[R] bar charts
Roger.Bivand at nhh.no
Fri Dec 10 12:14:48 CET 2004
On Fri, 10 Dec 2004, Leonardo Lami wrote:
> I'd like plot a bar graphic of a array.
> I'd like to have the values of the single columns as juxtaposed bars (like in
> "barplot" with beside=TRUE) and I'd like to have the values of the single
> columns expressed like percentage of the sum of the coloumn.
> In this way all the bars are composed by the sum of the percentage of the
> values of a coloumn (with different colors) and all they have 100% value.
If I understand you correctly, something like:
> tab <- xtabs(breaks ~ tension + wool, data = warpbreaks)
> barplot(tab, beside=TRUE)
is what you have, and what you want is:
> barplot(apply(tab, 2, function(x) (100*x)/sum(x)), beside=TRUE)
> colSums(apply(tab, 2, function(x) (100*x)/sum(x)))
You'll need a good explanatory caption, though, when the column sums are
> Leonardo Lami
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Breiviksveien 40, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 93 93
e-mail: Roger.Bivand at nhh.no
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