I have a large matrix. In the 3rd column, I have my "eta" values. In my 4th column, I have "r" values. In my 8th column, I have "g" values.
Eta is the same as you go down column for a while. How can I plot g vs. r as long as eta is the same, then make a new plot with g vs r anytime eta changes?
Maybe the matrix needs to be reshaped first? Note that the number of eta values that are the same can change.