[R] changing y-axis intervals in a boxplot

[Pascal Oettli]

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
>>
>>
>>
>> 	[[alternative HTML version deleted]]
>>
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>