Hello.

I would like to know how to set the image() function so that it assigns 
colors 
relative to an absolute scale, as opposed to relative to the values 
present 
in a particular call to image(). 

For example: 

m <- matrix(1:18,3,6)

par(mfrow = c(2,1))
image(1:6, 1:3, t(m), col = rainbow(20))
image(1:6, 1:3, t(m+9), col = rainbow(20))

Then the two images are identical.  But the right half of the first matrix 

coincides (numerically) with the left half of the second.   (i.e. compare 
'm' and 'm+9'.)

So the question is: how can image() (or some other function) assign the 
same color to every incidence of any given value across repeated calls 
to image()?

Thanks in advance.

JH


 
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