How can I apply two gradients to a heat map based on a categorical variable?
Hi! I am trying to make a heat map of a continuous function for 8 different trials to visualize variability between the trials. Within each trial, there are 2 categorical variables, SS and DS. I would like to make a heat map with these values (see image), but I am unsure about how to create two different gradients. I would like to make the gradient for SS in shades of blue, but the gradient for DS...