Hello,

I must start by saying that I am an R novice and am sorry if this is a no-brainer...

I have an csv file that contains a grid of 300x300 data points. Each point represents
a 1Km square on a map. Each point is either a floating point number or NA. I load the
data in with:

  data <- read.csv("matrix.csv", sep=',')

Convert the data to a matrix with:

  data_matrix <- data.matrix(data) 

and then produce the heatmap with:

  data_heatmap <- heatmap(data_matrix,Rowv=NA,Colv='Rowv',margin=c(0,0))

The heatmap is displayed in a separate window as expected and looks correct apart 
from fine white banding lines spaced out evenly over the image running horizontally 
across the image?

At first I thought it was my data but I checked that and its not. If I resize the
image I then see white vertical lines and different horizontal lines appear?

I've tried a number of different settings but can't seem to get rid of these lines.
If I can get rid of them the image will be ideal and just what I want. Does anyone
have any idea of what I'm doing wrong?

Best regards,
Col.
	[[alternative HTML version deleted]]

