[R] Determine breaks based on a break type...

[Kehl Dániel]

Hi,

you possibly know that there are a lot of methods to determine the number of bins. As a default R has the Sturges method. I think it does something like

x <- runif(100)
mybreaks <- hist(runif(x))$breaks

r <- max(x)-min(x)
br <- nclass.Sturges(x) #note this is a really simple approach and see edit(nclass.Sturges)
brn <- 0:br
pretty(min(x)+brn*r/br, n=br)

I tried to make the steps clear, the pretty function does the job in the end.

Hope that helps (although I do not know if it is faster, but you can try it on your own), best
daniel
________________________________________
Feladó: r-help-bounces at r-project.org [r-help-bounces at r-project.org] ; meghatalmazó: Jonathan Greenberg [jgrn at illinois.edu]
Küldve: 2014. március 22. 17:15
To: r-help
Tárgy: [R] Determine breaks based on a break type...

R-helpers:

I was wondering, given a vector of data, if there is a way to
calculate the break points based on the breaks= parameter from
histogram, but skipping all the other calculations (all I want is the
breakpoints, not the frequencies).  I can, of course, simply run the
histogram and extract the break component:

mybreaks <- hist(runif(100))$breaks

But is there a faster way to do this, if this is all I want?

--j

--
Jonathan A. Greenberg, PhD
Assistant Professor
Global Environmental Analysis and Remote Sensing (GEARS) Laboratory
Department of Geography and Geographic Information Science
University of Illinois at Urbana-Champaign
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Champaign, IL  61820-6371
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http://www.geog.illinois.edu/~jgrn/
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