search for: mapalette

...o visualize a matrix of values between -1 and 3. How can I set the colors so that white is zero, below zero is blue of increasing intensity towards -1 and above zero is red of increasing intensity towards red? I tried like this (using the marray and gplots packages from bioconductor): mcol <- maPalette(low="blue", mid="white", high="red",k=100) heatmap.2(my_matrix, col=mcol) But white does not correspond to zero, because the value distribution is not symmetrical, so that zero is not in the middle. Is it somehow possible to create a color palette with white centered...

I'm working on some heatmaps, and the person I'm working with would prefer a red-black-green color palette (red denoting gene induction and green denoting gene repression). Does such a palette exist already? If not, is there an easy way to create one? Thanks, Jake

...one lable for all the different factor level combinations, which results in 28 labels. Maybe you have an idea how to setup the command to align the tick marks properly. thanks for your help, kind regards, Arne Here are my commands: > library(marrayPlots) # for the colors > col <- maPalette(low='white', high='darkred', k=50) > par(ps=8, cex=1, mar=c(1,5,5,1)) # space needed for lables @ axis 1 and 3 # x and y range from 1 to 84, x is the correlation matrix (dim = 84x84) > image(1:84, 1:84, x, col=col, xaxt='n', yaxt='n', xlab='', ylab=...

I would like to organize my data as follows: I have a table that contains various data, and the numbers represent a level of similarity between these data, eg RF00013 has 100% similarity with the data RF00014. I would leave my table as a heatmap where darker colors represent higher similarity, and the lighter colors represent less level of similarity. I'm using version 2.11 of R. these