search for: zmax1

...nce the value at sig[1,3] == 1. This is my first foray into ggplot2, and so far the googles hasn't helped me determine if this is possible. Thanks, Eric PS, my attempt to stretch the color scale such that (-1 * zmin) = zmax = max(abs(m1)) has failed (i.e., ..., autoscale = FALSE, zmin = -1 * zmax1, zmax = zmax1), any pointers on this would greatly appreciated as well. # Import packages library(ggplot2) library(RColorBrewer) library(reshape2) m1 <- matrix(c( -0.0024, -0.0031, -0.0021, -0.0034, -0.0060, -1.00e-02, -8.47e-03, -0.0117, -0.0075, -0.0043, -0.0026, -0.0021, -0.0015, -0.0076, -...

...pprecaite the guidance Eik, that works great! I'm also wondering if you have any pointers for how I might stretch the color scale so that the max and min values are the same? Right now, the min is -0.064 and the max is something closer to 0.04. As you can see in what I sent, I tried adding: zmax1 = max(abs(m1)) ggplot(..., autoscale = FALSE, zmin = -1 * zmax1, zmax = zmax1) + ... to ggplot, but I'm either using the wrong arguments or have not added them to the correct spot. I haven't been able to find the fix for this and would very much appreciate any further guidance you can of...

Hi Eric, you can use an annotate-layer, eg ind<-which(sig>0,arr.ind = T) ggplot(m1.melted, aes(x = Month, y = Site, fill = Concentration), autoscale = FALSE, zmin = -1 * zmax1, zmax = zmax1) + geom_tile() + coord_equal() + scale_fill_gradient2(low = "darkred", mid = "white", high = "darkblue", midpoint = 0) +annotate("rect",ymin=ind[,"row"]-.5,ymax...