# [R] barplot and NA

ilai keren at math.montana.edu
Mon Mar 12 17:23:36 CET 2012

``` d2 <- as.matrix(c(2,NA,4))
barplot(d2,beside=T)
barplot(c(d2))
barplot(na.omit(d2))
d2[2,] <- 0
barplot(d2)

# So barplot is not "stopping" at the first NA (first 2 plots). But
what does stacking even mean when you have a missing group in the
middle ? you can't expect barplot to know... if you think it means 0
and the rest can just be stacked on top - define it that way.

Cheers

On Sun, Mar 11, 2012 at 10:22 PM, John D. Muccigrosso
<internetj at muccigrosso.org> wrote:
> Am I wrong that barplot is supposed to just skip NAs, and continue with the rest of the data in a matrix column? That's how I read various posts on the subject.
>
> But that's not what happens for me with R64.app (on a Mac, obviously). For example:
>
> d0 <- as.matrix(c(2,3,4))
> d1 <- as.matrix(c(2,3,NA))
> d2 <- as.matrix(c(2,NA,4))
> d3 <- as.matrix(c(NA,3,4))
> barplot(d0)
> barplot(d1)
> barplot(d2)
> barplot(d3)
>
> generates four bar plots. The first has one bar with three visible bands, as expected. The second has two bands; still OK. But the third has only one band (at 2) and the fourth has none.
>
> So it appears that barplot is barfing on those NAs and stopping its plot at those points.
>
> Is that the expected behavior?
>
> Thanks.
>
> John
>
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