changing y-axis intervals in a boxplot

par(las=1, mfrow=c(2,1))
boxplot(count ~ spray, data = InsectSprays, yaxp=c(0, 25, 10),

boxplot(count ~ spray, data = InsectSprays, yaxp=c(0, 25, 25),

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org] On Behalf Of Pascal Oettli
Sent: Friday, March 29, 2013 6:33 AM
Cc: 'r-help at r-project.org'
Subject: Re: [R] changing y-axis intervals in a boxplot

Every week, I learn something new with R-help.

Pascal


On 29/03/13 20:23, Jim Lemon wrote:

And if you would like to be able to read the crowded axis:

boxplot(count ~ spray, data = InsectSprays, col = "lightgray",

yaxt='n')

library(plotrix)
staxlab(2, at=seq(0,25,1),cex=0.8)

Jim


On 03/29/2013 08:36 PM, Pascal Oettli wrote:

Hi,

Example adapted from ?boxplot

par(las=1, mfrow=c(2,1))
boxplot(count ~ spray, data = InsectSprays, col = "lightgray",

yaxt='n')

axis(2, at=seq(0,25,2.5))
boxplot(count ~ spray, data = InsectSprays, col = "lightgray",

yaxt='n')

axis(2, at=seq(0,25,1))

HTH,
Pascal


On 29/03/13 18:22, Berg, Tobias van den wrote:

Thank you Pascal but unfortunelately i still didn't figure out how

to

change the numbers presented at the y-axis.

I looked up your suggestions but if I'm right, yaxt can set if the
axis is presented (yaxt="s") or suppressed (yaxt="n") which does

not

help for changing the values on the y-axis.

The 'at' argument did solve my problem but in a clumsy way.

Although

I'm happy that I managed, does anyone know how to do the same job

in a

more convenient way?

This is the 'clumsy' code I used:

boxplot((fitted(finalfit4) *100) ~
instabilitydata2$MRI_Diag_Instab_rev, ylim=c(0,100), xlab="MRA
diagnosis", ylab="Predicted probability (%)")
axis(side=2, at="10")
axis(side=2, at="30")
axis(side=2, at="50")
axis(side=2, at="70")
axis(side=2, at="90")

Kind regards,

Tobias

-----Oorspronkelijk bericht-----
Van: Pascal Oettli [mailto:kridox at ymail.com]
Verzonden: vrijdag 29 maart 2013 8:44
Aan: Berg, Tobias van den
CC: 'r-help at r-project.org'
Onderwerp: Re: [R] changing y-axis intervals in a boxplot

Hello,

?par (particularly the 'yaxt' argument)
?axis ('side' and 'at' arguments)

Hope this help,
Pascal



On 29/03/13 16:37, Berg, Tobias van den wrote:

Dear R-users,

I'm a bit of a rooky in R and do not know how to change the y-axis
intervals of a boxplot.

The y-axis in my boxplot ranges from 0 to 100 which is fine. The
problem is the interval level in between. Now it increases with

steps

of 20 but I'd like to have it changed by steps of 5.

Anyone knows how to do this in R?

I used the following code for producing this boxplot:
boxplot((fitted(finalfit4) *100) ~
instabilitydata2$MRI_Diag_Instab_rev, ylim=c(0,100), xlab="MRA
diagnosis", ylab="Predicted probability (%)")


Kind regards, Tobias