Can you use a colorbar to display what number of a for loop you're on?

[poster]

I'm plotting the eigenvalues of a matrix, as I change a value inside that matrix using a linearly spaced vector from 0 to 10. What I'd like to do is use a colorbar to track what number of the for loop I'm on. That is, I'd like when i = 1 for the colorbar to be red, and have the point plotted be red, and when i = length(K), I'd like the colorbar to be green, and have the point plotted be green. Is there a way to do this? I've looked at the help docs for colorbar and I can't make heads or tails of it.

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