[R] changing y-axis intervals in a boxplot

[Pascal Oettli]

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
>
>