[R] Histogram for each ID value

[Paul Hiemstra]

Hi,

When using ggplot, take a look at facet_wrap and geom_histogram.

regards,
Paul

On 10/17/2011 12:14 PM, Sarah Goslee wrote:
> Hi,
>
> On Mon, Oct 17, 2011 at 8:07 AM, a217 <ajn21 at case.edu> wrote:
>> I have a dataframe in the general format:
>>
>> chr1 0.5
>> chr1 0
>> chr1 0.75
>> chr2 0
>> chr2 0
>> chr3 1
>> chr3 1
>> chr3 0.5
>> chr7 0.75
>> chr9 1
>> chr9 1
>> chr22 0.5
>> chr22 0.5
> Using dput to give us some reproducible data would be even better.
>
>> where the first column is the chromosome location and the second column is
>> some value. What I'd like to do is have a histogram created for each chr
>> location (i.e. a separate histogram for chr1, chr2, chr3, chr7, chr9, and
>> chr22). I am just having a hard time getting everything to work out and am
>> hoping for some suggestions.
> And telling us what you've tried would also help.
>
> par(mfrow=c(2,3))
> hist(mydata[mydata[,1] == "chr1", 2])
> hist(mydata[mydata[,1] == "chr2", 2])
> hist(mydata[mydata[,1] == "chr3", 2])
> hist(mydata[mydata[,1] == "chr7", 2])
> hist(mydata[mydata[,1] == "chr9", 2])
> hist(mydata[mydata[,1] == "chr22", 2])
>
>
> So obviously that is completely untested because I don't have your
> sample data, but might give you the idea.
>
> Sarah


-- 
Paul Hiemstra, Ph.D.
Global Climate Division
Royal Netherlands Meteorological Institute (KNMI)
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