[R] barplot: different colors for the bar and the strips

[Marc Schwartz]

On Thu, 2006-09-07 at 06:18 -0500, Hao Chen wrote:
> Hi,
> 
> I am using barplot and would like to know if it is possible to have bars
> filled with one color while use a different color for the shading lines. 
> 
> The following code colors the shading lines, leaving the bars in white:
> 
>  barplot(1:5, col=c(1:5), density=c(1:5)*5)
> 
> while the colors are applied to the bars when density is removed.
> 
>  barplot(1:5, col=c(1:5))
> 
> I did check ?barplot and found the following: 
> 
> 	col: a vector of colors for the bars or bar components. 
>  
>  Thanks,
> 
>  Hao

Note the key word 'or' in the description of the 'col' argument.

You need to make two separate calls to barplot(). The first using the
fill colors, then the second using the shading lines AND setting 'add =
TRUE', so that the second plot overwrites the first without clearing the
plot device.

 barplot(1:5, col=c(1:5))

 barplot(1:5, col = "black", density=c(1:5), add = TRUE)

Just be sure that any other arguments, such as axis limits, are
identical between the two calls.

HTH,

Marc Schwartz