[R] Generating a vector for breaks in a histogram
michael watson (IAH-C)
michael.watson at bbsrc.ac.uk
Thu Jul 3 15:48:04 CEST 2003
Fantastic. You're right, I was looking for seq().
However, my plan for using it for hist() was foiled!
I thought if I did something like:
> b <- seq(0,500,10)
> hist(myvble,breaks=b)
It would bin myvble into the bins 0-50,50-100,100-150 etc and in that way I could ensure that two histograms are on the same scale with the same bins!
I get the following error:
Error in hist.default(Cy5, breaks = s) : some 'x' not counted; maybe 'breaks' do not span range of 'x'
Now this makes sense of course, my bins probably DON'T span the entire range of X. SOOOOO I am still left with the same problem:
1) two variables
2) I want to draw histograms of both
3) I want them to have the SAME x-y scale on the graph
4) I want them to have the SAME bin range
How do i do it? Any suggestions?
Cheers
Mick
-----Original Message-----
From: Hotz, T. [mailto:th50 at leicester.ac.uk]
Sent: 03 July 2003 14:16
To: michael watson (IAH-C); r-help at stat.math.ethz.ch
Subject: RE: [R] Generating a vector for breaks in a histogram
Dear Mick,
Have a look at ?seq - seq(1,20,length=20) should do it.
HTH
Thomas
---
Thomas Hotz
Research Associate in Medical Statistics
University of Leicester
United Kingdom
Department of Epidemiology and Public Health
22-28 Princess Road West
Leicester
LE1 6TP
Tel +44 116 252-5410
Fax +44 116 252-5423
Division of Medicine for the Elderly
Department of Medicine
The Glenfield Hospital
Leicester
LE3 9QP
Tel +44 116 256-3643
Fax +44 116 232-2976
> -----Original Message-----
> From: michael watson (IAH-C) [mailto:michael.watson at bbsrc.ac.uk]
> Sent: 03 July 2003 14:02
> To: 'r-help at stat.math.ethz.ch'
> Subject: [R] Generating a vector for breaks in a histogram
>
>
> Hi
>
> I have two lots of numbers which I would like to histogram
> using the hist() function. For comparative reasons, I want
> them to be on the same scale, which I can use the xlim and
> ylim options to achieve.
>
> However, having them on the same scale is meaningless unless
> they have the same "breaks". Consulting the documentation,
> there are 4 ways of defining the number of breaks, only one
> of which is "definite", the others merely form suggestions,
> which I have found is not good enough.
>
> The only definite way is to provide a vector to the hist()
> function which is a vector of the break points for the
> histogram. So I need to generate a vector that contains say,
> 500, numbers in it, equi-distance apart between a min and a max. EG:
>
> > myfunc(n=20,min=1,max=20)
>
> would provide a vector, length 20, with the numbers 1 through
> 20 in it.
>
> Is there a function in R that can do this?
>
> Thanks
> Mick
>
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