[R] plot numeric vs character

Ivan Calandra ivan.calandra at univ-reims.fr
Thu Mar 17 12:01:14 CET 2016


Thanks Petr,

You're right, no need for points().
But is there an even simpler way? I still find it strange that plot() 
does not allow points to be plotted instead of boxplots when x is a 
factor (because boxplots do not always make sense). Is there a good 
reason for that?

Ivan

--
Ivan Calandra, PhD
University of Reims Champagne-Ardenne
GEGENAA - EA 3795
CREA - 2 esplanade Roland Garros
51100 Reims, France
+33(0)3 26 77 36 89
ivan.calandra at univ-reims.fr
--
https://www.researchgate.net/profile/Ivan_Calandra
https://publons.com/author/705639/

Le 17/03/2016 11:48, PIKAL Petr a écrit :
> Hi
>
> It would be easier if mydf$let was factor
>
> plot(as.numeric(factor(mydf$let)), mydf$num, xaxt="n")
> axis(1, at=1:3, levels(factor(mydf$let)))
>
> Cheers
> Petr
>
>
>> -----Original Message-----
>> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Ivan
>> Calandra
>> Sent: Thursday, March 17, 2016 11:30 AM
>> To: R list
>> Cc: Anne CANER
>> Subject: [R] plot numeric vs character
>>
>> Dear useRs,
>>
>> I would like to plot data points in a simple scatterplot. I don't have
>> a lot of data per category, so a boxplot does not make sense.
>>
>> Here are some sample data:
>> mydf <- data.frame(let=rep(letters[1:3],each=3), num=rnorm(9),
>> stringsAsFactors=FALSE)
>>
>> I would like to do that, which throws an error, most likely because x
>> is
>> character:
>> plot(mydf$let, mydf$num)
>>
>> If I convert to factor(), it plots a boxplot with no possibility
>> (AFAIK) to plot points:
>> mydf$let <- factor(mydf$let)
>> plot(mydf$let, mydf$num, type='p')
>>
>> I know I can use the function points() in a somewhat convoluted manner:
>> plot(mydf$num, xlim=c(1,3), type='n', xaxt='n') axis(side=1, at=1:3,
>> labels=levels(mydf$let)) points(as.numeric(mydf$let), mydf$num)
>>
>> Isn't there a simple(r) way? Maybe I just missed something obvious...
>>
>> Thank you in advance for your help,
>> Ivan
>>
>> --
>> Ivan Calandra, PhD
>> University of Reims Champagne-Ardenne
>> GEGENAA - EA 3795
>> CREA - 2 esplanade Roland Garros
>> 51100 Reims, France
>> +33(0)3 26 77 36 89
>> ivan.calandra at univ-reims.fr
>> --
>> https://www.researchgate.net/profile/Ivan_Calandra
>> https://publons.com/author/705639/
>>
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