[R] changing y-axis intervals in a boxplot

[David L Carlson]

This can also be done without the axis() function:

> par(las=1, mfrow=c(2,1))
> boxplot(count ~ spray, data = InsectSprays, yaxp=c(0, 25, 10),
cex.axis=0.6,
     col = "lightgray")
> boxplot(count ~ spray, data = InsectSprays, yaxp=c(0, 25, 25),
cex.axis=0.6, 
     col = "lightgray")

----------------------------------------------
David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352

> -----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
> >
> >
> 
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