Making heat map- How do I define the values for each color in the gradient?
So I am making a heat map, and my color gradient goes from green, to black in the center, to red. I would like to customize my gradient so that the black extends from exactly -1 to +1. My data set range is -2 (green) to 7 (red). So with me wanting the black area to extend from -1 to +1, this makes the gradient lopsided with the red area being much longer, which is fine. But since it is lopsided to...