How to force the x-axis tick marks to appear at the end of bar in heatmap graph?

ggplot2, r

Solution

What about this?

object = qplot(x=x, y=y, 
      fill=fill, 
      data=df, 
      geom="tile")+  
      scale_x_continuous(breaks=seq(1:3))

object + scale_x_continuous(breaks=seq(.5,3.5,1), labels=0:3)

Problem

I created a simple heatmap graph with ggplot2 but I need to force the x-axis tick marks to appear at the end of my x variable, rather than at its center. For example, I would expect 1 to appear at the position of where 1.5 is now. I beleive a heatmap done in Base R would do that. ``` library(car) #initialize libraries library(ggplot2) #initialize libraries library(reshape) df=read.table(text= "x y fill 1 1 B 2 1 A 3 1 B 1 2 A 2 2 C 3 2 A ", header=TRUE, sep="" ) #plot data qplot(x=x, y=y, fill=fill, data=df, geom="tile")+ scale_x_continuous(breaks=seq(1:3) ) ``` The idea is to create a simple heatmap which looks like this: The tick marks in this graph are placed at the end of the bars instead of their centers

Original source