[R] Heatmap without levelplot

[Greg Snow]

The image function in base graphics does the same type of plot, just different names and structure of the data (and the documentation says that the number of breaks should be 1 more than the number of colors).

Hope this helps,

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Antje
> Sent: Tuesday, May 05, 2009 1:12 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Heatmap without levelplot
> 
> Hi there,
> 
> as I'm not sure to understand the coloring levelplot uses, I'm looking
> for
> another easy way to create a heatmap like this:
> 
> library(lattice)
> mat <- matrix(seq(1,5, length.out = 12), nrow = 3)
> mat[1,2] <- 3.5
> 
> my.at <- seq(0.5,5.5, length.out = 6)
> my.col.regions <- rainbow(5)
> 
> graph <- levelplot(t(mat[nrow(mat):1, ] ), at = my.at, col.regions =
> my.col.regions)
> print(graph)
> 
> Can anybody help me with some hints or little examples?
> 
> Antje
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-
> guide.html
> and provide commented, minimal, self-contained, reproducible code.