[R] ggplot2 customizing a plot

[Ista Zahn]

Hi,

On Wed, Feb 20, 2013 at 9:33 AM, Alaios <alaios at yahoo.com> wrote:
> Dear all,
> I want some help improve my ggplot as following:
> Make the plottable area with grid, so is easy one to see where each box refers to x and y values.

I don't think you can easily move the grid to the front, but you can
make the tiles transparent so the grid can be seen through them by
setting the alpha < 1.

> Add a color bar but with fixed values, that I want to specify.

use scale_fill_manual

> How   I can do those two?

p<- ggplot(tdm, aes(x = Var2, y = Var1, fill = factor(value))) +
  labs(x = "MHz", y = "Threshold", fill = "Duty Cycle") +
  geom_raster(alpha=.5) +
  scale_fill_manual(values=c("red", "blue", "green", "purple",
"orange", "pink", "tan", "violet", "yellow"))


Best,
Ista


>
> Before is some code what I have tried so far.
>
> Regards
> Alex
>
>
> DataToPlot<-matrix(data=seq(1:9),nrow=3,dimnames=list(seq(1,3),seq(4,6)))
>
>
> require(reshape)
> require(ggplot2)
> require(raster)
>
>  tdm <- melt(DataToPlot)
>
>
>
> p<- ggplot(tdm, aes(x = Var2, y = Var1, fill = factor(value))) +
>             labs(x = "MHz", y = "Threshold", fill = "Duty Cycle") +
>             geom_raster() +
>             scale_fill_discrete()
>
>         [[alternative HTML version deleted]]
>
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>