Hello,

I have a data frame which looks like

> head(d)
  a1 a2        n  j     col
1  1  1 88341002 11 #E7E7E7
2  1  2 25094882 11 #E7E7E7
3  1  3 16916246 11 #E7E7E7
4  1  4 14289229 11 #E7E7E7
5  1  5 11945929 11 #E7E7E7
6  1  6  8401235 11 #E7E7E7

The values in 'j' run from 1 to 11. I would like to plot the point (a1,a2)
with color given by j

I tried

 mi <- image(d[,"a1"],d[,"a2"],d[,"j"],col=mycols(length(f)),useRaster=TRUE)

(where mycols is from colorRampPalette(c("#000000","#FFFFFF"),bias=1.5)

However, i got the following error:

Error in image.default(d[, "a1"], d[, "a2"], d[, "j"], col =
mycols(length(f)),  :
  increasing 'x' and 'y' values expected


What am i doing wrong here? I have a million points and so would like to
write to a png or jpeg file.

Thanks much
H

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