ggplot with geom_tile

Dear Saskia,

Thank you for the reproducible example, that helps a lot. I pasted you
code into R and got a perfectly fine image. You need to provide us with
your sessionInfo(). Mine is listed at the end of the mail. I seem to
remember having this problem with R 2.12. Therefore updating R might be
a good option.

hope this helps,
Paul

sessionInfo()

R version 2.13.0
(2011-04-13)                                                                                       

Platform: i686-pc-linux-gnu
(32-bit)                                                                                

                                                                                                                    

locale:                                                                                                             

 [1] LC_CTYPE=en_US.utf8      
LC_NUMERIC=C                                                                         

 [3] LC_TIME=en_US.utf8       
LC_COLLATE=en_US.utf8                                                                

 [5] LC_MONETARY=C            
LC_MESSAGES=en_US.utf8                                                               

 [7] LC_PAPER=en_US.utf8      
LC_NAME=C                                                                            

 [9] LC_ADDRESS=C             
LC_TELEPHONE=C                                                                       

[11] LC_MEASUREMENT=en_US.utf8
LC_IDENTIFICATION=C                                                                  

                                                                                                                    

attached base
packages:                                                                                             

[1] grid      stats     graphics  grDevices utils     datasets 
methods                                             
[8]
base                                                                                                            

                                                                                                                    

other attached
packages:                                                                                            

[1] ggplot2_0.8.9  proto_0.3-9.2  reshape_0.8.4  plyr_1.6      
fortunes_1.4-2                                      
                                                                                                                    

loaded via a namespace (and not
attached):                                                                          

[1]
digest_0.5.1

Dear R-users,
 
I am trying to make a plot with ggplot-geom_tile(), but cannot remove some unwanted (white) lines through my plot. 
 
Below a reproducible example: 
 
#####
library(ggplot2)
tot=as.data.frame(rep(seq(-50,50,5),each=21))
names(tot)="precip"
temp=rep(seq(-5,5,0.5),21)
tot$temp=temp
 
disc=array(dim=c(21,21))  
  for(i in 1:21){
    for(y in 1:21){
temp<- rev(seq(10000+((i-1)*500),12000+((i-1)*500),100))
disc[i,y]=temp[y]
  }}
  
disc1=t(disc)
bla=as.vector(disc1)
tot$dis=bla
 
cols=c("darkred"," white"," darkblue")
 
p <- ggplot(tot, aes(x=temp, y=precip,group=dis))
p+geom_tile(aes(fill=dis)) + scale_fill_gradientn(colours=cols)
###
 
This creates the plot that I want, but with white horizontal and vertical lines that I do not need. I have tried different things, but have not found the solution. Can you help me with this problem?
 
Kind regards,
 
Saskia van Pelt

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Paul Hiemstra, Ph.D.
Global Climate Division
Royal Netherlands Meteorological Institute (KNMI)
Wilhelminalaan 10 | 3732 GK | De Bilt | Kamer B 3.39
P.O. Box 201 | 3730 AE | De Bilt
tel: +31 30 2206 494

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