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Hello Shiliang, please have a look a the manual page for image (access from R by typing "?image" ). You can specify which colors to use and at which values to switch colors using the arguments breaks and colors. For example: image(matrix(rnorm(36),4,9)+20,col=c("red","blue"),breaks=c(-1e5,20,1e 5)) basically says: display every cell with a value below 20 in red (breaks[1:2] specify the interval for "red") and every value above 20 in blue (breaks[2:3] specify the interval for "blue"). Regards, Joern swang wrote: > Dear Lists: > > I had a matrix which has lrt score for my microarray data. I just wonder > how to visualize them with score over 20 in particular color such as blue. > I cannot understand the color relationship with the value in z matrix. For > example, If I see a red color in my image generated by image function. I > don't know what is the value of z in that spot. > Example: > aaa <- matrix(rnorm(36),4,9) > image(aaa) > > Can I paint the cells at which their values are higher than a certain value > in image()? > Or I have to use some other functions, > > best > > Shiliang > > [[alternative HTML version deleted]] > > _______________________________________________ > Bioconductor mailing list > Bioconductor at stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/bioconductor > Search the archives: http://news.gmane.org/gmane.science.biology.informatics.conductor >