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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