R help - Dec 2004 - barplot() using beside=TRUE and the density argument

Hi

I am using barplot() to draw some barplots, with a matrix as the data so
that multiple bars are drawn for each data point.  I want to use the
argument "beside=TRUE" to juxtapose the bars instead of stacking them.

If I execute:

barplot(data,names.arg=names,density=c(20,10),beside=FALSE)

I get the expected behaviour i.e. the bottom part of the column is
shaded 20 lines per inch, the top part 10 lines per inch.  However, if I
try:

barplot(data,names.arg=names,density=c(20,10),beside=TRUE)

I don't get what *I* would expect (which admittedly might be the wrong
thing!).  What happens is that the left bar for each data point is
shaded 20 lines per inch, and the right bar is not shaded at all.

Any help would be very much appreciated.

Mick

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On Wed, 2004-12-01 at 10:46 +0000, michael watson (IAH-C)
wrote:
> Hi
> 
> I am using barplot() to draw some barplots, with a matrix as the data so
> that multiple bars are drawn for each data point.  I want to use the
> argument "beside=TRUE" to juxtapose the bars instead of stacking
them.
> 
> If I execute:
> 
> barplot(data,names.arg=names,density=c(20,10),beside=FALSE)
> 
> I get the expected behaviour i.e. the bottom part of the column is
> shaded 20 lines per inch, the top part 10 lines per inch.  However, if I
> try:
> 
> barplot(data,names.arg=names,density=c(20,10),beside=TRUE)
> 
> I don't get what *I* would expect (which admittedly might be the wrong
> thing!).  What happens is that the left bar for each data point is
> shaded 20 lines per inch, and the right bar is not shaded at all.
> 
> Any help would be very much appreciated.
> 
> Mick
Without a reproducible example, it is hard to know exactly what you are
seeing. 

Running the following example:

barplot(matrix(1:12, ncol = 6), density = c(20, 10), beside = TRUE)

I will admit that the right hand bars in the plot have a shading that is
very light and may be difficult to see on your system, but they are
there.

You might want to try the following:

barplot(matrix(1:12, ncol = 6), density = c(20, 10), 
        col = c("red", "blue"), beside = TRUE)

to see if the addition of color makes a difference, or if not, try to
increase the second density value.

If this does not help, please provide a reproducible example.

HTH,

Marc Schwartz