Hi Jim,
thanks for your reply, I will try using this instead!
best,
Laura
On Feb 24, 2012, at 3:09 AM, Jim Lemon wrote:
> On 02/24/2012 09:30 AM, Laura Matrajt wrote:
>>
>> Hi,
>> I found some weird behavior of the function multhist in the plotrix package
>> and I would like to ask you about it:
>> so, it works well to put two histograms next to each other, but I don't
>> understand the breaksÂ…
>> so for example,
>> library(plotrix)
>> mh<- list(rnorm(200, mean=100, sd=10), rnorm(200, mean=100, sd=10))
>> multhist(mh) #produces a plot with
>> 12 bins
>> multhist(mh, breaks=2) #produces a plot with 2 bins,
>> as expected
>> multhist(mh, breaks=3) #produces a plot with 4
>> bins???
>> multhist(mh, breaks=4) #produces a plot with 4 bins
>> multhist(mh, breaks=7) #produces a plot with 6
>> bins???
>>
>> etc. So odd number of breaks doesn't seem to work, and even more, some times
>> it does the lowest even number of bins (so if I put breaks=7 I will get 6
>> bins) but other times it does the highest even number of bins (so if I put
>> breaks=3 I get 4 bins)
>>
>> In addition, things become even worse when you try to add labels to the bins.
>>
>>
>> So, all this to say that I am trying to put two histograms side to side, and
>> put some correct number of bins and labelsÂ… does anyone have an idea of how
>> to do this?
>
> Hi Laura,
> This may be due to the way breaks are calculated when you just specify a
> suggested number of bins. However, when I tried this with barp:
>
> mhmat<-rbind(table(cut(mh[[1]],breaks=3)),
> table(cut(mh[[2]],breaks=3)))
> library(plotrix)
> barp(mhmat)
>
> I got what I expected, three groups of two bars. Perhaps this will do what
> you want.
>
> Jim
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