Creating Graphs in R

Graphing techniques Sharon style!(I am not sure if this is a good or bad thing but this is what I do...)

Basic graphical tools that I use...

lines(x, y, lty = “solid”, lwd = 1)

points(x , y, pch = 16, cex = 1)

arrows(x0, y0, x1, y1, length, angle, code)

text(x, y, labels, adj)

mtext(text, side, line)

axis(side, at, labels)

lines() This function is used to add lines to existing

graphs. The different line types are:

points() This function is used to add points to existing graphs.

Some of the different points are:

arrows()

code= argument specifies which ends of the arrows have an arrow head. code=1 produces a head at

the start of arrow, code=2 produces a head at

the end of the arrow code=3 produces a head at

both ends.2 4 6 8 10

02

46

810

Index

c(0:10)

text() text() draws the strings (text) given in the

vector labels at the coordinates given by x and y

Can be added to any part of the graph

mtext()

Text is written in one of the four margins of the current figure region or one of the outer margins of the device region.

Elements of the graph lines

points

arrows

text

mtext

axis

axis() This function give you control over the axis

labels. I use this to add the labels etc that I want on

the graph rather than using the default labels etc.

adj

The graph that provided the inspiration

The most important thing... Plan the process. Prepare your data. Work through getting one step correct before

moving to the next step. Don’t get overwhelmed by trying to do

everything at once. If you don’t succeed – try, try, try, try... again!

Useful links... http://users.monash.edu.au/~murray/AIMS-R-

users/ws/ws11.html

https://www.stat.auckland.ac.nz/~ihaka/120/Notes/ch03.pdf

www.zoologi.su.se/education/courseweb/statistics/Pimp_Your_Graph.pdf