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r part1 Cheat Sheet (DRAFT) by

This is a Summary of the Lecture 1

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Basic operators and functions

==
exact equality
 
!=
unequal
 
>
bigger
 
<
smaller
 
>=
bigger or equal
 
<=
smaller or equal
 
+
addition
 
-
subtra­ction
 
*
multip­lic­ation
 
/
division
 
^
power
 
sqrt(x)
square root
 
exp(x)
expone­ntial
 
log(x)
logarithm
 
sin(x)
sine
 
cos(x)
cosine
 
tan(x)
tangent
 
range(x)
range min max
 
min(x)
minimum
 
max(x)
maximum
 
length(x)
number of elementsn
 
sum(x)
sum
 
mean(x)
mean
 
var(x)
variance
R as a giant pocket calculator (**Basics)

Commands and Assign­ments

Valid names?
.name1

name.1

name.var_1
Help commands?
help.start()

help.search("something")

help(function)

?function

apropos("something")
Commands?
x<-­24+10

{x<­-24+10; sqrt(9); 1+1}

assign­("x", 1+1)
Matrix?
data <- 

c(1,2,­3,4­,5,­6,7­,8,9)

matrix­(da­ta,­nrow=3,

ncol=3­,by­row­=TRUE)
(** Basics)
  

Relax?

fortune()
is a function from the fortunes package that contains anecdotes
(*Addi­tional)

CRAN task views

install.packages("ctv")

library(ctv)

available.views()

install.views("Psychometrics",  

coreOnly=TRUE)

update.views("Psychometrics")  


MORE
(**Basics)
  

Cats!

(*Relax)
Intro to R for cats and cat lovers
Package catter­plots to make plots with cats