R help - Mar 2012 - barplot and NA

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

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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> -----Original Message-----
> 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?
Yes, to the extent that the default barplot plots the height of the bar so far
as the sum of teh values so far, starting at teh first. For your first vector,
no problem; for your second, the highest value is undefiuned, for the third, the
sum is undefined after the second value (an NA) and so on.

Try adding 'beside=TRUE to the barplots, as in
barplot(d3, beside=TRUE)
and you will see all the known values plotted as you;d expect.

Steve E*******************************************************************
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