[R] scatterplot to boxplot translation?

[Uwe Ligges]

On 09.12.2011 20:41, Vining, Kelly wrote:
> Thanks for the tip on "cut," seems like it should work. I must still be missing something, though. Here, I'm cutting on the y variable, then attempting the boxplot:
>
> cutRPKM<- cut(count$RPKM, breaks=4)
>
> head(cutRPKM)
> [1] (-0.0995,24.8] (-0.0995,24.8] (-0.0995,24.8] (-0.0995,24.8] (-0.0995,24.8]
> [6] (-0.0995,24.8]
> Levels: (-0.0995,24.8] (24.8,49.8] (49.8,74.7] (74.7,99.6]
>
> boxplot(as.numeric(cutRPKM))
>
> This gives me a single box instead of five boxes. ??


You obviously want:

boxplot(count$RPKM ~ cut(count$RPKM, breaks=seq(0, max(count$RPKM), 
by=100)))


Uwe Ligges


> Thanks again,
> --Kelly V.
> ________________________________________
> From: David Winsemius [dwinsemius at comcast.net]
> Sent: Friday, December 09, 2011 11:14 AM
> To: Vining, Kelly
> Cc: r-help at r-project.org
> Subject: Re: [R] scatterplot to boxplot translation?
>
> On Dec 9, 2011, at 2:11 PM, Vining, Kelly wrote:
>
>> My apologies if anyone is seeing this twice...looks like my previous
>> message didn't come through...
>>
>> Dear UseRs,
>> I have a feeling this is a relatively simple question, but I'm
>> having a hard time getting my head around it. I have a simple x-y
>> scatterplot with many points, as shown below(attached). I'd like to
>> make a boxplot of this by interval, such that there is one box
>> representing the points in the 0-100 interval, one for the 101-200
>> interval, and so on. How do I structure my R data frame to be able
>> to generate such a boxplot?
>>
>
> ?cut
>
>>
>> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org
>> ] On Behalf Of Vining, Kelly
>> Sent: Friday, December 09, 2011 11:01 AM
>> To: r-help at r-project.org
>> Subject: [R] scatterplot to boxplot translation?
>>
>>
>> <C_count_vs_RPKM.png>______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
> David Winsemius, MD
> West Hartford, CT
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.