R - gplots - Removing white space in heatmap.2 when key=FALSE

Question

I have:

library(gplots);
x<-matrix(seq(1:100),nrow=10,byrow=TRUE);
heatmap.2(x, Rowv=NA, Colv=NA, scale="none", main="This title will be cut off by the white space where the non-existant key is supposed to go.", col=gray((255:0)/255), dendrogram="none",trace="none", key=FALSE);

When the key is specified as FALSE, there's a block of white-space on the left side of the plot that prevents the full title from showing up, conflicts with manual specification of smaller margins, and moves the heat-map toward the right. The width of the white-space is controllable using "keysize=#", but making it too small (somewhere between 0.8 and 1.0) creates an error: "Error in plot.new() : figure margins too large"

I would try doing this with heatmap() instead of heatmap.2(), but heatmap doesn't play well with par() which I need for a project. If anyone has any suggestions, I'd appreciate it.

Answer 1

Positioning elements of the heatmap.2 plot can be done using the layout parameter(s).

layout(mat = lmat, widths = lwid, heights = lhei)

I get a pretty acceptable heatmap plot using the following.

heatmap.2(x, 
    Rowv=NA, 
    Colv=NA, 
    scale="none", 
    main="This title will be cut off by the white space where the non-existant key is supposed to go.", 
    col=gray((255:0)/255), 
    dendrogram="none",
    trace="none", 
    key=FALSE, 
    lmat=rbind(c(2),c(3),c(1),c(4)), 
    lhei=c(1,1,9,0), 
    lwid=c(1)
    );

Please refer to ?layout or this answer on Stack Exchange for more details.