[R] barchart with bars attached to y=0-line

[Gabor Grothendieck]

You could do it without a panel function using xyplot and type "h" :

df2 <- transform(df, Compound = factor(abbreviate(Compound)))
xyplot(Ratio ~ Compound | Class, df2, type = c("h", "g"), lwd = 7,
	par.settings = list(grid.pars = list(lineend = 1)))


On Wed, Jul 16, 2008 at 6:48 AM, Henning Wildhagen <HWildhagen at gmx.de> wrote:
> Dear R users,
>
> i am using the following code to produce barcharts with lattice:
>
> Compound<-c("Glutamine", "Arginine", "Glutamate", "Glycine", "Serine",
> "Glucose", "Fructose", "Raffinose",
> "Glycerol", "Galacglycerol", "Threitol", "Galactinol", "Galactitol")
>
>
> Class<-c("aminos","aminos","aminos","aminos","aminos","sugars","sugars","sugars","glycerols","glycerols","sugar
> alcohols","sugar alcohols","sugar alcohols")
>
> set.seed(5)
> Ratio<-rnorm(13, 0.5, 3)
>
> df<-data.frame(Compound, Class,Ratio)
>
> library(lattice)
>
> P<-barchart(data=df,Ratio~Compound|Class)
>
> However, I would like to have the bars attached to an imaginary y=0-line so
> that they go up if Ratio>0 and down if Ratio<0.
> I saw some older entries in the mailing list supposing to use
> panel.barchart. However, I did not fully understand the usage of this
> function. Also, it was annouced to add an option to "barchart" to make it
> easier to get this type of plot.
>
> Has anyone an idea what the easiest solution might be?
>
> A second problem is concerning the display of the "Compound"-objects in
> accordance with the conditioning variable "Class". In other words: Is it
> possible to use the whole space of each panel for only those
> "Compound"-objects which belong to the "Class" displayed in that particular
> panel? Of course, for this purpose the panels have to be "detached" to
> allow appropiate labling of the x-axis.
>
> Many thanks for your help,
>
> Henning
>
>
> --
>
>
>
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>
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