[R] by/ NA/ barplot

[Prof Brian Ripley]

On Wed, 4 Jul 2001, Jonathan Baron wrote:

> It's nice to hear that this problem might be a bug, and
> that it can be fixed with ylim.  I've been using the

I've put in a fix for 1.3.1.  Not sure what the intentions were, but if it
worked when ylim was set (for vertical barplots) it should work if it is
unset.

> following function to get around it for barplots of
> matrices.  So, for example, if m1 is a matrix, I say
> barplot(fill(m1))
>
> fill <- function(x) {x[x=="NA"]<-0 ; return(x)}

Ouch!  Use is.na(x) not x=="NA".  The first is a proper test for NA or
NaN.  The second coerces to character and tests equality of strings.  This
is slower and not quite the same:

> x <- c(0, 1, NA, 0/0)
> x
[1]   0   1  NA NaN
> is.na(x)
[1] FALSE FALSE  TRUE  TRUE
> x == "NA"
[1] FALSE FALSE  TRUE FALSE


-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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