-----Original Message-----
From: alaios at yahoo.com
Sent: Thu, 14 Feb 2013 07:15:05 -0800 (PST)
To: r-help at r-project.org
Subject: [R] Plot a Matrix as an Image with ggplot
Dear all,
I am trying to plot a matrix I have? as an image
str(matrixToPlot)
?num [1:21, 1:66] 0 0 0 0 0 0 0 0 0 0 .
?that contains only 0s and 1s,
where the xlabel will be Labeled as
str(xLabel)
?num [1:66] 1e+09 1e+09 1e+09 1e+09 1e+09 ...
and the yLabels will be labeled as
str(yLabel)
?num [1:21] -88 -87 -86 -85 -84 -83 -82 -81 -80 -79 ...
I have found on the internet that I can do something like that with
ggplot2.
For example
you can run the following
library(reshape2)library(ggplot2)m
=matrix(rnorm(20),5)ggplot(melt(m),aes(Var1,Var2,fill=value))+geom_raster()
What I see missing here is to get my matrix and transform it to a data
frame with labels for x and y axis so as ggplot can print the values
nice. If you get the idea this matrix will be printed as a two tile
pattern let's say with black tiles zeros and white tiles black where a
color bar will depicting that black means zero and white one.
To help you with my code you will find attached the three items I have
discussed here, the matrix, the x and the y labels.
Could you please help me with that?
Alex