assignment operator ← takes the value
evaluated from the right hand side and
assignment the value to the variable
on the left hand side

4. Symbols Symbols Variable names are case sensitive
Some names are reserved key words by R, thus cannot be used as variable names, e.g. if, else, repeat, for, while, in, function, TRUE, FALSE, NULL etc
You can write a series of expressions on separate lines or in one line separated by semi colons

5. User-Defined Functions
You can create a user-defined function that performs a particular task designed by you.
You need to define a function name, and/or input parameter(s), and the operations (function definition)
When you use(call) a function, give the function name and the actual input values (function call)

6. Conditional Statements
if/else statements
if (condition) {statement block}
If the condition is true, run the statement block
if (condition) {statement block 1} else {statement block 2}
If the condition is true, run statement block 1
otherwise, run statement block 2

7. Save Your Code
You can save all the contents in R Console by clicking on “File”, then “Save to File”. You will be asked to save the file as a .txt file. Enter a file name and make sure .txt is part of the file name, e.g. max.txt.
You may want to clean up
the .txt file, e.g. deleting
error messages or additional
codes.
This is the easiest way
to save your codes at this
moment. Another way will be
introduced later.