[R] probability histogram question
Joseph LeBouton
lebouton at msu.edu
Fri Aug 20 01:56:41 CEST 2004
Hello, all;
I get an unexpected result when trying to plot a probability histogram
with R1.9.1 on windows xp:
#with the following code:
> x <- runif(100,0,1)
> hist(x)
> hist(x, freq=F)
> h <- hist(x, freq=F)
> summary(h)
# Length Class Mode
#breaks 11 -none- numeric
#counts 10 -none- numeric
#intensities 10 -none- numeric
#density 10 -none- numeric
#mids 10 -none- numeric
#xname 1 -none- character
#equidist 1 -none- logical
# The help file says that <h$density> holds the values
# plotted in the probability histogram. If that's the
# case, I'd expect that the sum of h$density for a histogram
where freq=F would equal 1.0 ... However:
> sum(h$density)
#returns the value :
#[1] 10
I would really like to plot values in the probablility histogram that
sum to 1, not 10. Is there a switch in the hist(x) command that I'm
missing? Or, is there another function that can do this?
Thanks in advance,
jlb
--
************************************
Joseph P. LeBouton
Forest Ecology PhD Candidate
Department of Forestry
Michigan State University
East Lansing, Michigan 48824
Office phone: 517-355-7744
email: lebouton at msu.edu
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