[R] histogram cells

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From: Tommy E. Cathey (cathey.tommy@epa.gov)
Date: Sat 28 Jun 2003 - 09:02:24 EST


Message-id: <3EFCCD00.B5FD6DEB@epa.gov>

Why does the following code generate a Histogram of 7 cells
instead of 5?

Thanks for your help.
--Tommy

> data(islands)
> str(hist(sqrt(islands), br = 5, col="lightblue", border="pink"))
List of 7
 $ breaks : num [1:8] 0 20 40 60 80 100 120 140
 $ counts : int [1:7] 40 1 1 2 2 1 1
 $ intensities: num [1:7] 0.04167 0.00104 0.00104 0.00208 0.00208 ...
 $ density : num [1:7] 0.04167 0.00104 0.00104 0.00208 0.00208 ...
 $ mids : num [1:7] 10 30 50 70 90 110 130
 $ xname : chr "sqrt(islands)"
 $ equidist : logi TRUE
 - attr(*, "class")= chr "histogram"

--
Tommy E. Cathey, Senior Scientific Application Consultant
High Performance Computing & Scientific Visualization
SAIC, Supporting the EPA
Research Triangle Park, NC
919-541-1500 EMail: cathey.tommy@epa.gov
My e-mail does not reflect the opinion of SAIC or the EPA.

Federal Contact - John B. Smith 919-541-1087 - smith.johnb@epa.gov

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