[R] Adding Scale to image

[Vladimir Eremeev]

Dr. med. Peter Robinson wrote:
> 
> I have used the image() function to show a heat plot of a matrix of data 
> whose intensity  is color-coded. I have two questions that I have not 
> been able to solve by using the help system or google.
> 
> 1) How can one add a scale/legend that shows what numerical values a 
> given color corresponds to?
> 
by plotting one more sequence of points
For example

layout(matrix(c(1,2)),heights=c(0.9,0.1))
image( blah blah blah )
plot.new()
plot.window(xlim=c(0,100),ylim=c(0,1))
points(x=0:100,y=rep(1,101),col=heat.colors(101),pch=15,cex=2)


Dr. med. Peter Robinson wrote:
> 
> 2) How can one "flip" the rows (i.e., change the order of the rows in 
> the image plot)?
> 

By flipping the source matrix, displayed with "image"

image(matrix.result[nrow(matrix.result):1,])
-- 
View this message in context: http://www.nabble.com/-R--Adding-Scale-to-image-tf3142258.html#a8709150
Sent from the R help mailing list archive at Nabble.com.