[R] Use new_scale_xxx() function to add the same scale type in different ggplot layers

Zhenguo Zhang’s Blog /2025/05/10/r-use-new-scale-xxx-function-to-add-the-same-scale-type-in-different-ggplot-layers/ -

In one ggplot figure, normally you can only use one scale for each aesthetic mapping. For example, if you use scale_color_manual() …